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Discover the latest RESTful jobs on Haystack, your go-to IT job board for top developer roles. Whether you’re a skilled RESTful API developer or looking to specialize in REST architecture, explore exciting opportunities with leading tech companies. Start your next career move today and find RESTful jobs that match your skills and ambitions.

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Umbraco Developer

Rise Technical Recruitment

Spalding, Lincolnshire (Office-based) Competitive Salary DOE + Holiday + PensionThis is an excellent opportunity for an experienced and highly proficient Umbraco Developer to join a business at an exciting time of growth. This role offers a varied and interesting position where you will have freedom to work on bespoke projects.This company is a digital transformation company specialising in bespoke software development, legacy system support, and enterprise applications for a diverse range of clients.In this varied role you will design, develop, and maintain Umbraco-based web applications, implement clean and scalable code using .NET and C#, integrate REST APIs, while contributing to planning and code reviews, and ensure adherence to security standards using Git-based workflows and CI/CD.The ideal candidate will have previous commercial Umbraco CMS experience (including custom back-end development), strong proficiency in .NET (C#) MVC and a solid awareness of secure coding standards. Experience with SQL databases, RESTful services and Git is also required.This is a fantastic opportunity for an Umbraco Developer looking for a role that will involve a variety of different tasks and brings the opportunity to work within a business that heavily invests in training for its staff.The Role

Design and maintain Umbraco web applications and services.

Implement secure and scalable code.

Ensure security by adhering to security standards.

Use Git workflows and CI/CD in an agile environment.

The Person

Previous commercial experience with Umbraco CMS (custom back-end).

Strong proficiency in .NET (C#) MVC and modern development.

Experience with SQL, REST APIs, Git, ADO, and quality tools like SonarQube.

Able to commute to Spalding 5 days a week.

Reference Number: BBBH(phone number removed)To apply for this role or for to be considered for further roles, please click “Apply Now” or contact Tom McLaughlin at Rise Technical RecruitmentThis vacancy is being advertised by Rise Technical Recruitment Ltd. The services of Rise Technical Recruitment Ltd are that of an Employment AgencyRise Technical Recruitment Ltd regrets to inform that our client can only accept applications from engineering candidates who have a valid legal permit or right to work in the United Kingdom. Potential candidates who do not have this right or permit, or are pending an application to obtain this right or permit should not apply as your details will not be processed.

Umbraco Developer - Contract

Rise Technical Recruitment

Umbraco Developer 3 Month Contract Outside IR35 Spalding, Lincolnshire (2 days on-site) Competitive Salary + ASAP Start + Outside IR35This is an excellent opportunity for an experienced and highly proficient Umbraco Developer to join a business at an exciting time of growth. This role offers a varied and interesting position where you will have freedom to work on bespoke projects.This company is a digital transformation company specialising in bespoke software development, legacy system support, and enterprise applications for a diverse range of clients.In this varied role you will design, develop, and maintain Umbraco-based web applications, implement clean and scalable code using .NET and C#, integrate REST APIs, while contributing to planning and code reviews, and ensure adherence to security standards using Git-based workflows and CI/CD.The ideal candidate will have previous commercial Umbraco CMS experience (including custom back-end development), strong proficiency in .NET (C#) MVC and a solid awareness of secure coding standards. Experience with SQL databases, RESTful services and Git is also required.This is a fantastic opportunity for an Umbraco Developer looking for a role that will involve a variety of different tasks and brings the opportunity to work within a business that heavily invests in training for its staff.The Role

Design and maintain Umbraco web applications and services.

Implement secure and scalable code.

Ensure security by adhering to security standards.

Use Git workflows and CI/CD in an agile environment.

The Person

Previous commercial experience with Umbraco CMS (custom back-end).

Strong proficiency in .NET (C#) MVC and modern development.

Experience with SQL, REST APIs, Git, ADO, and quality tools like SonarQube.

2 days a week on-site

Outside IR35 Contract with immediate start.

Backend Software Engineer TypeScript Node AWS

Backend Software Engineer / Developer (TypeScript Node AWS) Remote to £85kAre you a backend focussed Software Engineer looking for an opportunity to progress your career, whilst working remotely on a modern tech stack?You could be joining a scaling AI software solutions provider in a senior, hands-on role.As a Backend Software Engineer you will build new features with a focus on backend services and APIs using TypeScript, Node and AWS, also with some Python work for LLM integration. You’ll take ownership of projects, working across the full development lifecycle from requirements through to delivery and help to drive the adoption of AI within the development lifecycle.Location / WFH:There’s a remote first policy so you can work from home on a fulltime basis with the caveat that you’ll meet up with the team in London once a month (expenses paid); there’s also flexible working hours (with a 10am stand-up).About you:You have strong backend software engineering skills with TypeScript and Node.jsYou have strong AWS experience including ECS, Lambda, S3, SQS and RDSYou have a good working knowledge of PythonYou have experience of building RESTful APIs and microservicesYou have a good understanding of database development on PostgreSQL and DynamoDBYou’re collaborative and pragmatic with great communication skillsWhat’s in it for you:Salary to £85kRemote working (x1 day in London a month)PensionHealthcareApply now to find out more about this Backend Software Engineer / Developer (TypeScript Node AWS) 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.TPBN1_UKTJ

SC Cleared Software Engineer (.Net)

SC Cleared .NET Software Engineer Remote (UK) - Central Government Salary: £60k per annumClearance: Active SC requiredA leading defence and security technology consultancy is seeking an SC Cleared .NET Software Engineer to support secure government projects. Known for their cutting-edge solutions and commitment to innovation, they offer a dynamic and collaborative work environment where employees can thrive.You’ll develop .NET applications, build RESTful APIs, work with Azure services, and contribute to CI/CD pipelines-all while ensuring compliance with strict security standards.Requirements:Active SC Clearance (mandatory)Strong .NET Core / .NET Framework and C# skillsExperience with RESTful APIs , OAuth/JWT , and API securityFamiliarity with Azure App Services, Functions, Storage, SQLExperience using Azure DevOps for CI/CDUnit/integration testing experience (xUnit/NUnit)Desirable:Cybersecurity knowledgeDefence/security sector experienceAgile delivery experienceIf you’re an SC Cleared .NET Engineer seeking meaningful work within national security, apply now with your updated CV .*P. S: Company cannot provide visa sponsorship, so only candidates residing in UK and with the existing right to work will be considered for the role.TPBN1_UKTJ

Senior Full Stack .NET Developer

Hays DT - South Coast

Senior Full Stack .NET Developer (Angular/React and .NET 8 Microservices) Gatwick (1-2 days per week in office) £65-75k + Benefits.Your new company This leading financial and consulting business are looking to bolster their engineering team with a Senior Full Stack .NET Developer to join their core team of 16 Devs. You will be working in their state-of-the-art offices near to Gatwick/Crawley and will be required to work 1-2 days per week in the office.Your new role This is a full-stack, full software life cycle role where Devs are encouraged to bring ideas to the table and challenge the status quo. From architecture and development through to deployment you’ll play a key role in building cutting-edge solutions by developing .NET microservices and dynamic Angular Front End applications (we can consider React cross-training to Angular).Working in a collaborative Agile environment, you’ll partner with product owners, QA engineers, and fellow developers as well as talking to the business/stakeholders to understand user requirements and will be building a slick client portal which is crucial for their customers. From sprint planning to troubleshooting complex distributed systems, you’ll ensure robust, scalable, and secure solutions. You’ll write clean, testable code, contribute to architectural decisions, and support CI/CD pipelines while monitoring production systems to keep everything running smoothly.The platform is being increasingly used and scheduled to go international as well, so the roles are extremely stable with years of work confirmed ahead. The company are investing into AI and there is progression into Senior and Lead positions to build a career in an internationally renowned business.What you’ll need to succeed We are looking for Strong experience in C# .NET, building RESTful APIs and distributed microservices. Solid understanding of SQL Server, Entity Framework Core, and data modelling.It’s a Full Stack role, so you must have proficiency with a TypeScript based framework, ideally Angular (They are up to version 20), but will happily consider React or Vue and an openness to learn Angular.We need someone who subscribes to SOLID principles, Clean Architecture, and design patterns. You will come from an Agile enivoronment pushing Scrum and will have exposure to modern DevOps tooling/practices, CI/CD pipelines and automated testing.Communication skills are paramount as you are the interface between the development team and key stakeholders in the business. Working on enterprise level financial systems will be highly beneficial.What you’ll get in return You’ll work for an internationally renowned business, one of the top 5 organisations in their sector globally and will be able to work hybrid with 2 days in the office. On top of this you’ll get 26 days holiday plus bank holidays and the option to purchase more, access to a huge catalogue of online courses for professional development, electric car scheme and healthcare support through a virtual GP. There is parking on site and the office is walking distance from the train station.What you need to do now To find out more and to be considered for this position please apply directly, or contact Max Wilcock, Senior Business Director on .At Hays Technology, we are shaping the future of recruitment. The rapid adoption of cloud, which is making customer interfaces more engaging and creating a seamless engagement with businesses, means that from the foundation of your organisation up, software developers are critical to success. As the competition for talent grows, we’re ready and waiting to help developers really make an impact on organisations, so talk to us today. We are Hays Technology.Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C’s, Privacy Policy and Disclaimers which can be found on our website.

Android Developer

LA International Computer Consultants Ltd

*REMOTE OCCASIONAL TRAVEL TO LONDON*.*INSIDE IR35*You will be part of the team that will be responsible for developing and maintaining features for the Android variant of an undisclosed App. Working in a multi-disciplinary team of tech, design, business, product, infrastructure and test, you will help to design, develop, test and deliver new features while also maintaining existing features. You will be involved throughout the entire product life cycle being chiefly responsible for producing high-quality, performant, well-documented and tested features that deliver a first-class experience to millions of users across England.Responsibilities

Work with a multi-disciplinary team to design, document and develop high quality, scalable solutions for the App’s Android application using Kotlin.

Create appropriate unit and integration tests for your work.

Write clean, maintainable and eNicient code, which follows best practices and coding standards.

Optimise solutions for performance and speed to provide an excellent user experience.

Ensure the application meets the Google Play store requirements.

Work closely with UI/UX designers to ensure the application implements a consistent visual intuitive design.

Support what you deliver in production.

The ideal candidate must:

Have 5+ years’ experience of Android development using Kotlin and Android Studio.

Be passionate about mobile development, keeping up to date with the latest Android development trends and best practices.

Have a good understanding of Android design principles and interface guidelines.

Be someone who embraces collaboration when building solutions.

Have a good understanding of MVVM Architecture and associated design patterns.

Be able to apply SOLID principles to improve the code structure, quality and maintainability.

Have a DevOps mindset, understanding how software and infrastructure work together.

Have a good understanding of continuous integration, continuous delivery and how these are implemented via the use of pipelines.

Proactively look for solutions to any issues that arise in your domain.

Have experience with troubleshooting/debugging application bugs and making performance improvements.

Have experience with using Gradle.

Have an understanding of mobile app analytics and its use to maintain stable, crash free applications.

Have knowledge of using Jetpack Compose.

Have experience with using native OS features such as push notifications, Health Connect and Intents.

Have experience of integrating with RESTful APIs.

Experience in handling concurrency (eg background tasks/network activity without blocking the UI thread)

Nice to have

Understanding the compilation process and how the code gets converted into an executable.

Knowledge or experience of using FHIR.

Understanding of good memory management practices, handling reference counting and/or garbage collection

LA International is a HMG approved ICT Recruitment and Project Solutions Consultancy, operating globally from the largest single site in the UK as an IT Consultancy or as an Employment Business & Agency depending upon the precise nature of the work, for security cleared jobs or non-clearance vacancies, LA International welcome applications from all sections of the community and from people with diverse experience and backgrounds.Award Winning LA International, winner of the Recruiter Awards for Excellence, Best IT Recruitment Company, Best Public Sector Recruitment Company and overall Gold Award winner, has now secured the most prestigious business award that any business can receive, The Queens Award for Enterprise: International Trade, for the second consecutive period.

Senior Software Engineer - .Net

I’m looking for a Senior .NET Software Engineer to work on impactful, in-house platforms with a forward-thinking engineering team. My client is an established technology-driven company based in the North West of England, and are hiring a permanent .NET developer to help drive innovation and build robust software solutions that scale.The RoleYou’ll play a key role in developing and maintaining my clients internal software platforms, working across the full development life cycle. The ideal candidate will have strong experience with Back End technologies and a proactive approach to cloud-native development.LocationThis is a remote-first role, but we’re ideally looking for someone based within a commutable distance of the North West for occasional team collaboration days.Tech Stack

C#/.NET (Core and Framework)

Azure cloud services

Kubernetes (AKS)

RESTful APIs & Microservices

SQL & NoSQL databases

CI/CD & modern DevOps practices

Experience

Solid experience in .NET software engineering (C#)

Project Lead/Team Lead experience

Strong cloud experience, ideally with Azure

Familiarity with containerisation & orchestration (Kubernetes preferred)

Good understanding of software architecture and clean code principles

Comfortable working independently and as part of a collaborative team

Experience with performance tuning and high-availability systems

Familiarity with Agile/Scrum methodologies

Benefits

£60,000-£70,000 DOE

Remote working with flexible hours

25+ days holiday + bank holidays

Private healthcare

Training & development budget

Regular team meetups & events

Guidant, Carbon60, Lorien & SRG - The Impellam Group Portfolio are acting as an Employment Business in relation to this vacancy.

Principle Software Developer

Are you ready to take the lead in shaping cutting-edge software solutions?This opportunity to join a UK-leading software house on a mission to deliver innovative, scalable, and high-performing applications, and we want YOU to be part of it.As a Principal Developer, you’ll play a fundamental role in guiding a team of six skilled developers, driving technical excellence, and influencing architectural decisions. This is your chance to work on greenfield projects that influence modern technologies and best practices, no legacy code, just fresh innovation.What You’ll DoTake ownership of technical architecture and design for new projects.Build and optimise RESTful APIs, microservices, and modular monolith architectures.Contribute to strategic technical decisions and ensure best practices across the team.Design and implement robust solutions using .NET or full-stack technologies.What We’re Looking ForStrong experience in .NET or full-stack development.Proven track record with RESTful APIs, microservices, and modular monolith design.A passion for clean, scalable code and modern software architecture.Excellent communication and leadership skills.Why Join?Work for a UK-leading organisation with a reputation for innovation.Hybrid flexibility, up to 2 days per week in the office.A supportive, collaborative environment where your ideas matter.Competitive salary and benefits package.Greenfield projects, be part of building something new from the ground up.Ready to make an impact?Apply today and help us build the future of software solutions.TPBN1_UKTJ

Fullstack Developer - SC Cleared

LA International Computer Consultants Ltd

Our client is looking for two fullstack developers to join the team. You will have experience of delivery services at scale using JavaScript/HTML, Node.js, Spring Boot, REST APIs and event driven integrations on AWS.Technical skills:

Front End: JavaScript, HTML; responsive UI patterns and web standards.

Back End: Node.js and Spring Boot microservices; RESTful API design and API management (policies, rate limiting, security), EKS (Kubernetes), Containerisation (Docker).

Proficient in Kubernetes & Containerisation of Applications

Docker

Integration: data layer integration; event driven design with Kafka; NoSQL (MongoDB/DocumentDB).

Security: IDAM/IdP, SSO, RBAC, SSL/TLS, KMS (key management and envelope encryption patterns), Graph API.

Cloud operability: telemetry and logging on AWS; performance and availability monitoring.

Tooling & delivery: Jira, Confluence, GitHub, CI/CD pipelines; automated testing and code reviews.

The role is based remotely and is inside IR35. The contract is for 3 months initially.LA International is a HMG approved ICT Recruitment and Project Solutions Consultancy, operating globally from the largest single site in the UK as an IT Consultancy or as an Employment Business & Agency depending upon the precise nature of the work, for security cleared jobs or non-clearance vacancies, LA International welcome applications from all sections of the community and from people with diverse experience and backgrounds.Award Winning LA International, winner of the Recruiter Awards for Excellence, Best IT Recruitment Company, Best Public Sector Recruitment Company and overall Gold Award winner, has now secured the most prestigious business award that any business can receive, The Queens Award for Enterprise: International Trade, for the second consecutive period.

(SC Cleared) NodeJS Developer - Inside IR35

Sanderson Recruitment

+10

Rate: Up to £500 per day Location: Hybrid - 1 day every fortnight on-site in Corsham, Wiltshire Contract: Inside IR35 Clearance: Active SC Clearance required (DV desirable)About the RoleWe’re seeking an experienced NodeJS Engineer to join a high-security Defence programme - a critical data integration platform enabling secure information sharing across Defence systems and domains.You’ll be part of a multi-disciplinary agile team responsible for developing, securing, and maintaining microservices that underpin MOD’s next-generation data fabric.Key Responsibilities

Design, develop, and maintain Node.js microservices within the LDDF architecture.

Implement secure RESTful APIs for data exchange across domains.

Ensure all services meet MOD security, logging, and auditing standards.

Work with DevOps engineers to containerise and deploy services via Kubernetes/OpenShift.

Integrate with messaging systems (e.g., Kafka, RabbitMQ, or Azure Service Bus).

Contribute to CI/CD pipelines and automated testing frameworks.

Collaborate with architects, testers, and cyber security teams to ensure compliance and resilience.

Essential Skills & ExperienceNode.js (advanced) - event-driven architecture, async programming TypeScript - strongly typed, enterprise-grade API development Express.js or NestJS - RESTful and modular service design Security-first development - OAuth2, JWT, TLS, secure logging Containerisation - Docker, Kubernetes, or OpenShift CI/CD - GitLab CI, Jenkins, or Azure DevOps pipelines Messaging / Integration - REST APIs, Kafka, RabbitMQ, or Service BusDesirable Skills

Knowledge of LDDF framework, MOD digital services, or Defence data standards

Infrastructure as Code - Terraform or Ansible

Experience with MODCloud, AWS, or Azure

Testing frameworks: Jest, Mocha, Supertest

Familiarity with JSP 440, NCSC Secure Coding Guidelines, or Defence Digital standards

Security Clearance

Active SC clearance is mandatory.

Candidates eligible for DV clearance will be prioritised for longer-term roles.

Reasonable Adjustments:Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people of all backgrounds and perspectives. Our success is driven by our people, united by the spirit of partnership to deliver the best resourcing solutions for our clients.If you need any help or adjustments during the recruitment process for any reason***,*** please let us know when you apply or talk to the recruiters directly so we can support you.

Senior Identity & Access Management Engineer Typescript, C#, AWS IAM

Smart Sourcer Limited

Senior Identity & Access Management Engineer Typescript, C#, OAuth2, AWS IAM, Zero TrustOutstanding opportunity to join this global B2B SaaS leader as a Senior Full Stack IAM Engineer, developing secure, scalable identity and access management across multiple components and geographies. This permanent role offers the chance to shape the Zero Trust authentication and authorization services in a cutting-edge, AI-driven environment.About the Role:Own the IAM platform, designing and developing integrations with OAuth providersBuild full-stack zero trust security features in TypeScript, C#, AWS IAMDeliver secure login, SSO, MFA, RBAC/ABAC, and tenant isolation at scale, leveraging AWS services (Lambda, IAM, CloudFront, API Gateway, CDK)Collaborate across Product, Security, and Engineering teams, embed identity into new features, and uphold engineering excellence through CI/CD, testing, and incident responseRequired experience:Strong full-stack development skills (TypeScript, C#, AWS)An in-depth security mindset with a thorough understanding of Zero Trust & OAuth2Proven experience with OIDC-compliant IDPs (Auth0, Okta, Cognito)Solid AWS expertise (IAM, Lambda, API Gateway, CDK)A proven background in building RESTful APIs that interact with IDPsSecurity-first mindset with experience in secure coding, threat modelling, and protecting PIIAbility to mentor, collaborate, and lead with hands-on problem-solving£85k-£90k + bonus + benefits. 95% remote & London

+11

Overview We are seeking a highly motivated and skilled Software Engineer to join our dynamic development team. This role offers the opportunity to work on innovative application development projects, utilise a wide range of programming languages and tools, and contribute to the creation of scalable, efficient software solutions. The ideal candidate will have a strong foundation in software development, excellent problem-solving abilities, and a passion for technology. This is a paid position suitable for both experienced professionals and recent graduates eager to develop their careers in software engineering.Key Responsibilities

Lead the design, deployment, and development of web-based and microservice applications using Angular, TypeScript, and .NET Core.

Architect and implement CI/CD pipelines using Azure DevOps.

Conduct code reviews and mentor junior developers.

Estimate, plan, and deliver greenfield and enhancement projects.

Support deployment and configuration of web applications on IIS.

Troubleshoot production issues and provide post-release support.

Maintain comprehensive documentation and ensure secure, scalable solutions.

Perform development and testing tasks using modern tools.

Ensure timely delivery of tasks while maintaining high quality.

Communicate effectively with internal teams and client stakeholders.

Skills and Experience Required

Bachelor s degree (or equivalent) in Computer Science, Software Engineering, or related field.

Minimum 2 3 years professional software development experience.

Strong programming skills in Java, Python, C#, JavaScript, or PHP.

Experience with frameworks such as React, Angular, Node.js, Django, or .NET.

Understanding of databases such as MySQL, PostgreSQL, or MongoDB.

Familiarity with RESTful API design.

Experience with Git version control.

Understanding of software testing methodologies and CI/CD pipelines.

Excellent problem-solving and analytical skills.

Strong attention to detail and ability to manage multiple tasks.

Please note that this will be an in-office Job at Salisbury.

dotnet developer - Bristol

Junior .Net Developer / Junior Dotnet DeveloperUmbraco or other dotnet based CMS experience highly desirableup to 35kBristol, Hybrid 2 days in office per weekBenefits:Personal development roadmap with learning allowance and certificationsGenerous holiday allowanceBirthday day offEmployee Assistance ProgramI am working with a Bristol based software agency who are looking for a Junior Software Engineer (dotnet) to join their team.Any experience that you have with .Net CMS (Sitecore, Kentico etc) is highly desirable - Umbraco in particular . You should be someone who is passionate about producing quality code using SOLID and DRY principles in an Agile environment.Their products are complex, and require innovative solutions to meet client expectation.They have absolutely no legacy code.This is a great environment to enhance the quality of your work, and you will be working alongside experienced developers who can show you the ropes.You should use SOLID design principles in your day-to-day work, and you should ideally be familiar with LINQ, design patterns, data access patterns, multithreaded applications, Web API’s and advanced SQL amongst others.You will be responsible for developing high-quality applications. You will design and implement testable and scalable code.This is a junior position, so if you don’t have everything listed but you have been working with .Net and Umbraco then I would like to hear from you. Likewise, if you are a bit more experienced then please apply to be considered.Day to day you will be working with .Net, Umbraco, Dynamics365, ASP.Net Microservices Architecture, Azure DevOpsResponsibilities:

Working on key projects within the business.

Constantly challenging, finding more innovative ways of doing things

Ensuring a high level of customer experience

Making sure that quality standards are achieved

Stakeholder Communication

Working with Azure Cloud Infrastructure

Develop quality software and web applications

Analyse and maintain existing software applications

Design highly scalable, testable code

Discover and fix programming bugs

Experience needed:Current hands on coding experience with C#, .Net, ASP.Net, MVCSOLID, DRY principlesAPI IntegrationDegree in Computer Science related subjectSQL database or relational database skillsDesirable:Umbraco (Ideally V13 +)Other .Net based CMS such as Sitecore or KenticoThis is an urgent vacancy, if you would like to be considered then apply quoting reference.Net, dotnet, ASP.Net, MVC, CMS, Umbraco, Kentico, Sitecore, SOLID, DRY, Agile, API, SOAP, Restful, LINQ, design patterns, data access patterns, multithreaded applications, Web API’s, SQL, .Net, dotnet, ASP.Net, MVC, CMS, Umbraco, Kentico, Sitecore, SOLID, DRY, Agile, API, SOAP, Restful, LINQ, design patterns, data access patterns, multithreaded applications, Web API’s, SQL, .Net, dotnet, ASP.Net, MVC, CMS, Umbraco, Kentico, Sitecore, SOLID, DRY, Agile, API, SOAP, Restful, LINQ, design patterns, data access patterns, multithreaded applications, Web API’s, SQL, .Net, dotnet, ASP.Net, MVC, CMS, Umbraco, Kentico, Sitecore, SOLID, DRY, Agile, API, SOAP, Restful, LINQ, design patterns, data access patterns, multithreaded applications, Web API’s, SQL, .Net, dotnet, ASP.Net, MVC, CMS, Umbraco, Kentico, Sitecore, SOLID, DRY, Agile, API, SOAP, Restful, LINQ, design patterns, data access patterns, multithreaded applications, Web API’s, SQLIf you are interested in this position please click ‘apply’.Hunter Selection Limited is a recruitment consultancy with offices UK wide, specialising in permanent & contract roles within Engineering & Manufacturing, IT & Digital, Science & Technology and Service & Sales sectors.Please note as we receive a high level of applications we can only respond to applicants whose skills & qualifications are suitable for this position. No terminology in this advert is intended to discriminate against any of the protected characteristics that fall under the Equality Act 2010.For the purposes of the Conduct Regulations 2003, when advertising permanent vacancies we are acting as an Employment Agency, and when advertising temporary/contract vacancies we are acting as an Employment Business.Job Tenure: Permanent Salary: £32000 - £35000 per annum + electric car scheme Location: Bristol,

Lead/Full Stack Developer - AWS,TypeScript, ReactJS, Node.js, RESTful API English Speaking

Lead/Full Stack Developer AWS,TypeScript, ReactJS, Node.js, RESTful API English SpeakingRemote workingEnglish SpeakingLead Full Stack Developer, English SpeakingSkills:? Professional experience in software development with a strong background in both Front End and Back End.? Deep expertise in TypeScript, ReactJS, Node.js, and RESTful API development.? Experience with event-driven architecture, and cloud-native development.? Strong understanding of SQL (structured query language)? Very Proficient in AWS cloud services especially Lambda, SQS, S3, Cognito, API Gateway, EventBridge, etc.? Hands-on experience with DevOps practices (eg Git)? Familiarity with Front End tooling such as ESLint, CSS-in-JS, and testing frameworks? Excellent communication and collaboration skills.? Strong leadership skills and the ability to guide teams through technical decisions.? A passion for quality, performance, and security.As a Full Stack Lead Engineer, you will be responsible for leading the design, development, and maintenance of scalable, high-performance applications across both Front End and Back End systems. You will collaborate closely with product managers, designers, and other engineers to deliver features that create exceptional user experiences. This is a hands-on role with leadership responsibilities, ideal for someone who thrives in a fast-paced environment and enjoys solving complex technical challenges. you’ll also be expected to actively explore, evaluate, and adopt the latest Generative AI tools and practices to enhance productivity, streamline workflows, and accelerate development across the engineering team.Key Responsibilities:? Lead full stack development using ReactJS, TypeScript, Node.js, and related technologies.? Architect and implement robust, scalable, and secure APIs and web applications.? Collaborate with product, design, and other teams to understand requirements and translate them into technical solutions.? Provide technical leadership and mentorship to other engineers.? Own and maintain key features across both Front End and Back End layers.? Drive and enforce coding standards, best practices, and documentation.? Identify and resolve complex performance, scalability, and reliability challenges.? Contribute to DevOps processes (CI/CD, monitoring, infrastructure) and help optimize development pipelines.? Participate in architecture discussions and influence the future direction of the platform.? Investigate and adopt new technologies (eg WASM, serverless patterns) to continually improve the platform.Flexible start date (ie immediate to 3 months notice)(If this position do not fit within your experience or is of no interest to you we offer a recommendation fee for any consultant you refer we successfully make a placement with).

Senior Android Engineer (Native Integration & Security)

Ventula Consulting Limited

We are seeking an exceptional Senior Android Engineer to join a newly-founded joint venture backed by five of the world’s leading telecommunications companies. Our mission is to restore trust in voice communication by building a network-native intelligence layer to combat the global epidemic of voice fraud and AI-driven scams.In this role, you will be the owner of our most critical, user-facing feature: the Telco-Verified Security Shield. You will be responsible for the magic moment of our product, delivering an instant, network-verified trust indicator to a user’s device in the moments before they answer the call. This is not a standard mobile app role; it is a deep, real-time systems challenge that requires you to architect and implement a high-performance, secure, and reliable solution that integrates directly with the Android operating system’s native call-handling services.Your primary objective is to own the client-side implementation of our sub-500ms Time-to-Trust (TtT) metric. You will be the driving force behind the trust in our product, working at the intersection of native mobile engineering, real-time data processing, and client-side security. This position offers a unique opportunity to build a category-defining security product from the ground up, leveraging proprietary, network-level data that no pure-OTT competitor can access.Key ResponsibilitiesNative OS Integration & Performance?Architect, build, and own the entire native call interception flow using Android’s CallScreeningService to intercept and analyze calls as they ring.?Design and engineer the high-performance Trust Indicator overlay, obsessing over every millisecond of client-side processing to ensure we meet our strict sub-500ms Time-to-Trust (TtT) metric.?Implement the client-side logic to consume and display Explainable AI reasoning (e.g., Recent SIM Swap Detected, Verified Business) provided by our backend services.?Build a robust, efficient, and scalable client-side API integration layer to consume real-time security signals (like our proprietary Scam_Score) from the AI Core.Security & Quality?Implement and champion our mandatory Zero Trust security architecture at the client level, ensuring all network data and user PII are handled with the highest level of security.?Define and enforce best practices for performance, code quality, and testing for the entire Android security stack.?Work closely with the QA Engineer to build test harnesses and instrumentation to rigorously validate the sub-500ms latency target and ensure a false-positive rate of less than 1%.Cross-functional Collaboration?Partner with the Senior Backend Engineer (Application & AI Orchestration) to define the API contracts and real-time data flow needed to power the Security Shield.?Collaborate with the UX/UI Designer to iterate on a seamless, intuitive, and trustworthy user experience for the trust indicator and its explanations.?As a foundational engineering hire, you will help define our Android engineering culture, mentor future hires, and set the standard for technical excellence.Required QualificationsEducation & Experience?Bachelor’s degree in Computer Science, Engineering, or a related field.?5+ years of hands-on experience in native Android development, with a portfolio of high-performance, public-facing applications.Required Technical & Android Skills?Expert-level, production-grade experience with native Android development (Kotlin required).?Demonstrated, deep expertise with Android’s native call-handling APIs, specifically the CallScreeningService framework. This is a critical, non-negotiable skill for this role.?Proven experience building high-performance, real-time user interfaces that are deeply integrated with the Android OS.?Strong understanding of mobile security principles and best practices, including secure data storage, network communication (mTLS), and threat modeling.?Proficiency in consuming RESTful APIs and real-time data streams (e.g., WebSockets) in a mobile environment.?Strong understanding of Android performance profiling tools and techniques to debug and optimize for latency.?Experience with multi-threaded and asynchronous programming on Android.Preferred QualificationAdvanced Education & Industry Experience?Master’s degree in Computer Science or a related field.?Previous experience in the telecommunications, cybersecurity, or anti-fraud/anti-spam industries.?Experience building applications for a global audience with localization and compliance requirements.Advanced Systems & Security Expertise?Experience with the Android NDK (C++) for performance-critical operations.?Familiarity with real-time audio processing on Android.?Deep knowledge of mobile network protocols and security.?Experience building or integrating SDKs.This is a permanent position with hybrid working of two days a week in the central London office and the rest WFH. The salary is very much dependant on experience with a guide between £110k-£150K basic + package.

Principle Software Developer

Take ownership of technical architecture and design for new projects.

Build and optimise RESTful APIs, microservices, and modular monolith architectures.

Contribute to strategic technical decisions and ensure best practices across the team.

Design and implement robust solutions using .NET or full-stack technologies.

What We’re Looking For

Strong experience in .NET or full-stack development.

Proven track record with RESTful APIs, microservices, and modular monolith design.

A passion for clean, scalable code and modern software architecture.

Excellent communication and leadership skills.

Why Join?

Work for a UK-leading organisation with a reputation for innovation.

Hybrid flexibility, up to 2 days per week in the office.

A supportive, collaborative environment where your ideas matter.

Competitive salary and benefits package.

Greenfield projects, be part of building something new from the ground up.

Ready to make an impact? Apply today and help us build the future of software solutions.

Location: London 2x a weekContract: 3 monthsRate: Competitive market rate, Outside IR35This is an excellent opportunity for an experienced ColdFusion Developer to join a leading global business that support major brands.ColdFusion Developer Responsibilities

Develop, maintain, and optimise ColdFusion/CFML applications across customer-facing and internal platforms.

Build and consume RESTful APIs to integrate with new services and modern architecture components.

Collaborate with product, engineering, and QA teams to deliver secure, scalable solutions.

Support the migration and refactoring of Legacy ColdFusion code to modern development standards.

Troubleshoot performance issues, implement fixes, and ensure best practices in coding and testing.

Contribute to documentation, code reviews, and continuous improvement initiatives.

ColdFusion Developer Requirements

Strong commercial experience with ColdFusion/CFML (Adobe ColdFusion or Lucee).

Proficient in SQL and relational databases such as MySQL, PostgreSQL, or SQL Server.

Solid understanding of REST API development, integrations, and modern application architecture.

Familiarity with JavaScript frameworks (eg, Vue.js, React) and Front End best practices.

Experience with Git, CI/CD pipelines, and automated deployment workflows.

Exposure to cloud platforms (AWS preferred) and containerisation (Docker/Kubernetes) is beneficial.

Strong debugging skills and the ability to work independently in a fast-paced environment.

If this role sounds of interest - apply today!We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age

Full Stack Software Developer React, Typescript

Spectrum It Recruitment Limited

Jnr - Mid level Full Stack Software DeveloperReact, JavaScript, TypeScript, HTML, CSSFully Remote (UK only)Human’s best friend are not all in loving homes or considered well cared for.For a multitude of reasons inside and outside of human control; dogs, cats and pets in general require veterinary intervention, care and rehousing. Step in this wonderful global charity who partner with global veterinary specialists to offer life-saving and life-improving care to animals in need. The global veterinary teams rely on technology to connect them to people, services and information.If you are passionate about animal welfare and seeking a career in software development and technology. This could be the role you are looking for.Responsibilities:Design and develop scalable back end services using Prisma ORM and SQL.Build reusable front-end components using React and Next.js.Develop robust APIs to serve both front-end and admin systems.Translate UX/UI wireframes into responsive user interfaces.Ensure data integrity, security, and system performance across the platform.Collaborate with stakeholders to define features, user stories, and technical specifications.Work independently within a remote-first team setup, delivering high-quality, maintainable code.Required Skills & Experience:Proven experience in full stack development roles.Strong proficiency in React, Next.js, and modern JavaScript/TypeScript.Solid back end experience with Prisma ORM and SQL databases.Experience designing and building RESTful APIs.Familiarity with CI/CD pipelines and Git-based work flows.Strong problem-solving and debugging skills.Ability to work autonomously and communicate effectively with remote teams.Spectrum IT Recruitment (South) Limited is acting as an Employment Agency in relation to this vacancy.TPBN1_UKTJ

Senior Backend Engineer - Systmes Design - Golang

Ventula Consulting Limited

Senior Backend EngineerWe are seeking a deeply technical and security-minded Senior Backend Engineer to join a newly-founded, high-impact AI joint venture. Backed by five of the world’s leading telecommunications giants, our mission is to restore trust in global voice communication.This is not a standard backend role. We are seeking a foundational engineer to own our single greatest strategic asset: our unique, privileged access to network-level intelligence via the GSMA CAMARA API standard. This is our right to win, and you will be the engineer responsible for building the bridge to it.You will be the Critical Path Owner for Track Zero, the 30-day foundational sprint to validate and integrate the first-ever CAMARA-based signals (like sim-swap and device-roaming-status) from our telco founders. Your success is the Go/No-Go gate for our MWC 2026 launch. You will be directly responsible for building the out-of-band data path that enables our flagship Telco-Verified Security Shield and its sub-500ms Time-to-Trust metric, our core differentiator that no over-the-top competitor can replicate.This position offers a unique opportunity to define a new category of network-aware security, working directly with the world’s leading carriers to turn their network data into a real-time defense against global fraud.Key ResponsibilitiesTelco Integration & Architecture

Own and buildthe Security Signal Ingestion path, the secure, low-latency, and out-of-band data channel connecting to our founding members’ network API gateways.

Architect and implementa carrier-agnostic, vendor-agnostic connector layer to consume RESTful APIs from a heterogeneous global landscape of telco partners and IMS vendors (e.g., Nokia, Ericsson, Mavenir).

Serve as the primary technical liaisonto the engineering teams at our telco founders (Deutsche Telekom, Singtel, SKT, etc.), working hand-in-glove to navigate, validate, and productionize their new CAMARA network APIs.

Design and buildthe high-throughput microservices that will query, ingest, normalize, and cache network signals (e.g., sim-swap, device-roaming-status) to be used in our real-time Scam_Score model.

Implementa mandatory Zero Trust security model for this critical integration, our most sensitive asset. This includes mTLS, least-privilege IAM, and network micro-segmentation.

System Ownership & Performance

Serve as the Critical Path Ownerfor Track Zero, our 30-day sprint to validate and integrate real-time signals from at least two telco partners, culminating in a Go/No-Go demo.

Ensureall network API integrations meet the stringent P99 latency budgets (e.g., < 150ms) required to support our sub-500ms Time-to-Trust product goal.

Collaboratewith the platform team to build a parallel development path using mocked data to mitigate risks of network API delays.

Define and ownthe data contracts and pipelines that feed this “ground-truth” network data from the integration layer to our core AI Service Bus (Apache Kafka).

Cross-functional Collaboration

Work closelywith the Scam Detection Service and AI/ML teams to define the feature vectors and data payloads needed from the network to power our proprietary machine learning models.

Partner with product and leadershipto define the Phase 2 (post-MWC) roadmap for co-developing new,proprietarynetwork APIs (like Caller_Velocity from CDRs) that will become our long-term, indefensible moat.

Documentintegration architectures, data schemas, and security controls to create setup guides for our Founding Member partners.

Collaboratewith our external InfoSec vendor to ensure the integration layer is continuously validated and hardened against threats.

Required QualificationsEducation & Experience

Bachelor’s degree in Computer Science, Engineering, or a related field.

7+ years of hands-on experience in backend engineering, with a proven track record of building and maintaining high-performance, distributed systems in production.

Required Technical Skills

A minimum of 5 years of production experience with C++ or Go (Golang).

Strong, demonstrable experiefnce with real-time, low-latency data processing.You obsess over milliseconds and understand the trade-offs.

Proficiency with cloud platforms(AWS, GCP, or Azure) and containerization technologies (Kubernetes, Docker).

Deep understanding of API design(REST, gRPC, Webhooks) and API security (OAuth 2.0, mTLS, JWTs).

Knowledge of (or deep, demonstrable curiosity about) telecommunications protocols and architectures.You must be comfortable talking to network engineers.

Experience with high-throughput messaging or streaming platforms(e.g., Kafka, Pulsar).

This is a permanent position with hybrid working of two days a week in the central London office and the rest WFH. The salary is very much dependant on experience with a guide between £130k-£160K basic + package.

Full Stack Software Developer React, Typescript

Spectrum IT Recruitment

Design and develop scalable back end services using Prisma ORM and SQL.

Build reusable front-end components using React and Next.js.

Develop robust APIs to serve both front-end and admin systems.

Translate UX/UI wireframes into responsive user interfaces.

Ensure data integrity, security, and system performance across the platform.

Collaborate with stakeholders to define features, user stories, and technical specifications.

Work independently within a remote-first team setup, delivering high-quality, maintainable code.

Required Skills & Experience:

Proven experience in full stack development roles.

Strong proficiency in React, Next.js, and modern JavaScript/TypeScript.

Solid back end experience with Prisma ORM and SQL databases.

Experience designing and building RESTful APIs.

Familiarity with CI/CD pipelines and Git-based work flows.

Strong problem-solving and debugging skills.

Ability to work autonomously and communicate effectively with remote teams.

Spectrum IT Recruitment (South) Limited is acting as an Employment Agency in relation to this vacancy.

Senior Full Stack Developer

City Facilities Management

JOB TITLE: Senior Full Stack Developer LOCATION: Glasgow Head Office SALARY: Competitive (depending on experience)This role will be responsible for developing and maintaining end-to-end software solutions across both front-end and back-end systems. Ensure that applications are robust, scalable, and user-focused by combining strong technical expertise with an understanding of business requirements. Contribute to architectural decisions and ensure all software adheres to architectural standards and best practices. Provide guidance and coaching to the team as required.PRINCIPAL TASKS AND RESPONSIBILITIESSoftware Development

Develop high quality technical solutions which meet specified business objectives, whilst adhering to overarching business and technical requirements and constraints.

Ensure all software that is created is in line with the technical roadmap and development guidelines.

Optimise applications for maximum performance, scalability, and security

Work with other members of the team to ensure business requirements are appropriately converted to functional and technical specifications

Troubleshoot, debug, and resolve technical issues across the full technology stack.

Conduct unit testing, participate in code reviews, and support quality assurance processes.

Participate in squad ceremonies including Story Refinement, Sprint Planning and Retrospectives.

As a Senior

Contribute the design, architecture, and planning of complex systems and applications.

Mentor, coach, and support junior and mid-level developers to build skills and improve code quality.

Identify and address technical debt, proposing long-term solutions for maintainability and performance.

Act as an escalation point for complex technical issues across the full stack.

Own and drive major features or projects from concept through delivery.

Contribute to security reviews and ensure robust security practices across applications.

Basic Behaviours

Ensure that continuous improvement is baked into everything we do.

Support the development of a strong culture focused on transparency, collaboration, and high performance

Make time to support other members of the squad and answer questions when they need help.

Take responsibility of your personal objectives and those of the squad.

Take ownership of deadlines and releases for yourself and the team.

Any quality issues of the software the squad owns should be looked on as a temporary and unacceptable state of affairs. Every opportunity should be taken to rectify problems, in conjunction with the completion of squad and individual objectives.

Specific Knowledge:

Microsoft .NET development stack (C#, ASP.NET, MVC, SQL Server)

Azure, .NET Core, Entity Framework

Angular, Typescript

GIT, Azure DevOps

RESTful Web APIs

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Frequently asked questions

What is a RESTful job?

A RESTful job involves working with REST (Representational State Transfer) APIs, which are used to design networked applications. These roles typically include developing, maintaining, and integrating RESTful web services.

What skills are required for RESTful jobs?

Key skills for RESTful jobs include proficiency in HTTP methods (GET, POST, PUT, DELETE), understanding of JSON/XML data formats, experience with API design and development, knowledge of stateless architecture, and familiarity with tools like Postman or Swagger.

Which programming languages are commonly used for RESTful development?

Common programming languages for RESTful development include JavaScript (Node.js), Python, Java, Ruby, PHP, and Go, among others. The choice depends on the project requirements and tech stack.

Are there different job roles related to RESTful APIs?

Yes, roles can vary from Backend Developer, API Developer, Software Engineer, Integration Engineer to DevOps Engineer. Each focuses on different aspects of RESTful services, such as development, testing, deployment, or integration.

How can I find RESTful jobs on Haystack?

You can search for RESTful jobs on Haystack by entering keywords like 'REST', 'RESTful API', or relevant programming languages in the job search bar. Use filters to narrow down by location, experience level, or job type.

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