Software Engineer / Developer (Java Kafka API) London / WFH to £90k

Are you a Java technologist seeking a role where you can work on ground breaking technology, continually learning and progressing your career?

You could be joining a global technology consultancy.

What’s in it for you:

Salary to £90k

Hybrid working (x2 days WFH per week)

Pension, Life Assurance, Income Protection

Private medical care for you and your family, including mental health

Travel Insurance

Charitable giving

Gym membership for you and your family

Flexible holiday scheme

Your role:

As a Software Engineer you will design, develop and deliver a range of transformational projects for clients, mainly within the financial services sector and with a focus on Kafka messaging, migrating legacy systems to AWS and introducing CI/CD pipelines and cloud deployments.

You’ll join a collaborative team with a focus on engineering best practice and continuous improvement of client systems; you will have lots of business and client exposure and continual learning and development opportunities.

Location / WFH:

There’s a hybrid work from home policy with three days a week in the London, City office (or at client sites), you’ll join a friendly, diverse, upbeat team.

About you :

You have Java development skills including multi-threading and concurrency

You have experience with Spring Boot and microservices environments

You have experience with Kafka (or similar messaging tools)

You have a good knowledge of REST APIs

You have a good understanding of AWS

You have a thorough understanding of software development and Computer Science fundamentals such as Object Oriented Programming, Data Structures and Design Patterns

You are familiar with DevOps, CI/CD pipelines

You’re collaborative, enjoy problem solving and interacting with clients

Apply now to find out more about this Software Engineer / Developer (Java Kafka Spring Boot AWS microservices) opportunity.

At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We’re an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.

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Job Description About Us Visa is a world leader in payments technology, facilitating transactions between consumers, merchants, financial institutions and government entities across more than 200 countries and territories, dedicated to uplifting everyone, everywhere by being the best way to pay and be paid. At Visa, you'll have the opportunity to create impact at scale - tackling meaningful challenges, growing your skills and seeing your contributions impact lives around the world. Join Visa and do work that matters - to you, to your community, and to the world. Progress starts with you. Job Description At Featurespace (a Visa company), we strive to be the world's best software company at protecting our clients and their customers from fraud attacks and fighting financial crime. We do that with personality, heart and professionalism-cultivating an innovative, fun and positive team atmosphere where everybody can contribute to solving our clients' problems in new, innovative ways. The Opportunity As a Site Reliability Engineer (Cloud Ops), you will help operate and continuously improve Featurespace's worldleading product, ARIC Risk Hub, delivered as a robust cloudbased SaaS solution. You will work as part of the Cloud Operations / SRE team to ensure our platform is reliable, scalable, measurable, repeatable, secure, and costeffective. You will participate in designing, developing, deploying, monitoring, supporting, documenting, and troubleshooting our SaaS platform, collaborating closely with engineering, data science, internal stakeholders, external vendors, and customers to deliver excellent service outcomes. Responsibilities We hire people with a willingness to adapt to a variable role. Along with the responsibilities below, we ask for ownership of any other duties as required. Operate and support production deployments of ARIC Risk Hub SaaS, including deploying, maintaining, monitoring, upgrading, and troubleshooting platform and application components. Build software and systems to manage platform infrastructure and applications. Continuously evaluate and improve technology and operational processes to increase quality, reduce costs, and improve timetomarket. Participate in service resilience and failure testing, including predictable and unpredictable failure scenarios. Provide secondline operational support for SaaS customers, ensuring timely and highquality issue resolution. Gather service performance data and generate reports and insights to guide reliability and scalability improvements. Develop, maintain, and document internal processes and operational runbooks. Collaborate with engineering and data science teams to drive new and improved ARIC Risk Hub capabilities. Participate in an oncall roster, including outofhours support as required. This is a hybrid position. Expectation of days in office will be confirmed by your Hiring Manager. Qualifications Core Skills Experience administering cloud infrastructure or supporting cloud applications (preferably AWS). Working knowledge of Linux, shell scripting, and commandline tools. Ability to write or maintain code in at least one highlevel programming language (e.g., Python). Understanding of networking fundamentals (e.g., DNS, routing, firewalls). Familiarity with source control systems (e.g., Git). Exposure to CI/CD concepts and pipelines. Familiarity with monitoring, metrics, and alerting systems. Experience operating and supporting productiongrade services. Ability to write clear technical documentation and follow defined operational processes. Preferred Infrastructure as Code and configuration management experience (e.g., Terraform, SaltStack, Ansible). Experience with containerization (Docker) and Kubernetes (deploying or operating services). Exposure to service mesh technologies (e.g., Istio). Experience building or operating cloudnative or serverless applications. Familiarity with observability and data platforms such as Prometheus, Grafana, MongoDB, Elasticsearch, Kafka, and HashiCorp Vault. Understanding of application and data security fundamentals (authentication, authorization, encryption, TLS). Awareness of regulated standards (e.g., PCIDSS, SOC2, ISO27001). Qualifications Relevant industry experience supporting cloudbased SaaS platforms in production environments. Excellent interpersonal and communication skills, with the ability to collaborate across teams and organizations. Strong attention to detail and a proactive, bestpracticedriven approach to work. Passion for learning new skills and technologies and staying current with industry developments. Curiosity, innovation, and enthusiasm for solving complex problems. Strong timemanagement skills and the ability to prioritize effectively. Visa is an EEO Employer Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability or protected veteran status. Visa will also consider for employment qualified applicants with criminal histories in a manner consistent with EEOC guidelines and applicable local law.

Lead Test Engineer Certain Advantage are hiring for a highly skilled Lead Test Engineer to join a major digital trans-formation programme. You will play a key role in defining and embedding a scalable, automation-first test strategy across multiple delivery teams, supporting the transition from monolithic systems to modern microservices architecture. Your responsibilities: Define and implement an end-to-end test strategy aligned to microservices architecture
Establish standards, patterns, and best practices across multiple teams
Assess current testing approaches and drive continuous improvement Embed testing strategy across teams, creating scalable frameworks and exemplars
Design, build, and maintain automated test frameworks
Work across different test levels: unit, integration, contract, system, and E2E
Lead automation efforts in Java-based environments
Support teams with implementation, not just direction
Partner with engineering teams and stakeholders to ensure alignment
Provide technical leadership and coaching to testers and developers
Ensure testing practices are consistently applied across teams The individual: Hands-on automation experience using: Java, Selenium, Rest Assured, API, contract, and integration testing
Experience working with monolith and microservices systems
Knowledge of:CI/CD pipelines, Spring Boot-based applications, Performance testing fundamentals
Contract testing, API testing, and asynchronous messaging (e.g. Kafka) Non-functional testing (performance, accessibility)
Experience with non-relational databases (e.g. MongoDB)
Automation-first mindset with ability to build reusable, maintainable frameworks Does this sound like your next career move? Apply today. Working with Certain Advantage
We go the extra mile to find the best people for the job. If you’re hunting for a role where you can make an impact and grow your career, we’ll work with you to find it. We work with businesses across the UK to find the best people in Finance, Marketing, IT and Engineering. If this job isn’t for you, head to (url removed) and register for job alerts and career guidance tips

Full Stack Engineer / Developer (C# .Net Core JavaScript AWS) St Albans / WFH to £100k

Opportunity to progress your career in a hands-on role at a technology driven trading company that invest in Sports betting markets, with a flat structure where you will get your voice heard and can make a real impact on the bottom line, earning significant bonuses.

What’s in it for you:

As a Full Stack Engineer / Developer you will earn a competitive package:

• Salary to £100k
• Bonus
• 25 days holiday, rising to 30 after 2 years
• Enhanced parental leave
• Contributory pension scheme
• Private Medical
• MSDN subscription
• Discounts for gym membership, travel and cinema
• Sabbatical after 10 years of service
• Flexible working with 2 days work from home per week in a hybrid model

Your role:

As a Full Stack Engineer you’ll join an Agile development team to design and develop new features and enhancements to complex Payments and client systems within a microservices environment (300 services). You’ll be working with a modern tech stack using C# .Net Core, AWS, Kubernetes, Kafka, Redis and TypeScript / Angular; using the right tool for the job, you’ll be able to pick up new technologies and make recommendations for improvements.

Location / WFH:

You’ll join colleagues in St. Albans, Hertfordshire (parking available), 10 minute walk from local station, with the flexibility to work from home twice a week.

About you:

• You have strong C# .Net Core backend development skills
• You have JavaScript experience, combined with Angular or React
• You have experience with AWS and microservices
• You have a thorough understanding of Computer Science fundamentals such as OOP, Design Patterns, Data Structures, Algorithms
• You enjoy collaborating, learning new things and sharing knowledge
• You are degree educated in Computer Science or closely related discipline

Apply now to find out more about this Full Stack Engineer / Developer (C# .Net Core JavaScript) opportunity.

At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We’re an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.

Job Title: IBM Maximo Application Suite (MAS) Infrastructure Specialist Location Flexible / Hybrid / On‑site (depending on project requirements) Role The IBM MAS Infrastructure Specialist is responsible for the design, installation, configuration, and ongoing management of IBM Maximo Application Suite (MAS) across on‑premise, bare metal and cloud environments. This role focuses on the underlying platform and infrastructure, ensuring MAS is deployed securely, performs optimally, and aligns with enterprise architecture and operational requirements. The specialist will work closely with application consultants, cloud teams, security teams, and client stakeholders to deliver reliable and scalable MAS environments. Key Responsibilities IBM MAS & Platform Deployment \* Install, configure, and upgrade IBM Maximo Application Suite components, including but not limited to: Maximo Manage Monitor Health Visual Inspection Assist IoT integrations \* Perform MAS installations using IBM Red Hat OpenShift on: On‑premise infrastructure Public cloud (Azure, AWS, IBM Cloud) Hybrid environments Bare Metal \* Manage MAS lifecycle operations including patching, upgrades, and version alignment. OpenShift & Container Platform Management \* Deploy and administer Red Hat OpenShift clusters for MAS workloads. \* Configure: Persistent storage (block/file/object) Networking and ingress Service mesh and routing \* Troubleshoot cluster health, performance, and capacity issues. Infrastructure & Cloud Engineering \* Design target architectures for MAS based on: High availability Scalability Disaster recovery \* Provision infrastructure using: VMware / bare metal (on‑prem) Cloud-native services (IaaS / PaaS) \* Collaborate with cloud landing zone and networking teams. Security & Compliance \* Implement security best practices, including: TLS and certificate management Identity integration (LDAP, SSO, IAM) Secrets management \* Ensure MAS deployments comply with enterprise security and governance standards. Operations & Support \* Provide 2nd/3rd line support for MAS infrastructure issues. \* Monitor system performance, logs, and alerts. \* Document environments, installation procedures, and operational runbooks. \* Support DevOps and CI/CD pipelines where applicable. Required Technical Skills & Experience Core Technologies \* Proven experience installing and managing IBM Maximo Application Suite \* Strong expertise with Red Hat OpenShift, Single Node OpenShift and Kubernetes \* Experience with containerized enterprise applications Infrastructure Skills \* On‑premise platforms: VMware vSphere Storage and networking concepts \* Cloud platforms (one or more): Microsoft Azure Amazon Web Services (AWS) IBM Cloud \* Load balancers, DNS, firewalls, and ingress controllers Operating Systems & Middleware \* Red Hat Enterprise Linux (RHEL) \* Experience with: IBM Db2, Oracle & MS SQL Server Kafka (as used within MAS) Object storage (S3-compatible) Automation & Tooling \* Infrastructure as Code (Terraform, Ansible – desirable) \* CI/CD pipelines (Git-based tooling) \* Monitoring and logging platforms \* MAS Ansible and CLI Desirable Skills & Certifications IBM Maximo or MAS certification Red Hat OpenShift certification (e.g. DO280, DO380) Cloud certifications (Azure / AWS) Experience in asset management, utilities, transport, or manufacturing sectors DevSecOps or SRE experience Soft Skills & Competencies Strong troubleshooting and analytical skills Ability to work independently and as part of a multi‑disciplinary team Clear documentation and communication skills Comfortable working with clients and project stakeholders Organized, detail‑oriented, and delivery‑focused

SOLACE MESSAGING ADMINISTRATOR - LONDON

KEY POINTS

• Salary up to £130,000 + Bonus
• 4 days per week onsite in Canary Wharf
• Supporting critical enterprise Solace messaging systems
• Opportunity to work within a low latency, high throughput trading environment

ABOUT THE CLIENT

We’re supporting a globally recognised financial services and technology organisation operating at the forefront of electronic trading and market infrastructure. Due to continued growth within their Messaging team, they’re looking to appoint an experienced Solace Messaging Administrator to help support and optimise a critical low latency messaging environment.

You’ll be joining a highly technical, collaborative team responsible for delivering resilient, high throughput messaging systems that underpin pricing, trading, and other mission critical applications across a complex global infrastructure.

THE BENEFITS

• Competitive bonus structure
• Exposure to enterprise-scale messaging infrastructure
• Opportunity to develop automation and programming skills
• Work within a highly collaborative engineering environment
• Access to modern observability and monitoring tooling
• Long-term progression opportunities within infrastructure and messaging engineering

THE SOLACE MESSAGING ADMINISTRATOR ROLE:

As a Solace Messaging Administrator, you’ll be responsible for administering and supporting enterprise Solace PubSub+ infrastructure across production and non-production environments. You’ll work closely with infrastructure, development, and support teams to ensure messaging reliability, scalability, and performance across mission critical systems.

You’ll play a key role in incident response, monitoring, capacity planning, WAN optimisation, and automation while helping maintain a highly available messaging platform supporting real-time trading and financial applications.

SOLACE MESSAGING ADMINISTRATOR ESSENTIAL SKILLS

• Experience administrating critical Solace messaging systems
• Strong background supporting enterprise production environments
• Experience with Solace PubSub+ appliances and software brokers
• Strong understanding of distributed systems and WAN environments
• Experience with Prometheus and Grafana monitoring tools
• Linux/Unix administration and scripting experience
• Strong troubleshooting and analytical problem-solving skills
• Experience supporting low latency, high throughput messaging systems

TO BE CONSIDERED:

Please either apply through this advert or email me directly via

For further information please call me on / .

By applying for this role, you give express consent for us to process and submit (subject to required skills) your application to our client in conjunction with this vacancy only.

KEY SKILLS

Solace, PubSub+, Messaging Administrator, Linux, Prometheus, Grafana, WAN, Low Latency Systems, Distributed Systems, Python, Bash, Infrastructure, Production Support, Kafka, RabbitMQ, Docker, Kubernetes, AWS, Azure, Messaging Systems

DevSecOps Engineer Hybrid - 3 days a week Due to the nature the Company and work must be eligible for UK Security Clearance (SC)

We are working with a leading UK technology and engineering organisation at the forefront of national security, defence, and advanced innovation. They deliver mission-critical solutions that give customers a decisive information advantage in complex, high-stakes environments.

They are now seeking a DevSecOps Engineer to join a specialist team tackling some of the most challenging problems in modern technology spanning across cloud, security, automation, and AI/ML operations.

You’ll operate at the intersection of cloud engineering, cyber security, and reliability, working on problems such as:

• Securely updating deployed systems in sensitive environments
• Scaling and maintaining resilient platforms under operational pressure
• Applying DevSecOps and SRE principles to mission-critical systems

Required responsibilities

• Drive end-to-end DevSecOps best practice across the SDLC
• Design and implement CI/CD pipelines and deployment automation
• Apply Site Reliability Engineering (SRE) principles to improve system uptime and performance
• Support live operational systems, troubleshooting and resolving issues
• Collaborate across engineering, security, and product teams to deliver secure, high-quality solutions
• Act as a technical leader and mentor, helping teams adopt modern DevSecOps approaches

Key skills required

Cloud Platforms: Strong experience with AWS (primary), with exposure to Azure and/or GCP

DevSecOps & Automation: End-to-end ownership of CI/CD pipelines (GitLab or similar), Infrastructure as Code (Terraform, Ansible, Puppet), and Linux-based scripting

Security Engineering: Hands-on with vulnerability management (e.g. Tenable), IAM (Azure AD, Keycloak), secure networking (certificates, tokens), and code scanning (e.g. SonarQube)

Containerisation & Orchestration: Solid experience with Docker/Podman and Kubernetes, with exposure to GPU/container workloads (desirable)

Architecture & Integration: Experience designing microservices, serverless, and edge architectures, with strong capability across APIs (REST/gRPC) and event-driven systems (Kafka, MQTT)

Observability & SRE: Familiar with Prometheus, Grafana, Elastic, applying SRE principles to improve system reliability, uptime, and performance

Programming & Automation: Ability to script and automate using Python (or similar languages such as Rust)

Role Title: Senior Database Administrator (Terraform & DevOps Focus)

Duration: contract to run until 31/08/2026

Location: Manchester, Hybrid 1 day per month. The client may ask to visit Coventry’s office at Birmingham in future for only 1 day per month depending on the business needs

Rate: up to 441.60 p/d Umbrella inside IR35

Role purpose / summary

We are seeking a hands-on Senior Database Administrator with immediate production experience in PostgreSQL (Essential), MySQL, and MongoDB, alongside strong Terraform and DevOps practices. This is a delivery-critical role-ideal for a candidate who thrives in fast-paced environments and can own database infrastructure end-to-end, from provisioning to CI/CD integration.

This role is not suitable for upskilling or learning; we require proven expertise in cloud-based database administration, automation, and infrastructure-as-code.

Key Responsibilities

Database Administration:

• Own installation, upgrades, performance tuning, troubleshooting, and disaster recovery for PostgreSQL, MySQL, and MongoDB.
• Design and execute database maintenance plans and housekeeping to ensure optimal performance and reliability.
• Implement backup, recovery, security, and access control strategies.
• Demonstrate mid to expert-level knowledge of both RDBMS and NoSQL systems.

Cloud & Infrastructure:

• Deliver production-grade database solutions in cloud based environments.
• Automate database provisioning, scaling, and management using Terraform (non-negotiable).
• Collaborate with DevOps teams to integrate database operations into CI/CD pipelines.

DevOps & Automation:

• Compose Terraform configurations from infrastructure to Git pipelines.
• Work within CI/CD pipelines (GitLab or GitHub) to deploy and manage database changes.
• Ensure Git best practices for version control, collaboration, and pipeline setup.

Required Skills & Experience

• Proven production DBA experience in cloud-based environments.
• Hands-on expertise in PostgreSQL (Essential), MySQL, and MongoDB.
• Strong performance tuning and troubleshooting skills.
• Terraform proficiency is mandatory; ability to design, deploy, and manage database infrastructure using Infrastructure-as-Code (IaC).
• Experience working within CI/CD pipelines and DevOps practices.
• Familiarity with GitLab or GitHub and pipeline setup.

Nice to Have

• Experience with JSON/XML data formats.
• Exposure and some experience to Oracle databases.
• Familiarity with Kafka or event-driven architectures.
• Experience in Agile/DevOps-driven environments.

All profiles will be reviewed against the required skills and experience. Due to the high number of applications we will only be able to respond to successful applicants in the first instance. We thank you for your interest and the time taken to apply!

Principal Java Engineer (AWS/Microservices)
Salary: Up to £100,000 + Bonus + Benefits
Location: Coventry or Central London - Hybrid (2 days per week onsite)
Working Hours: 40 hours per week - Full time
Job Type: Permanent

A globally established organisation is seeking an experienced Principal Java Engineer to shape the future of large-scale digital platforms used by millions of customers.

This role will focus on driving engineering excellence, defining technical standards and leading the design of scalable, high-availability systems across a modern cloud-native environment.

Responsibilities for the Principal Java Engineer:

• Define and evolve engineering strategy, standards and best practices across your domain
• Lead technical direction across multiple engineering teams and programmes
• Design and oversee delivery of large-scale, distributed systems using modern technologies
• Provide expert guidance on technical risk, architecture decisions and prioritisation
• Support Staff Engineers and development teams with deep technical leadership
• Drive adoption of DevOps, CI/CD, automation and modern engineering practices
• Leverage AI and intelligent automation to improve productivity and delivery outcomes
• Mentor engineers and contribute to a strong engineering culture and community of practice
• Work closely with senior stakeholders to align technology with business goals

Essential Skills for the Principal Java Engineer:

• Deep hands-on expertise in Java, Spring Boot, Microservices, Kafka and AWS
• Strong understanding of software architecture and scalable system design
• Experience leading development of high-performance distributed systems
• Proven experience in a Principal, Lead or Senior Engineering role
• Experience defining and governing technical standards and engineering practices
• Experience influencing strategy across multiple teams or domains
• Practical experience using Generative AI tools to improve engineering productivity
• Strong leadership, mentoring and stakeholder engagement skills

Desirable Skills for the Principal Java Engineer:

• Strong advocate of Agile delivery and modern engineering ways of working
• Experience building collaborative engineering communities
• Comfortable making data-driven technical decisions at scale
• Experience working closely with senior engineering leadership teams

If you are a senior Java engineering leader looking to shape modern platforms at scale while remaining close to technology, this role offers strong influence, complex challenges and long-term impact.

Principal .NET Engineer (Azure/Microservices)
Salary: Up to £100,000 + Bonus + Benefits
Location: Coventry or Central London - Hybrid (2 days per week onsite)
Working Hours: 40 hours per week - Full time
Job Type: Permanent

A globally established organisation is seeking an experienced Principal .NET Engineer to shape the future of enterprise technology used by millions of customers.

This role will focus on engineering leadership, modern architecture, cloud-native delivery and driving best practice across multiple teams within a high-scale digital environment.

Responsibilities for the Principal .NET Engineer:

• Define and evolve engineering strategy, standards and best practices across your domain
• Lead technical direction across multiple engineering teams and programmes
• Design and oversee delivery of large-scale, high-availability systems using modern Microsoft technologies
• Provide expert guidance on technical risk, architecture decisions and prioritisation
• Support Staff Engineers and delivery teams through hands-on technical leadership
• Drive adoption of DevOps, CI/CD, automation and modern engineering practices
• Champion secure-by-design principles, vulnerability management and risk reduction
• Implement observability frameworks including monitoring, logging and SLO/SLI practices
• Leverage AI and intelligent automation to improve productivity and delivery outcomes
• Mentor engineers and strengthen engineering culture across the organisation

Essential Skills for the Principal .NET Engineer:

• Deep hands-on expertise in ASP.NET Core, Web API, C#, Entity Framework
• Strong experience with Azure, Kubernetes, Kafka and Microservices architecture
• Experience with MongoDB, cloud integrations and distributed systems
• Strong knowledge of JavaScript/TypeScript
• Experience using Terraform/Infrastructure as Code
• Strong understanding of software architecture and scalable system design
• Experience leading development of complex, high-performance platforms
• Proven experience in a Principal, Lead or Senior Engineering role
• Practical experience using Generative AI tools to improve engineering productivity

Desirable Skills for the Principal .NET Engineer:

• Strong advocate of Agile delivery and modern engineering ways of working
• Experience building collaborative engineering communities
• Comfortable making data-driven technical decisions at scale
• Strong mentoring background across engineers of all levels
• Passion for innovation and continuous improvement

If you are a senior .NET engineering leader looking to shape modern cloud platforms at scale while remaining close to technology, this role offers strong influence, complex delivery challenges and long-term impact.

About the Role:

• We are hiring a Java Backend Developer to join a leading banking client in the UK. The role involves building and modernizing scalable backend systems, working on microservices architecture, and contributing to high-performance, secure financial applications.

Key Responsibilities:

• Design and develop backend services using Java and Spring Boot
• Build and enhance microservices-based applications
• Develop and integrate REST APIs for enterprise systems
• Work on event-driven architecture using messaging tools (e.g., Kafka)
• Collaborate with cross-functional teams in an Agile environment
• Support CI/CD pipelines, deployments, and production releases
• Ensure high performance, scalability, and reliability of applications

Required Skills:

• Strong experience in Java (8/11/17) and Spring Boot
• Hands-on experience with Microservices architecture
• Experience with REST APIs and backend development
• Exposure to event-driven systems / Kafka (or similar tools)
• Experience with databases (SQL/NoSQL)
• Familiarity with CI/CD tools and containerization (Docker)
• Experience working in Agile environments

Domain Experience:

• Prior experience in Banking / Financial Services is preferred.

Solutions Architect - London Job Title: Solutions Architect Salary: Paying up to £85,000 per annum Location: Wembley London - 5 days on-site Are you a hands-on technical leader with a passion for creating innovative technology solutions? Our client, a well-established and diversified multinational organisation, is seeking a Solutions Architect to join their team. Skills Experience: Solution Architecture with a clear focus on E-commerce platforms or API/Middleware ecosystems.
Technical Stack: Expert-level knowledge of Node.js, Java (Spring Boot), and PostgreSQL - able to read and critique vendor code, not just high-level diagrams.
Integration Expert: Deep proficiency in API management patterns, Webhook integrations, and Event-Driven Architecture using Kafka or Azure Event Hubs.
Legacy-to-Cloud: Demonstrable experience migrating legacy monolithic systems into containerised microservices architectures.
Tooling: Proficient in Visio or LucidChart for architectural modelling; disciplined in Confluence for documentation practices.Duties Blueprint Delivery: Develop high-quality High-Level Designs (HLDs) and Low-Level Designs (LLDs) for DTS, EPOS, and other strategic workstreams - to a standard that external vendors are contractually required to match.
Vendor Governance: Conduct structured audits of vendor-submitted code and architecture. Enforce ‘Stable-by-Design’ framework, ensuring external deliverables meet internal quality, security, and scalability thresholds.
Data Integration Leadership: Orchestrate complex data mapping between legacy IBM iSeries (DB2/RPG) systems and modern API middleware - a technically demanding challenge requiring deep integration expertise.
Systemic Remediation: Lead deep-dive investigations into recurring platform failures error surges, latency anomalies, and data inconsistencies - and deliver long-term structural remediation, not tactical patches.
Technical Documentation: Maintain high-quality architecture documentation in Confluence, ensuring designs are versioned, accessible, and transferable to operational teams

Job Title: Senior PostgreSQL DBA
Location: Manchester/Birmingham- once a month in the office
Salary/Rate: £500 per day inside IR35
Start Date: 18/05/2026
Job Type: Contract

Company Introduction
We have an exciting opportunity now available with one of our sector-leading banking clients! They are currently looking for a skilled Senior PostgreSQL DBA to join their team for a six-month contract.

Job Responsibilities/Objectives

We are seeking a hands-on Senior Database Administrator with immediate production experience in PostgreSQL (Essential), MySQL, and MongoDB, alongside strong Terraform and DevOps practices. This is a delivery-critical role-ideal for a candidate who thrives in fast-paced environments and can own database infrastructure end-to-end, from provisioning to CI/CD integration.

This role is not suitable for upskilling or learning; we require proven expertise in cloud-based database administration, automation, and infrastructure-as-code.

Database Administration:

• Own installation, upgrades, performance tuning, troubleshooting, and disaster recovery for PostgreSQL, MySQL, and MongoDB.
• Design and execute database maintenance plans and housekeeping to ensure optimal performance and reliability.
• Implement backup, recovery, security, and access control strategies.
• Demonstrate mid to expert-level knowledge of both RDBMS and NoSQL systems.

Cloud & Infrastructure:

• Deliver production-grade database solutions in cloud based environments.
• Automate database provisioning, scaling, and management using Terraform (non-negotiable).
• Collaborate with DevOps teams to integrate database operations into CI/CD pipelines.

DevOps & Automation:

• Compose Terraform configurations from infrastructure to Git pipelines.
• Work within CI/CD pipelines (GitLab or GitHub) to deploy and manage database changes.
• Ensure Git best practices for version control, collaboration, and pipeline setup.

Required Skills/Experience
The ideal candidate will have the following:

• Proven production DBA experience in cloud-based environments.
• Hands-on expertise in PostgreSQL (Essential), MySQL, and MongoDB.
• Strong performance tuning and troubleshooting skills.
• Terraform proficiency is mandatory; ability to design, deploy, and manage database infrastructure using Infrastructure-as-Code (IaC).
• Experience working within CI/CD pipelines and DevOps practices.
• Familiarity with GitLab or GitHub and pipeline setup.

Desirable Skills/Experience
Although not essential, the following skills are desired by the client:

• Experience with JSON/XML data formats.
• Exposure and some experience to Oracle databases.
• Familiarity with Kafka or event-driven architectures.
• Experience in Agile/DevOps-driven environments.

If you are interested in this opportunity, please apply now with your updated CV in Microsoft Word/PDF format.

Disclaimer
Notwithstanding any guidelines given to level of experience sought, we will consider candidates from outside this range if they can demonstrate the necessary competencies.
Square One is acting as both an employment agency and an employment business, and is an equal opportunities recruitment business. Square One embraces diversity and will treat everyone equally. Please see our website for our full diversity statement.

£60,000 - £85,000 DOE Southampton - Hybrid Security Clearable \*Are you a software engineer who wants your work to genuinely matter?\* We're looking for a passionate software engineer to join a high-performing team tackling some of the most technically demanding challenges in the defence sector. This isn't about maintaining Legacy systems or shipping incremental updates - it's about building cutting-edge capability that operates at the edge, in the field, and under pressure. The Role You'll be part of a team delivering software solutions that leverage the latest in machine learning, edge compute, and DevOps automation. Think rapid capability deployment, deployed hardware environments, sensors, and robotics - the kind of engineering problems that push you to grow. You'll own code releases and deployments, support operational systems, and collaborate across disciplines to drive agile best practice into real-world solutions. What You'll Be Doing You'll work closely with product owners and fellow engineers across the full delivery life cycle - from architecture discussions to production deployments. Day to day, that means contributing to agile ceremonies (Scrum, Kanban or SAFe), participating in code reviews, working with quality engineers to uphold high standards, and troubleshooting operational systems when it counts. This is a collaborative, technically ambitious environment where your voice matters and your ideas get heard. What We're Looking For You'll have a degree in a STEM subject, or equivalent practical experience. Beyond that, we're interested in engineers who are curious, proactive, and genuinely energised by solving hard problems. You'll be familiar with some combination of the following - we don't expect expertise across everything, but we do want depth in some areas and a hunger to learn the rest. \*Languages:\* Python, Java, Rust, or JavaScript \*Cloud:\* AWS (primary), with Azure or GCP experience a bonus \*Containerisation & Virtualisation:\* Docker or Podman, Kubernetes, and ideally some exposure to GPU containerisation (NVIDIA Container Toolkit, Run:AI) \*Architecture:\* Microservices, serverless, edge compute, RESTful APIs, Protobuf/gRPC, and stream-based pub/sub systems including Kafka and MQTT \*DevSecOps:\* Git, CI/CD pipelines (eg GitLab), Infrastructure as Code (Terraform, Puppet, Ansible), and Linux Shell Scripting As important as the technical profile is the person behind it. You'll communicate clearly with colleagues at all levels, thrive in a team, and take ownership of your work with a solutions-first mindset. What's on Offer Alongside a competitive salary, you'll have access to a flexible benefits package spanning health and wellbeing, financial protection, and lifestyle perks. You'll join a genuinely inclusive organisation that invests in its people and its technology in equal measure - having doubled in size over the last four years, the growth here is real and the opportunities that come with it are too. There's also a thriving internal community of technical groups where engineers come together around shared interests, tools, and ideas. It's the kind of place where intellectual curiosity is encouraged, not just tolerated. \*This role requires the ability to obtain UK Security Clearance.\ If you're ready to work on problems that matter, with people who take pride in what they build, we'd love to hear from you.

Solutions Architect - London

Job Title: Solutions Architect
Salary: Paying up to £85,000 per annum

Location: Wembley London - 5 days on-site

Are you a hands-on technical leader with a passion for creating innovative technology solutions? Our client, a well-established and diversified multinational organisation, is seeking a Solutions Architect to join their team.

Skills

• Experience: Solution Architecture with a clear focus on E-commerce platforms or API/Middleware ecosystems.
• Technical Stack: Expert-level knowledge of Node.js, Java (Spring Boot), and PostgreSQL - able to read and critique vendor code, not just high-level diagrams.
• Integration Expert: Deep proficiency in API management patterns, Webhook integrations, and Event-Driven Architecture using Kafka or Azure Event Hubs.
• Legacy-to-Cloud: Demonstrable experience migrating Legacy monolithic systems into containerised microservices architectures.
• Tooling: Proficient in Visio or LucidChart for architectural modelling; disciplined in Confluence for documentation practices.

Duties

• Blueprint Delivery: Develop high-quality High-Level Designs (HLDs) and Low-Level Designs (LLDs) for DTS, EPOS, and other strategic workstreams - to a standard that external vendors are contractually required to match.
• Vendor Governance: Conduct structured audits of vendor-submitted code and architecture. Enforce ‘Stable-by-Design’ framework, ensuring external deliverables meet internal quality, security, and scalability thresholds.
• Data Integration Leadership: Orchestrate complex data mapping between Legacy IBM iSeries (DB2/RPG) systems and modern API Middleware - a technically demanding challenge requiring deep integration expertise.
• Systemic Remediation: Lead deep-dive investigations into recurring platform failures error surges, latency anomalies, and data inconsistencies - and deliver long-term structural remediation, not tactical patches.
• Technical Documentation: Maintain high-quality architecture documentation in Confluence, ensuring designs are versioned, accessible, and transferable to operational teams.

• Salary to £70k + Company Options Scheme • Hybrid working between your home, their offices (London Vauxhall) & client sites. NB: Please only apply if you are a UK National and able to achieve SC (ideally DV) clearance i.e. you have at least 5 years residency in the UK with no more than a 3 month break outside the UK. This company is a Workflow & AI Orchestration Specialist. They're on a mission to modernise how public sector organisations manage casework, derive insight from data and deliver citizen services. They’re growing fast and looking for bright, dynamic people to help build their business. Role They’re looking for an experienced (Principle/Team Lead) Java Engineer to join their implementation team. You’ll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration — helping their public-sector clients build secure, scalable, and resilient digital services. You’ll collaborate with solution architects, business analysts, and designers to translate workflows into elegant, maintainable code. You’ll play a key part in defining technical standards, optimising runtime performance, and mentoring less- experienced engineers in workflow-centric delivery. This is an ideal role for someone who enjoys solving complex process problems through clean code, automation, and modern engineering practices. The role involves visiting client sites; the company will cover travel expenses. Frequency is uncertain but candidates should be comfortable with that being 2-3 days per week. Client sites could be anywhere but will most likely be in & around London. Responsibilities Design, develop, and deploy Camunda-based process and decision automation solutions Implement and integrate Java-based microservices, APIs, and connectors within orchestration flows Translate BPMN and DMN models into executable workflows and reusable components Collaborate closely with analysts and service designers to refine and iterate business processes Develop and maintain automated test suites, CI/CD pipelines, and containerised deployments Optimise Camunda engine performance and monitor workflow metrics for production environments Participate in code reviews, peer testing, and technical design discussions Contribute to their internal best-practice frameworks and automation accelerators Essential Eligible (have resided in the UK for the past 5 years) and prepared to go through UK SC Security Clearance Strong experience in Java software engineering and object-oriented design Strong Spring (Boot) experience Experience with REST APIs, and microservice architectures Knowledge of Docker and Kubernetes for containerisation and orchestration Proficiency in Git, CI/CD pipelines, and automated testing frameworks Understanding of event-driven design and message brokers (e.g. Kafka, RabbitMQ) Good knowledge of security, authentication, and integration patterns for enterprise systems Experience working in agile teams within digital transformation or automation programmes A willingness to learn BPMN and Camunda tooling Some exposure to process automation or microservice orchestration Desirable Experience with Camunda 8 (Zeebe) clusters and Operate/Tasklist components Experience implementing solutions using Camunda 7 or 8 (BPMN/DMN) Familiarity with Camunda connectors, external task workers, and scripting extensions Exposure to cloud platforms (AWS, Azure, GCP) and infrastructure-as-code (Terraform, Helm) Experience integrating process automation with case-management or service-orchestration platforms Understanding of agentic AI capabilities and how they can complement workflow automation Experience mentoring developers or contributing to open-source Camunda extensions Already holding UK security clearance (SC, DV, eDV) Other Stuff NB: Please only apply if you are a UK National and able to achieve SC or DV clearance. i.e. you have at least 5 years residency in the UK with no more than a 3 month break outside the UK. NB: for non-UK Citizens; we cannot accept applications from anyone requiring sponsorship (now or in the future) for UK permanent employment status. If you are utilising a work visa this must allow you to work in the UK unrestricted for at least the next 5 years. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid lead senior manager manage

Prestigious opportunity for a talented and experienced Senior Java Developer to join a fast growing technology and transformation team delivering innovative, large-scale engineering solutions.This role sits at the intersection of technology, data, and AI, working on some of the UK’s most ambitious digital programmes. You’ll play a key role in designing and building modern, scalable applications that help organisations make smarter, data driven decisions.Collaborating within mature, cross-functional teams, working alongside engineers, architects, and business stakeholders to create impactful, future ready solutions.
Key Responsibilities

• Design, develop, and maintain high-quality Java based applications
• Contribute across the full software development lifecycle
• Provide technical input into architecture and system design
• Build secure, scalable RESTful APIs
• Collaborate with engineers, product teams, and stakeholders to deliver solutions
• Write clean, maintainable, and well documented code
• Troubleshoot and resolve complex production issues
• Continuously improve system performance, reliability, and security
• Stay up to date with emerging technologies and best practices

If you possess a combination of some of the following skills, then LET’S TALK!

• Strong experience in Java development (plus exposure to Kotlin or Scala)
• Deep understanding of OOP principles, SOLID design, and design patterns
• Hands on experience with Spring Framework (Spring Boot, Spring MVC)
• Experience designing and securing RESTful APIs
• Experience with containerisation (Docker, Kubernetes)
• Familiarity with CI/CD tools (Jenkins, GitHub Actions, Bit bucket Pipelines)
• Strong experience with Git and version control strategies
• Experience working with cloud platforms (AWS, Azure, or GCP)
• Ability to monitor, diagnose, and improve application performance
• Strong understanding of secure coding practices

Exposure to the following would be advantageous but not essential: -

• Messaging/streaming technologies (Kafka, SQS)
• Serverless technologies (e.g., AWS Lambda)
• Monitoring/logging tools (ELK, Splunk, Dynatrace)
• ORM technologies (JPA, Hibernate)
• API documentation tools (e.g., Swagger/OpenAPI)
• Test tools (Postman, Selenium, Axe)
• Exposure to AI-assisted development tools (e.g., GitHub Copilot)

In return, you will be rewarded with a market leading benefits package and ongoing career development in a flexible, hybrid working environment.

What you need to do now

If you’re interested in this role, click ‘apply now’ to forward an up-to-date copy of your CV, or call us now.
If this job isn’t quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

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60,000 - 85,000 DOE Southampton - Hybrid Security Clearable Are you a software engineer who wants your work to genuinely matter? We're looking for a passionate software engineer to join a high-performing team tackling some of the most technically demanding challenges in the defence sector. This isn't about maintaining legacy systems or shipping incremental updates - it's about building cutting-edge capability that operates at the edge, in the field, and under pressure. The Role You'll be part of a team delivering software solutions that leverage the latest in machine learning, edge compute, and DevOps automation. Think rapid capability deployment, deployed hardware environments, sensors, and robotics - the kind of engineering problems that push you to grow. You'll own code releases and deployments, support operational systems, and collaborate across disciplines to drive agile best practice into real-world solutions. What You'll Be Doing You'll work closely with product owners and fellow engineers across the full delivery lifecycle - from architecture discussions to production deployments. Day to day, that means contributing to agile ceremonies (Scrum, Kanban or SAFe), participating in code reviews, working with quality engineers to uphold high standards, and troubleshooting operational systems when it counts. This is a collaborative, technically ambitious environment where your voice matters and your ideas get heard. What We're Looking For You'll have a degree in a STEM subject, or equivalent practical experience. Beyond that, we're interested in engineers who are curious, proactive, and genuinely energised by solving hard problems. You'll be familiar with some combination of the following - we don't expect expertise across everything, but we do want depth in some areas and a hunger to learn the rest. Languages: Python, Java, Rust, or JavaScript Cloud: AWS (primary), with Azure or GCP experience a bonus Containerisation & Virtualisation: Docker or Podman, Kubernetes, and ideally some exposure to GPU containerisation (NVIDIA Container Toolkit, Run:AI) Architecture: Microservices, serverless, edge compute, RESTful APIs, Protobuf/gRPC, and stream-based pub/sub systems including Kafka and MQTT DevSecOps: Git, CI/CD pipelines (e.g. GitLab), Infrastructure as Code (Terraform, Puppet, Ansible), and Linux shell scripting As important as the technical profile is the person behind it. You'll communicate clearly with colleagues at all levels, thrive in a team, and take ownership of your work with a solutions-first mindset. What's on Offer Alongside a competitive salary, you'll have access to a flexible benefits package spanning health and wellbeing, financial protection, and lifestyle perks. You'll join a genuinely inclusive organisation that invests in its people and its technology in equal measure - having doubled in size over the last four years, the growth here is real and the opportunities that come with it are too. There's also a thriving internal community of technical groups where engineers come together around shared interests, tools, and ideas. It's the kind of place where intellectual curiosity is encouraged, not just tolerated. This role requires the ability to obtain UK Security Clearance. If you're ready to work on problems that matter, with people who take pride in what they build, we'd love to hear from you.

Watford, Hertfordshire (Hybrid)

£70,000 - £75,000 per annum + Excellent benefits

On behalf of an industry Leading organisation, I am seeking a Senior Python Software Engineer with strong production experience building high-throughput, message-driven platforms. This role suits someone comfortable working on real-world, always-on systems where reliability, performance, and clear engineering judgement matter as much as clean code.

The business is pleased to offer this role on a hybrid basis with a non-negotiable 3 days in office; therefore, you must be within easy reach of their Watford-based offices.

Responsibilities:

• Collaborate closely with Principal Engineers.
• Provide technical guidance, insight, and mentorship to other engineers.
• Participate in peer reviews and offer constructive feedback.
• Support product stakeholders in shaping the roadmap.
• Contribute to best practices and engineering standards across the wider engineering organization.
• Participate in modern software development practices including pairing, code reviews, documentation reviews, testing, and continuous delivery.
• Translate requirements into implementable technical specifications and tasks.
• Maintain accurate and reliable technical documentation.
• Provide regular updates on progress, timelines, risks, and dependencies.
• Lead troubleshooting and incident resolution, including occasional out-of-hours support.
• Ensure unit tests are implemented and fit for purpose.
• Research and evaluate new technologies that could benefit the organisation.
• Design and develop high-quality Python software that meets complex business needs.
• Ensure code, documentation, and testing align with engineering standards.
• Deliver solutions that meet acceptance criteria, performance expectations, and operational reliability.
• Integrate products with monitoring and support tooling.

Experience/Skills required:

• Experienced Senior Engineer who can make sound trade-offs, design for scale, and contribute to complex systems without over-engineering.
• Strong engineering judgement and real-world delivery experience.
• Senior-level experience designing and building production Back End services in Python (3.10+).
• Strong background in high-throughput, message-based or event-driven systems.
• Proven experience building API-first services, with a focus on performance, reliability, and maintainability.
• Python Back End development, primarily using FastAPI and modern API patterns.
• Strong understanding of RESTful API design, schema validation, and OpenAPI/Swagger.
• Experience working with messaging and eventing platforms such as Kafka, RabbitMQ, Azure Service Bus, MQTT, or similar.
• Cloud-native development experience is essential (ideally on Azure).
• Hands-on experience with containerisation (Docker) and orchestration platforms such as Kubernetes.
• Exposure to building and supporting shared or internal libraries used across multiple services.

Hampshire/Hybrid - 2 days per week onsite
£60,000 - 65,000 per annum
SC cleared

The Opportunity
Help deliver cutting-edge software solutions. You’ll work on complex, real-world challenges using modern technologies like machine learning, edge computing, and DevOps automation to accelerate capability deployment.

The Role
You’ll contribute to the development, release, and support of operational systems, with opportunities to expand into sensors and robotics. This is a collaborative role requiring strong technical expertise and effective communication across teams.

What You’ll Bring

1. Degree in a STEM subject or equivalent experience
2. Experience with some of the following:
3. Languages: Python, Java, Rust, JavaScript
4. Cloud: AWS (Azure/GCP beneficial)
5. Containers: Docker, Kubernetes, GPU containerisation
6. Architecture: Microservices, serverless, APIs, edge compute, pub/sub systems (Kafka, MQTT)
7. DevSecOps: Git, CI/CD, Terraform/Ansible, Linux Scripting
8. Proactive mindset, strong problem-solving skills, and ability to work independently or in teams

Key Responsibilities

1. Deliver software with product owners and engineering teams
2. Contribute to Agile processes (Scrum, Kanban, SAFe)
3. Ensure quality through testing and code reviews
4. Support and troubleshoot live systems

If this Software Engineer role is of interest, apply now or email me at (see below)

Solutions Architect - London

Job Title: Solutions Architect
Salary: Paying up to £85,000 per annum

Location: Wembley London - 5 days on-site

Are you a hands-on technical leader with a passion for creating innovative technology solutions? Our client, a well-established and diversified multinational organisation, is seeking a Solutions Architect to join their team.

Skills

• Experience: Solution Architecture with a clear focus on E-commerce platforms or API/Middleware ecosystems.
• Technical Stack: Expert-level knowledge of Node.js, Java (Spring Boot), and PostgreSQL - able to read and critique vendor code, not just high-level diagrams.
• Integration Expert: Deep proficiency in API management patterns, Webhook integrations, and Event-Driven Architecture using Kafka or Azure Event Hubs.
• Legacy-to-Cloud: Demonstrable experience migrating Legacy monolithic systems into containerised microservices architectures.
• Tooling: Proficient in Visio or LucidChart for architectural modelling; disciplined in Confluence for documentation practices.

Duties

• Blueprint Delivery: Develop high-quality High-Level Designs (HLDs) and Low-Level Designs (LLDs) for DTS, EPOS, and other strategic workstreams - to a standard that external vendors are contractually required to match.
• Vendor Governance: Conduct structured audits of vendor-submitted code and architecture. Enforce ‘Stable-by-Design’ framework, ensuring external deliverables meet internal quality, security, and scalability thresholds.
• Data Integration Leadership: Orchestrate complex data mapping between Legacy IBM iSeries (DB2/RPG) systems and modern API Middleware - a technically demanding challenge requiring deep integration expertise.
• Systemic Remediation: Lead deep-dive investigations into recurring platform failures error surges, latency anomalies, and data inconsistencies - and deliver long-term structural remediation, not tactical patches.
• Technical Documentation: Maintain high-quality architecture documentation in Confluence, ensuring designs are versioned, accessible, and transferable to operational teams.