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.Net Jobs in London
Overview
Looking for top .Net jobs in London? Haystack connects skilled developers with leading employers across the city’s thriving tech scene. Explore the latest .Net developer roles in London and take the next step in your career with opportunities that match your skills and ambitions. Start your search today on Haystack!
NET Developer
Avanti Recruitment
Chigwell
In office
Mid - Senior
£80,000 - £120,000
RECENTLY POSTED
+3

Location: Office-Based | UK
Industry: Financial Services

Are you a strong C# developer who enjoys working on real-world systems while helping modernise them?

We are hiring a .NET Developer to join a collaborative, office-based engineering team within an established UK financial services organisation. This role offers a rare opportunity to work on a live, customer-facing platform while actively contributing to its evolution toward modern .NET and Azure technologies.

This is not a pure greenfield role. It is not a legacy-only support role. It is a genuine blend of both.

The Role

You will work on a business-critical lending platform used daily by customers across the UK.

The role is approximately:

* 60% backend

* 40% front-end

You will:

* Maintain and enhance an existing ASP.NET MVC application

* Build and improve backend logic using C#

* Work with Entity Framework and SQL Server

* Write and optimise T-SQL queries

* Contribute to UI updates when required

* Help drive the ongoing migration to .NET Core

* Support the move to Azure App Services

* Contribute to improving engineering standards and practices

This is a hands-on, full-stack position with strong backend depth.

Current Tech Stack

ASP.NET - MVC 5 - .NET Framework - C# - Entity Framework - 6SQL Server - JavaScript / jQuery - HTML & CSSAzure SQL VMs

Modernisation Roadmap

* Migration to .NET Core

* Azure App Services adoption

* Improved SOLID and TDD practices

* AI integrations

* Continued cloud optimisation

You will play an active role in shaping this transition.

What We Are Looking For

* Strong C# development experience

* Experience with ASP.NET MVC and .NET Framework

* Exposure to .NET Core

* Solid SQL Server and T-SQL skills

* Comfortable working full-stack in a backend-heavy role

* Strong communication skills

* Able to work collaboratively in an office-based environment

Desirable

* Experience migrating to .NET Core

* Azure exposure

* Experience with App Services

* Understanding of SOLID principles and TDD

* Mentoring experience

The Ideal Candidate

You will thrive here if you:

Enjoy working with complex systems

Are comfortable maintaining legacy code

Are motivated to modernise and improve platforms

Communicate clearly and confidently

Want long-term impact rather than short-term project work

If you are a .NET Developer who can balance maintaining a live production system with helping move it toward modern architecture, we would love to hear from you

C# Developer - Desktop Applications
GCS
London
Hybrid
Mid - Senior
£400/day - £415/day
RECENTLY POSTED

Global bank based in Canary Wharf.

Role - C# Developer - Desktop Applications

Duration - 6 months with likely extension

Rate - 415 p/d (inside IR35)

Location - Hybrid / Canary Wharf

Tech Stack

  • C#
  • WPF
  • Winforms
  • SQL
  • Oracle

Tasks

  • Tasks range from understanding business requirements, designing application structures, business data analysis, programming WPF (Windows Presentation Foundation) applications in Visual C#.NET on both Oracle and SQL Server database, testing with users, implementation through Development, Quality Assurance (QA), Production and Disaster Recovery environments. Supporting users and writing operation documents including User Helps (manuals) will also be required.
  • As well as application development, this role will also include all aspects of system constructions and support for existing programmes which are written as WinForms (C#.NET) applications. Also, applications written in other languages like MS VBA for Excel and Access, MS VB and MS Excel Macros will also be required.

Additional Tasks

  • Defining Database objects required in systems to connect with SQL and Oracle Database Administrators in both London and New York.
  • Providing script for database inquiry languages, i.e., T-SQL (SQL Server) and PL/SQL (Oracle) to perform data analysis based on requirements from business parties.
  • Setting up a system distribution method to Citrix and application servers for both Web and Window applications.
  • Troubleshooting systems in an event of failure and implementing necessary solutions by checking Windows Operating System, Internet Information Server and any other relevant environments where the applications are running. In some case this role will act to liaise with other application support team staff.
  • Following the existing team programming policy to keep a common development style to be shared in team members.
  • Updating versions of MS .Net Framework and MS Visual .NET platform to include any necessary changes of existing systems running in Production.
  • Liaising with the relevant support teams such as other Development sections, Technical Support, Network and Infrastructure and DBA where Business users experience system problems.
  • Assessing the impact of data processing loads on SQL and Oracle database and, when appropriate, finding alternative approaches.
  • Rolling out changes with a coordination of Release manager. It is important to maintain the change history of applications

GCS is acting as an Employment Business in relation to this vacancy.

Solution Architect, .NET, C#, GenAI, Azure, Microsoft, Central London
Carrington Recruitment Solutions
London
Hybrid
Mid - Senior
£75,000 - £85,000
RECENTLY POSTED

Solution Architect, Azure, AWS, Cloud Tech, Senior Developer, .NET, C#, GenAI, AI, Microsoft Stack, Professional Services, London

Solution Architect required to work for a large and exciting firm based in Central London. This will mainly be based from home and you would only have to visit the office circa twice a month.

We need this individual to join this exciting, forward thinking technology team to help design solutions around complex products and applications that sit on Microsoft Azure and AWS (mainly Azure). A Microsoft Technology Stack background is essential, and you must be from a Software Engineering or Application Engineering background. This is NOT an Infrastructure based Solution Architect and is focused more around Development (.NET / C# etc).

If you have an Enterprise Architect background and want to apply for this, there would be huge questions as to why you would want this kind of role in the first place. We need someone who:

* Is excellent with Stakeholders and is a proven communicator with good negotiation skills

* Can come up with the most weird and whacky Proof of Concepts (POCs) and be able to present these to the business, explaining the benefits etc

* Is happy to be centred around ‘Product’ and can be creative with this around the business and the business needs

* Is proven with working alongside Developers, proving clear and concise instructions for each journey ahead

* Is happy with lots of prototyping and playing a major part in building the products

* Has recent experience working with Developers who use GenAI to get from A to B more efficiently

* Has some experience with AI related products

We can consider Senior Developers for this role but you must have some experience within Solution Architecture. Also, experience of dealing with 3rd party vendors is be a must. In addition to this, you will have come from environments that have complex integration layers when it comes to products and applications. It is a heavily regulated environment and you have to be mindful of this.

In summary, we need a hands-on, product-focused Solution Architect who builds prototypes, works closely with dev teams, operates in public cloud, understands modern engineering, and can influence stakeholders while helping shape early-stage products in a Microsoft-heavy environment.

We can consider people who have worked for large, complex businesses, along with candidates who have worked within consultancy practices in the past.

This is an excellent opportunity and salary is dependent upon experience. Apply now for more details

Forward Deployed Engineer
Hexwired Recruitment Limited
London
In office
Graduate - Junior
£45,000 - £120,000
RECENTLY POSTED
+1

Forward Deployed Engineer – London –DOE - £45k - £120k

Hexwired Recruitment has partnered with one of the largest LLM platforms in the world, who have been valued in the Billions who are now opening a brand new office in London to service the EMEA region. As part of the first stage of their expansion, they have asked us to search for Forward Deployed Engineers to assist their customers with integration of their products.

As a Forward Deployed Engineer, you will be one of the ambassadors of the business, helping customers across EMEA integrate and deploy their LLM platform. Focusing on customer success as well as building long term relationships with some of the biggest software companies in the world!

The company are looking for Deployed Engineers with a proven track record of success in anything they have done. Whether it be Development, academics or even hobbies!

Responsibilities

* Assisting Software and transformation companies with integrating and deploying the companies products

* Identifying use cases for the platform for your customers, ensuring the product is used effectively

* Building long standing relationships with customers

Key skills required for this role:

* Masters or PhD in a relevant field from a Russel Group university or similar level of university in Europe

* A background in Engineering (Software, Networking, Infrastructure, ML and more can be considered)

* High achiever in your chosen field (Sports, academics, Software or anything interesting!)

* Excellent Written and verbal communication skills with an interest in dealing with stakeholders and technical leaders

* Ex Founders or advocates for AI are highly sought after

Being part of an ever-growing market, the company is always looking to grow, meaning you can grow with it! Each compensation package is bespoke and will include salary and options in a multi-Billion dollar business. If you are interested in this Forward Deployed Engineer role, please apply!

For more information on this role, or any other jobs across; Embedded, C++ programming, Embedded Linux, Golang Development, C# .net, AI, Mechanical Design, Machine Learning, AI, FPGA, Electronics, Java, Python, Data Science or Simulation contact us today

Lead Developer, .NET, C#, Azure, Logic Apps, React, GenAI, Part Remote
Carrington Recruitment Solutions
London
Fully remote
Senior
£80,000 - £89,000
RECENTLY POSTED

Lead Developer, Azure, .NET, C#, React, LogicApps, Full Stack Engineer, Mainly Remote

Lead Developer required for a Professional Services business based in Central London. There will be a requirement to be present in the office circa twice a month. On the odd occasion it may be more than this…

We need someone with the following skills:

* The following skills as absolute PRIME - .NET, C#, Azure (including Logic Apps) and React. AZURE FIRST! Not AWS or GCP

* Strong Leadership where you have operated as a Lead Developer in a current of previous role

* Solid Azure skills from a Development perspective. Previous candidates usually fall down on their lack of skills with LogicApps – this is essential

* Good, hardened Full Stack Development skills within C#, .NET, React, JavaScript, HTML/CSS, Azure PaaS (Azure Functions, Azure Logic Apps, Cosmos DB, Azure App Service, ARM/Bicep templates), SharePoint

* Acceptance that Development is now reliant on GenAI, using examples of where you have done this before and an appreciation of the pace it is moving

* Someone who has experienced Greenfield Development – not all things developed will necessarily be rolled and delivered – you have to be prepared this may be the case on occasions

* Excellent personality with a forward thinking approach, high energy and lots of enthusiasm

* Proven experience with C-Suite Stakeholder Management

It will be a 2 stage interview process involving a Scenario and a Test. The Scenario will be ‘you have either done it or you haven’t – the use of GenAI for this would be forbidden! The Test will be over the course of a few days where GenAI is almost essential to use. If you don’t use it, you will be questioned as to why! This is the kind of mentality required for this role, so is it you?

This is a great opportunity and salary is dependent upon experience. Apply now for more details

Lead Software Engineer - Platform
Fruition Group
City of London
Hybrid
Senior
£100,000
RECENTLY POSTED

London - 4 days onsite (Paddington)

£110k - £140k + Benefits

We’re hiring for one of the UK’s fastest growing fintech scale-ups, where reliability is a competitive advantage not a luxury. As a Principal Software Engineer you will be providing deep technical leadership alongside being extremely hands on as part of a platform team. Lead Engineers will set technical directions, drive engineering standards and strategy while remaining deeply embedded in implementation and operational excellence.

Responsibilities:

Architect and implement highly available, multi-region infrastructure services

Define resilience patterns across services (failover, circuit breaking, back-pressure, etc.)

Lead large-scale refactoring or reliability improvement initiatives

Establish best practices in incident response, observability, and SLO management

Drive adoption of modern cloud-native and GitOps practices

Mentor senior engineers and influence engineering culture at scale

Skills Required:

Strong backend engineering ability (Go, Java or .NET)

Extensive hands on expertise designing and operating high scale distributed systems

Deep expertise in cloud native architecture (GCP/AWS)

Advanced Kubernetes and container orchestration expertise

Proven track record of mentoring and technical leadership.

Why this role:

You’ll get the opportunity to influence architecture across a multi country product.

You’ll work in an engineering led organisation where technical excellence drives business success

Have the opportunity to remain hands on while shaping long term platform best practices.

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.

TPBN1_UKTJ

Senior Software Engineer - Platform
Fruition Group
City of London
Hybrid
Senior
£100,000
RECENTLY POSTED

London - 4 days on site (Paddington)

£90k - £110k + benefits

We’re hiring for one of the UK’s fastest growing fintech scale-ups. As a Senior Software Engineer, you will be deeply hands-on designing, building, deploying and operating scalable infrastructure services as part of a platform team. This is a role for someone who enjoys solving hard distributed systems problems and building robust foundations that others depend on.

Responsibilities:

Design, build, deploy, and operate secure, scalable infrastructure and automation

Improve and develop tools that make infrastructure easier for engineers to use

Research and adopt modern cloud-native technologies and best practices

Promote high engineering standards across code quality, testing, and automation

Skills:

Strong backend engineering capability (Golang, Java, or .NET)

Strong hands-on experience building and operating distributed systems in cloud environments (AWS or GCP)

Kubernetes and container orchestration experience

Infrastructure as Code experience (Terraform, Pulumi, Crossplane or similar)

Proven track record leading platform or reliability transformations

Ability to influence across teams without formal authority

If you want to work on a product used by over 100,000 customers this is the role for you.

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.

TPBN1_UKTJ

Junior C# Developer
VIQU IT
London
Hybrid
Junior
£300/day - £350/day
RECENTLY POSTED

Junior C# Developer – 6-month contract – London – SC Cleared – Inside IR35

My Financial Services customer is looking for a Junior C# Developer, that will play a key role in triaging and resolving technical queries during the development of the Synchronisation Lab to act as a platform for industry to demonstrate use cases and understand business models for synchronisation. The Junior C# Developer will proactively engage with Product and development teams to ensure timely responses to queries.

You’ll be joining a collaborative, forward-thinking engineering team delivering scalable, secure, and high-performing solutions within Azure.

Junior C# Developer Skills & Experience required:

Active SC Clearance.
Strong hands-on experience with C#, .NET and SQL.
Experience with Agile ways of working.
Experience with a Microsoft Azure based environment.
Experience in the financial Services sector.
High level support with incident response and troubleshooting.
Eagerness to learn and improve interpersonal skills.
Junior C# Developer Key Responsibilities:

Triaging and resolving technical queries.
Build and maintain database structures and queries using SQL.
Support the enhancement of synchronisation models based on participant feedback.
Collaborate with developers and the production team.
Delivering the technical release of later synchro models.
You must be able to work onsite 2 days per week in London.

Apply now to speak with VIQU IT in confidence. Or reach out to Phoebe Thompson via the VIQU IT website.

Do you know someone great? We’ll thank you with up to £1,000 if your referral is successful (terms apply).

For more exciting roles and opportunities like this, please follow us on LinkedIn @VIQU IT Recruitment

C# Developer - Desktop Applications - Banking
GCS
London
Hybrid
Mid - Senior
£400/day - £415/day
RECENTLY POSTED

Global bank based in Canary Wharf.

Role - C# Developer - Desktop Applications

Duration - 6 months with likely extension

Rate - £415 p/d (inside IR35)

Location - Hybrid / Canary Wharf

Tech Stack

C#
WPF
Winforms
SQL
OracleTasks

Tasks range from understanding business requirements, designing application structures, business data analysis, programming WPF (Windows Presentation Foundation) applications in Visual C#.NET on both Oracle and SQL Server database, testing with users, implementation through Development, Quality Assurance (QA), Production and Disaster Recovery environments. Supporting users and writing operation documents including User Helps (manuals) will also be required.
As well as application development, this role will also include all aspects of system constructions and support for existing programmes which are written as WinForms (C#.NET) applications. Also, applications written in other languages like MS VBA for Excel and Access, MS VB and MS Excel Macros will also be required.

Additional Tasks

Defining Database objects required in systems to connect with SQL and Oracle Database Administrators in both London and New York.
Providing script for database inquiry languages, i.e., T-SQL (SQL Server) and PL/SQL (Oracle) to perform data analysis based on requirements from business parties.
Setting up a system distribution method to Citrix and application servers for both Web and Window applications.
Troubleshooting systems in an event of failure and implementing necessary solutions by checking Windows Operating System, Internet Information Server and any other relevant environments where the applications are running. In some case this role will act to liaise with other application support team staff.
Following the existing team programming policy to keep a common development style to be shared in team members.
Updating versions of MS .Net Framework and MS Visual .NET platform to include any necessary changes of existing systems running in Production.
Liaising with the relevant support teams such as other Development sections, Technical Support, Network and Infrastructure and DBA where Business users experience system problems.
Assessing the impact of data processing loads on SQL and Oracle database and, when appropriate, finding alternative approaches.
Rolling out changes with a coordination of Release manager. It is important to maintain the change history of applicationsGCS is acting as an Employment Business in relation to this vacancy

Lead Software Engineer - Platform
Fruition Group
London
Hybrid
Senior
£110,000 - £140,000
RECENTLY POSTED

London - 4 days onsite (Paddington)

£110k - £140k + Benefits

We’re hiring for one of the UK’s fastest growing fintech scale-ups, where reliability is a competitive advantage not a luxury. As a Principal Software Engineer you will be providing deep technical leadership alongside being extremely hands on as part of a platform team. Lead Engineers will set technical directions, drive engineering standards and strategy while remaining deeply Embedded in implementation and operational excellence.

Responsibilities:

  • Architect and implement highly available, multi-region infrastructure services
  • Define resilience patterns across services (failover, circuit breaking, back-pressure, etc.)
  • Lead large-scale refactoring or reliability improvement initiatives
  • Establish best practices in incident response, observability, and SLO management
  • Drive adoption of modern cloud-native and GitOps practices
  • Mentor senior engineers and influence engineering culture at scale

Skills Required:

  • Strong Back End engineering ability (Go, Java or .NET)
  • Extensive hands on expertise designing and operating high scale distributed systems
  • Deep expertise in cloud native architecture (GCP/AWS)
  • Advanced Kubernetes and container orchestration expertise
  • Proven track record of mentoring and technical leadership.

Why this role:

  • You’ll get the opportunity to influence architecture across a multi country product.
  • You’ll work in an engineering led organisation where technical excellence drives business success
  • Have the opportunity to remain hands on while shaping long term platform best practices.

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.

Software Development Lead Bank
Huxley Associates
London
Hybrid
Senior
£70,000 - £80,000
RECENTLY POSTED

Software Development Lead Banking London

This is a new and exclusive opportunity for a Software Development Lead to join this thriving investment Bank as they expand their software development team

Role details

Title Software Development Lead
Employer: investment Banking
Location: London city Liverpool street station and home working hybrid 50/50%
Permanent role Salary range: £(Apply online only)k
Role requirements: team management, software development strong prior background in development in any of the core technologies: C#, .Net, Java, SQL

This is a great opportunity for a team leader to lead a brilliant software development team. You will be leading a team of developments. The technical stack is C#, .Net, Java, SQL

This role will report into the Head of Development within the Post trade technology area of the bank.

This role is focused on People management and team management

Role requirements

Team leading and team management experience
Development background - strong prior background in development in any of the core technologies: C#, .Net, Java, SQL

For more information and the chance to be considered, please do send through a CV

Good luck

To find out more about Huxley, please visit

Huxley, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy | Registered office | 8 Bishopsgate, London, EC2N 4BQ, United Kingdom | Partnership Number | OC(phone number removed) England and Wales

Lead DevOps Engineer - Active SC, Intersystems
Hays Technology
London
Hybrid
Senior
£400/day - £500/day
RECENTLY POSTED

Lead DevOps Engineer - Active SC, Intersystems Up to £500 per day (Outside IR35) London / Hybrid 6 months My Client is an instantly recognisable Consultancy, who require a Senior / Lead DevOps Engineer that holds Active SC (Security) Clearance, and has worked with Intersystems, to work closely with a key end client. Key Requirements: Proven experience as a Lead DevOps / Application Support Engineer with Active Security Clearance (SC) Experience leading team of Application Support Engineers Proven experience in application management in Azure environments Strong Knowledge of ITIL Experience of development within Healthcare (InterSystems Health Share and Health Connect) Excellent understanding of EMPI, PD, Integration engine and IRIS Nice to have: ITIL Certification Development with Azure, Microsoft .Net, Terraform and Ansible Experience of Azure DevOps / Jira 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. 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 at (url removed)

Senior C# Developer - London - Perm
Infused Solutions Ltd
London
In office
Senior
£50,000 - £70,000
RECENTLY POSTED

Senior C# Developer

Location: London (Fully Onsite)
Employment Type: Permanent
Salary: 50,000 - 70,000 (DOE)
Visa Sponsorship: Not available

We’re working with a London-based organisation that is looking to hire an experienced Senior C# Developer to join their engineering team in a fully onsite position. This role is ideal for someone who enjoys hands-on development, working closely with the business, and taking ownership of complex systems.

The Role

As a Senior C# Developer, you’ll be responsible for designing, developing, and maintaining business-critical applications built on C#/.NET and SQL. You’ll play a key role in technical decision-making, improving code quality, and ensuring the reliability and performance of core systems.

You’ll work closely with other developers, QA, product owners, and non-technical stakeholders, contributing across the full software development lifecycle.

Key Responsibilities

  • Design, develop, and maintain applications using C# / .NET
  • Write, optimise, and maintain SQL queries, stored procedures, and database schemas
  • Contribute to technical architecture and system design discussions
  • Carry out code reviews and promote best development practices
  • Support and mentor junior and mid-level developers
  • Troubleshoot, debug, and improve existing systems
  • Collaborate closely with business and technical teams onsite

Essential Skills & Experience

  • Strong commercial experience as a Senior C# Developer
  • Advanced knowledge of C# / .NET
  • Strong experience working with SQL (SQL Server or similar)
  • Experience delivering and supporting production-grade applications
  • Solid understanding of software design principles and best practices
  • Comfortable working in a onsite London-based team
  • Strong communication and stakeholder engagement skills

Desirable Skills

  • Experience with modern .NET versions
  • Exposure to cloud platforms (Azure, AWS, or similar)
  • Experience with RESTful APIs
  • Familiarity with Agile / Scrum environments

What’s On Offer

  • Salary of 50,000 - 70,000 depending on experience
  • onsite role in London
  • Opportunity to work on business-critical systems
  • Collaborative, experienced engineering team
  • Long-term stability and career progression

Apply Now

If you’re a Senior C# Developer looking for an onsite role in London where you can have real technical ownership and work on complex systems, we’d love to hear from you.

Azure Integration Engineer
DGH Recruitment Ltd
London
Hybrid
Mid - Senior
£75,000 - £85,000
RECENTLY POSTED

Azure Integration Services (AIS) / Azure Logic Apps / Azure Function Apps / .NET / C# / Blazor

City of London (3 days per week required in the office)

DGH Recruitment are currently recruiting on behalf of a leading global client who are looking for an Azure Integration Engineer to join the team on a permanent basis in their London office.

The role will act as a technical product owner and Subject matter expert for Azure integrations and as such require someone with strong Azure Integration Services (AIS) experience.

Responsibilities:

  • Serve as a primary subject matter expert (SME) for Azure Integration Services, providing deep knowledge and proactive support.
  • Own the technical direction of the applications you are responsible for, ensuring alignment with the Technology roadmap, business strategy and user needs.
  • Participate in or lead agile ceremonies such as sprint planning, backlog refinement and
    retrospectives.
  • Collaborate with stakeholders to gather requirements and translate them into practical
    application changes or enhancements.
  • Maintain documentation related to application change control and configuration, processes and procedures.

Required Skills / Experience:

  • Expert knowledge of Azure Integration Services (AIS)
  • Strong experience developing Logic Apps, Function Apps and custom Excel add-ins
  • Expert knowledge of C#, .NET and Blazor
  • Excellent stakeholder management skills
  • Familiarity with Master Data Management Solutions (desirable)
  • Familiarity with DevOps, Github and Copilot (desirable)

Azure Integration Engineer

In accordance with the Employment Agencies and Employment Businesses Regulations 2003, this position is advertised based upon DGH Recruitment Limited having first sought approval of its client to find candidates for this position.

DGH Recruitment Limited acts as both an Employment Agency and Employment Business

Senior Software Engineer C# .Net - Hedge Fund
client server
London
In office
Senior
£100,000
RECENTLY POSTED

Senior Software Engineer / Developer (C# .Net) London onsite to £150k

Join a global hedge fund specialising in sports trading as a Senior Software Engineer, working on high-performance, real-time trading systems. You’ll own greenfield projects, partner directly with quants and strategy teams and build low-latency backend components and APIs with C# .Net, plus occasional frontend work in React.

What you’ll do:

Design and develop real-time trading and pricing systems

Lead greenfield feature builds with significant business impact

Build backend services, APIs and trading engine components in C#

Collaborate closely with strategy, quant and engineering teams

Tech: C# .Net, ASP.Net, SQL / Oracle, JavaScript, React

Location:

You’ll be based in plush City office on a fulltime basis, Monday to Friday.

About you:

You have expertise with C# .Net, ASP.Net development

You have a strong knowledge of databases (SQL or Oracle)

You’re comfortable with JavaScript / React

You have a thorough knowledge of Computer Science fundamentals such as OOP, Design Patterns, Data Structures, Algorithms

You are collaborative with excellent communication and stakeholder management skills

You are degree educated in Computer Science or similar technical discipline

What’s in it for you:

As a Senior Software Engineer / Developer you will receive a competitive package:

Salary to £150k

Bonus paid every six months based on personal performance (10-25%)

Professional development

Pension

Health Insurance

Gym membership

Social events, free fruit, snacks, coffee etc.

Apply now to find out more about this Senior Software Engineer / Developer (C# .Net) 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

SDET
WeDoTech
London
Hybrid
Mid - Senior
£70,000 - £75,000
RECENTLY POSTED

Job Title
QA Engineer / SDET
Location
South London (Hybrid, 2 days per week onsite)
Salary
Up to 75,000 base + bonus + pension

About the Company
WeDo is partnering with a global technology and professional services organisation that develops specialised software platforms used by hundreds of enterprise clients worldwide. Their products help large organisations make complex financial and risk decisions through advanced modelling, analytics, and reporting tools.

The company is continuing to invest heavily in engineering quality and automation as part of the ongoing evolution of its flagship desktop platform, which is widely used across the insurance and financial services sectors. Engineering teams operate in a collaborative Agile environment where QA engineers play a key role in improving testing strategy, automation capability, and overall delivery confidence.

The Position
Our client is looking for a QA Engineer / SDET to join a cross functional engineering squad responsible for maintaining and enhancing a widely used desktop platform currently used by more than 650 enterprise clients.

The role is heavily focused on test automation and improving efficiency across the testing process. The successful candidate will work on stabilising and expanding an existing automation suite containing thousands of tests while ensuring releases remain reliable and predictable.

You will take ownership of test planning and release quality within the team, working closely with developers and product stakeholders to identify risks, improve test coverage, and strengthen overall product quality. While automation is the primary focus, the role also involves some manual and exploratory testing of complex business workflows.

The platform is currently a desktop application and will remain so for the foreseeable future, although the broader engineering organisation is continuing to modernise its technology stack.

Requirements

  • 3 to 5+ years experience in a QA Engineer or SDET role within Agile engineering teams
  • Strong automation experience using C# and .NET
  • Experience building, improving or maintaining automation frameworks
  • Experience working with REST APIs and tools such as RestSharp
  • Experience working with CI pipelines and Azure DevOps
  • Comfortable performing manual and exploratory testing where required
  • Experience testing desktop applications or complex enterprise software environments
  • Proactive mindset with the ability to take ownership of release quality and testing strategy
  • Interest in using AI tools to improve testing efficiency and engineering workflows

Nice to have

  • Experience with desktop UI automation tools such as Ranorex
  • Exposure to Azure environments

Recruitment process

  1. Initial screening call with the Lead QA
  2. Take home technical exercise focused on test automation
  3. Two stage onsite interview including technical discussion and competency interview

Interested?
Apply for the position or send your CV to (url removed).

Senior Python Developer
Experis
London
Hybrid
Senior
£500/day - £540/day
RECENTLY POSTED
+7

Duration: 14 Months

Location: London, UK (3 days in office)

Active SC Clearance required

Inside IR35 - Umbrella only

About the Role:

  • We are seeking a highly skilled and versatile Senior Developer to join our team and contribute to the development and maintenance of our cutting-edge Azure Databricks platform for economic data. This platform is critical for our Monetary Analysis, Forecasting, and Modelling activities. The Senior Developer will be responsible for both front-end and back-end development, with a focus on Python, including the challenging but rewarding task of reverse engineering an existing codebase to integrate new features and improvements. This role requires a strong understanding of software development principles, experience with various programming languages and frameworks, and a passion for building high-quality, scalable, and maintainable software. Drive the development of MVPs, ensuring timely delivery and alignment with business goals.

Key Responsibilities:

Full-Stack Development:

  • Contribute to both front-end and back-end development of applications and APIs interacting with the Azure Databricks platform.
  • Develop user interfaces using modern front-end frameworks (e.g., React, Angular, Vue.js) and ensure a seamless user experience.
  • Develop robust and efficient back-end services and APIs using Python.

Python Development:

  • Develop and maintain Python code for data processing, API development, and integration with the Azure Databricks environment.
  • Utilise relevant Python libraries and frameworks (e.g., Flask, Django, Pandas, NumPy).
  • Collaborate with cross-functional teams to build and enhance banking applications
  • Work closely with UI/UX Designers to integrate visualizations seamlessly into web applications or other platforms
  • Work on data interfaces to connect various systems within the bank.
  • Write unit and integration tests to ensure code quality and reliability.

.NET Development (Optional): Develop and maintain .NET code for back-end services, APIs, and integrations with other systems.

  • Utilise relevant .NET frameworks and technologies (e.g., ASP.NET Core, C#, Entity Framework).
  • Write unit and integration tests to ensure code quality and reliability.

Reverse Engineering:

  • Analyse and understand existing codebases (potentially Python) to identify areas for improvement, bug fixes, and new feature implementation.
  • Document findings and create clear specifications for changes.
  • Implement changes while maintaining the stability and functionality of the existing system.

Join us to work on impactful projects, utilise cutting-edge tech, and be part of a collaborative team shaping public sector innovation. Apply now to make a difference!

Geospatial Software Engineer
ISR Recruitment Ltd
London
Remote or hybrid
Mid - Senior
Private salary
RECENTLY POSTED
+5

The Opportunity:

You’ll join an experienced, collaborative consultancy team delivering greenfield, enterprise-scale digital services for high-profile public and private sector clients.

This opportunity is ideal for a practical, adaptable Geospatial Software Engineer who enjoys working across disciplines and solving complex problems and challenges that will have a real-world impact.

Collaboration sits at the heart of how our client operates, so you’ll be partnering closely with colleagues across Software Engineering, User-Centred Design, Delivery Management, Data Science and Live Services to deliver outcomes that genuinely make a difference in today’s society.

As a consultancy, they are technology-agnostic by design, focusing on choosing the right tools for each problem, rather than forcing one stack everywhere.

Their teams regularly work with .NET, Java, Python, Node.js, AWS and Azure, giving you genuine scope to broaden your skills and develop your career across a range of languages and platforms.

Many of their projects also involve Geographic Information Systems (GIS) and open-source geospatial technologies, helping clients unlock the value of location-based data through mapping, spatial analysis and data-driven decision making.

Skills and Experience:

Essential

  • 3+ years’ experience in a Full Stack Engineering role
  • Strong development skills in .NET, Java or Python, alongside modern JavaScript frameworks/libraries
  • Experience working in Agile environments (Scrum, Kanban, TDD)
  • Solid understanding of architectural and design patterns, including microservices and serverless
  • Hands-on experience designing and delivering solutions on AWS or Azure
  • Experience working with GIS systems or geospatial data, and familiarity with tools such as Leaflet, OpenLayers, QGIS, GeoServer, PostGIS, etc.
  • A collaborative mindset and experience working in multi-disciplinary teams

Desirable

  • Experience working in a consultancy environment
  • Exposure to public sector projects
  • Familiarity with CI/CD tooling (eg Jenkins, Terraform)
  • Awareness of the Digital Service Standard and Technology Code of Practice, particularly in geospatial or public sector contexts

Role and Responsibilities:

This is a varied role suited to someone who enjoys the pace, responsibility and collaboration of consultancy.

You will be involved with the following types of activity:

  • Design and deliver high-quality solutions: building, enhancing and maintaining software, infrastructure and deployment pipelines that are robust, secure and scalable. Projects may include solutions involving geospatial data, GIS platforms and open-source mapping tools.
  • Work collaboratively across disciplines: partnering with Senior and Lead Engineers, Delivery Managers, Designers and Data Scientists to shape solutions, contribute to technical documentation and deliver against agreed plans.
  • Apply standards and best practice: follow established engineering approaches, contribute accurate technical estimates and proactively identify and escalate risks or issues.
  • Communicate clearly and build relationships: present ideas, prototypes and progress updates to stakeholders, while building strong working relationships with colleagues, clients and partner organisations.

Applications:

Please contact Edward here at ISR to learn more about our client and how they are leading the way in developing the next generation of technical solutions through innovation and transformational technology?

Lead DevOps Engineer - Active SC, Intersystems
Hays Technology
London
Hybrid
Senior
£400/day - £500/day
RECENTLY POSTED

Up to 500 per day (Outside IR35)

London / Hybrid

6 months

My Client is an instantly recognisable Consultancy, who require a Senior / Lead DevOps Engineer that holds Active SC (Security) Clearance, and has worked with Intersystems, to work closely with a key end client.
Key Requirements:

  • Proven experience as a Lead DevOps / Application Support Engineer with Active Security Clearance (SC)
  • Experience leading team of Application Support Engineers
  • Proven experience in application management in Azure environments
  • Strong Knowledge of ITIL
  • Experience of development within Healthcare (InterSystems Health Share and Health Connect)
  • Excellent understanding of EMPI, PD, Integration engine and IRIS

Nice to have:

  • ITIL Certification
  • Development with Azure, Microsoft .Net, Terraform and Ansible
  • Experience of Azure DevOps / Jira

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.

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 at (url removed)

Software Development Lead Bank
Huxley Associates
London
Hybrid
Senior
£70,000 - £80,000
RECENTLY POSTED

Software Development Lead Banking London

This is a new and exclusive opportunity for a Software Development Lead to join this thriving investment Bank as they expand their software development team

Role details

  • Title Software Development Lead
  • Employer: investment Banking
  • Location: London city Liverpool street station and home working hybrid 50/50%
  • Permanent role Salary range: (Apply online only)k
  • Role requirements: team management, software development strong prior background in development in any of the core technologies: C#, .Net, Java, SQL

This is a great opportunity for a team leader to lead a brilliant software development team. You will be leading a team of developments. The technical stack is C#, .Net, Java, SQL

This role will report into the Head of Development within the Post trade technology area of the bank.

This role is focused on People management and team management

Role requirements

  • Team leading and team management experience
  • Development background - strong prior background in development in any of the core technologies: C#, .Net, Java, SQL

For more information and the chance to be considered, please do send through a CV

Good luck

To find out more about Huxley, please visit (url removed)

Huxley, a trading division of SThree Partnership LLP is acting as an Employment Business in relation to this vacancy Registered office 8 Bishopsgate, London, EC2N 4BQ, United Kingdom Partnership Number OC(phone number removed) England and Wales

Lead .Net Software Developer
Spectrum IT Recruitment
City of London
Hybrid
Senior
£75,000 - £500,000
+1

Senior .Net Developer | Full Stack Engineer - Build the Future of Data Lineage & AI London (Hybrid) | High‑Impact SaaS Engineering Role C#, ASP.Net Core, TypeScript, React, Computer Science Company Size: Approx. 60 Salary Range: £75k-£95k + equitySpectrum Recruitment is partnered with a fast-growing, venture-backed SaaS company helping organisations understand and control complex data flows. Their platform enables enterprises to model, visualise, and manage data lineage, bringing clarity to some of the most challenging problems in modern data environments. Why are they hiring? Product Demand | Scale | Increasing team capabilities As demand for the product increases and market interest builds the team needs greater experience and capabilities for scale. The current team is primarily made up of very clever graduates from ICL led by an experienced Head of Tech. They are looking for Developers to help the team evolve, add rigor and depth of knowledge to take the team and company to the next level. Why This Role Stands Out Work on genuinely complex engineering problems involving data modelling, visualisation, and emerging AI capabilities. Own meaningful product features in a small, highly skilled engineering team. Use a modern technology stack with freedom to innovate and influence technical direction. Join a collaborative culture with R&D time, knowledge sharing, and hackathons.Technology C#, .NET Core, ASP.NET Core, TypeScript, React, cloud-hosted SaaS architecture, and exposure to AI-assisted development and data visualisation. Who This Would Suit Established, Senior Engineers who enjoy solving complex problems, care about clean architecture and UX, and want a role where their work has visible impact on both product and customers. A degree in Computer Science or Software Engineering is a must. Environment & Culture Hybrid working (usually two days per week in a central London office) alongside a collaborative and ambitious engineering team. A friendly, sociable culture where people genuinely enjoy working together to solve complex challenges and have fun while doing it. You'll also have clear opportunities to learn, develop, and influence the future direction of the technology and team. Interested? If you're an experienced developer looking for a technically interesting role where your work genuinely matters, this is worth a conversation. Hit apply or contact for more info. Spectrum IT Recruitment (South) Limited is acting as an Employment Agency in relation to this vacancy

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