22 software developer jobs found in London, Greater London

Senior Product Developer - 3 Positions A leading Market Data and Intelligence organisation is looking for three Senior Product Developers to join its engineering teams, working on software and data products within a large-scale, data-driven environment. The roles will focus on developing and enhancing applications using .NET/C#, Azure and SQL Server , with responsibility across the full software development life cycle. You'll be working on products supporting financial institutions and investment professionals, solving complex technical and data challenges. The technology environment is centred around the Microsoft ecosystem , with .NET/C#, SQL Server and Azure forming key parts of the platform. Depending on the product area, you may also work with Azure DevOps, CI/CD, REST APIs, Blazor and data ingestion/ETL . As a senior developer, you'll contribute to technical decisions, improve existing systems, address technical debt and work closely with Product, Engineering,...

Title: Software Developer in Test Client: Growing Fintech Rate: up to £600 P/D (Outside IR35!) Location: London (Hybrid) We are looking for a talented an enthusiastic SDET to join a rapidly expanding fintech based in London! You will get the chance to work along side some of the best SDETs and software engineers that the industry has to offer whilst aiding in the development of their C# platforms! If you are a tech driven and enthusiastic individual this is the role for you! Requirements: Strong experience in automation testing - building and implementing frameworks etc Strong experience working with C# Experience with JavaScript - nice to have Experience working in capital markets finance Experience with performance testing If this sounds like you then please do not hesitate to reach out!

Senior Product Developer - 3 Positions A leading Market Data and Intelligence organisation is looking for three Senior Product Developers to join its engineering teams, working on software and data products within a large-scale, data-driven environment. The roles will focus on developing and enhancing applications using .NET/C#, Azure and SQL Server , with responsibility across the full software development lifecycle. You'll be working on products supporting financial institutions and investment professionals, solving complex technical and data challenges. The technology environment is centred around the Microsoft ecosystem , with .NET/C#, SQL Server and Azure forming key parts of the platform. Depending on the product area, you may also work with Azure DevOps, CI/CD, REST APIs, Blazor and data ingestion/ETL . As a senior developer, you'll contribute to technical decisions, improve existing systems, address technical debt and work closely with Product, Engineering,...

Contract C#/.net Engineer - Capital Markets Location: UK-based remote overlapping Gulf Standard Time 6 month contract; outside IR35 Our client is seeking a highly experienced C#/.net Engineer to develop and support technology within a capital-markets environment. This role is suited to an engineer with deep commercial C# experience who has worked on financial-markets platforms, rather than a general enterprise software developer. Relevant experience may include: Trading and execution platforms Pricing and valuation systems Risk engines and analytics Market-data platforms Order-management systems Portfolio or investment-management systems Derivatives, FX, equities, Fixed Income or commodities technology Exchange connectivity, FIX or low-latency systems The successful candidate will have: Extensive hands-on experience with C# and .net A strong understanding of capital-markets systems and workflows Experience designing and delivering reliable,...

Title – Software Developer in Test Client – Growing Fintech Rate - Up to £600 P/D Location – London (Hybrid)   We are looking for a talented an enthusiastic SDET to join a rapidly expanding fintech based in London!!   You will get the chance to work along side some of the best SDETs and software engineers that the industry has to offer whilst aiding in the development of their Java platforms!!   If you are a tech driven and enthusiastic individual this is the role for you!!   Requirements:   Strong experience in automation testing - building and implementing frameworks etc Strong experience working with Java/C# Experience with JavaScript Experience working in capital markets finance Experience with performance testing   If this sounds like you then please do not hesitate to reach out!

C#, WPF, .NET Developer - Hybrid - Outside IR35 - 12 month contract C#, WPF, .NET Developer is required by global company for an initial 12-month contract. The successful candidate will have experience with detailed design, development, implementation, integration, and testing of software in C# to build windows/web-based applications. The ideal contractor would have experience in software development in C# (.NET Core 2.1+, .NET Framework 4.6+) and Visual Studio 2022. Experience in WPF, user interface design and MVC/MVVM design patterns. Experience with connecting to and consuming RESTful web services. Experience with generic design-patterns (Dependency Injection, Inversion of Control and similar) and .NET Frameworks (MVVM, WPF, MEF, Entity Framework) in the construction of large and complex software applications. Experience of using version control (GIT), change control and code quality control/review processes. Experience of working in SCRUM...

JWT / JSON Developer Location: London - Hybrid / 2 days per week onsite Contract Length: 6 months Day Rate: Up to £650 a day (Outside IR35) We're supporting a leading UK financial services organisation in the search for an experienced JWT / JSON Developer to join a high-performing engineering team on an initial 6-month contract. This role will focus on authentication, authorisation and secure service-to-service communication across a large-scale digital platform. You'll be working on OAuth 2.0 and OpenID Connect (OIDC) implementations, JWT-based authentication, and integrations with identity providers within a modern cloud-native environment. Key Responsibilities Develop and maintain authentication and authorisation services Implement OAuth 2.0 and OIDC integrations with identity providers Work with JSON Web Tokens (JWTs), including issuance, validation, signing and key management Contribute to CI/CD pipelines and trunk-based delivery practices...

JWT/JSON Developer Location: London - Hybrid/2 days per week onsite Contract Length: 6 months Day Rate: Up to £650 a day (Outside IR35) We're supporting a leading UK financial services organisation in the search for an experienced JWT/JSON Developer to join a high-performing engineering team on an initial 6-month contract. This role will focus on authentication, authorisation and secure service-to-service communication across a large-scale digital platform. You'll be working on OAuth 2.0 and OpenID Connect (OIDC) implementations, JWT-based authentication, and integrations with identity providers within a modern cloud-native environment. Key Responsibilities Develop and maintain authentication and authorisation services Implement OAuth 2.0 and OIDC integrations with identity providers Work with JSON Web Tokens (JWTs), including issuance, validation, signing and key management Contribute to CI/CD pipelines and trunk-based delivery practices Write and review...

JWT / JSON Developer Location: London - Hybrid / 2 days per week onsite Contract Length: 6 months Day Rate: Up to £650 a day (Outside IR35) We 're supporting a leading UK financial services organisation in the search for an experienced JWT / JSON Developer to join a high-performing engineering team on an initial 6-month contract. This role will focus on authentication, authorisation and secure service-to-service communication across a large-scale digital platform. You 'll be working on OAuth 2.0 and OpenID Connect (OIDC) implementations, JWT-based authentication, and integrations with identity providers within a modern cloud-native environment. Key Responsibilities Develop and maintain authentication and authorisation services Implement OAuth 2.0 and OIDC integrations with identity providers Work with JSON Web Tokens (JWTs), including issuance, validation, signing and key management Contribute to CI/CD pipelines and trunk-based...

Senior Java Developer - Outside IR35 - Up to £700 per day We have partnered with a leader in the financial services sector who is looking for experienced Senior Java Engineers to join their Settlements team . This is a hands-on engineering role focused on developing and enhancing software supporting complex post-trade and settlement workflows . you'll work as part of an experienced engineering team, contributing to both new and existing systems within a fast-moving financial markets environment. The Role Develop and maintain Server Side Java/JVM applications supporting settlement and post-trade processes. Build robust, scalable services using Spring and Spring Boot . Work across greenfield and brownfield development projects. Collaborate with engineers and business stakeholders to understand requirements and deliver effective solutions. Contribute to technical design, development, testing and production delivery. Work with Kubernetes, event-driven...

My client, a Global Supply Chain organisation are looking to recruit an experienced Blue Yonder WMS Developer for an initial 6 month contract to start ASAP.   Key Responsibilities: Develop, configure, and deploy Blue Yonder WMS customisations and integrations in line with business requirements and best practices. Code quality, documentation, and solution design. Perform enhancements, upgrades, and system configuration within the Blue Yonder MOCA architecture. Design and implement WMS reports, interfaces, and data extracts using SQL and related tools. Conduct thorough unit testing to ensure solution quality and performance. Participate in system upgrades, patches, and version migrations, ensuring minimal disruption to business operations. Produce and maintain comprehensive technical documentation, including functional specifications, configuration records, and operational procedures. Provide second and third-line support for Blue Yonder WMS...

WE ARE: At Adaptive, we are a financial consulting firm that partners with capital, commodity, and digital market participants. We value differentiation through technology. Our experienced teams design and deliver complex front-office technology solutions using our proven accelerators to create long-term competitive advantage. Our clients include the world's leading investment banks, investment managers, fintechs and capital market service providers. With a global reach with offices in London, New York, Barcelona, Montreal and Manila, we have a proven track record delivering powerful, elegant and intuitive trading technology solutions. We are expanding our product capability and looking for talented individuals to help build transformational capital markets products including: Aeron - our flagship high-performance messaging infrastructure. Hydra - our developer framework for accelerating the development and delivery of trading systems. Artio - our market-leading...

J ob Title: Python Engineer Location: UK Based - Fully Remote Salary/Rate: Up to £175 Daily Outside IR35 Start Date: In the next two weeks Job Type: Initial 6 month contact Company Introduction We have an exciting opportunity now available with one of our sector-leading consultancy clients! They are currently looking for a Python Engineer to join their team for an initial six-month contract. Job Summary: We are seeking a dynamic and passionate Python Developer to join our innovative software development team. In this role, you will be instrumental in designing, developing, and maintaining scalable applications that drive our core business operations. Your expertise will help shape the future of our technology solutions, ensuring high performance, security, and seamless integration with various platforms and services. This position offers an exciting opportunity to work with cutting-edge tools and technologies in a fast-paced environment committed to excellence...

My client, a Global Supply Chain organisation are looking to recruit an experienced Blue Yonder WMS Developer for an intial 6 month contract to start ASAP. Key Responsibilities: Develop, configure, and deploy Blue Yonder WMS customisations and integrations in line with business requirements and best practices. Code quality, documentation, and solution design. Perform enhancements, upgrades, and system configuration within the Blue Yonder MOCA architecture. Design and implement WMS reports, interfaces, and data extracts using SQL and related tools. Conduct thorough unit testing to ensure solution quality and performance. Participate in system upgrades, patches, and version migrations, ensuring minimal disruption to business operations. Produce and maintain comprehensive technical documentation, including functional specifications, configuration records, and operational procedures. Provide second and third-line support for Blue Yonder WMS incidents and change...

Senior C# Developer - Investment Banking £750/day | Outside IR35 | 12-month rolling contract | Largely Remote If you're a strong C# engineer with genuine Event Sourcing experience and interested in a long term banking project, get in touch I'm working with a leading investment bank looking for a strong Senior C# Developer to join a long-term project building and enhancing a large-scale Structured Notes platform. This is a hands-on engineering role with approximately 80% Back End C#/20% frontend, working on complex, distributed systems. The role: You'll be working across a modern .NET platform, designing and developing scalable Back End services while contributing to the Angular Front End where required. The environment involves large-scale distributed systems, asynchronous processing, Multithreading and event-driven architecture. Core technical requirements: Excellent C#/.NET development experience Strong .NET 8 knowledge Previous commercial Event...

Senior DevSecOps Engineer AWS | EKS | Platform Security | Financial Services ?? Location: London/Hybrid ?? Day Rate: Up to £650 (OUTSIDE IR35) ?? Contract: Initial 6 Months We're supporting a major financial services organisation delivering a next-generation cloud platform that will underpin multiple strategic programmes and engineering teams. As a result, we're looking for a hands-on DevSecOps Engineer to join the platform security function and help build the guardrails, controls and automation that allow product and engineering teams to scale securely by default. This is an engineering-first role focused on AWS, Kubernetes, CI/CD security and platform protection. You'll work alongside Platform Engineering, Developer Platform and Security Architecture teams to ensure security is Embedded into the platform rather than bolted on afterwards. What You'll Be Doing Engineering and maintaining security controls across a multi-tenant AWS platform Implementing and...

Senior DevSecOps Engineer AWS | EKS | Platform Security | Financial Services Location: London/ Hybrid Day Rate: Up to £650 (OUTSIDE IR35) Contract: Initial 6 Months We 're supporting a major financial services organisation delivering a next-generation cloud platform that will underpin multiple strategic programmes and engineering teams. As a result, we 're looking for a hands-on DevSecOps Engineer to join the platform security function and help build the guardrails, controls and automation that allow product and engineering teams to scale securely by default. This is an engineering-first role focused on AWS, Kubernetes, CI/CD security and platform protection. You 'll work alongside Platform Engineering, Developer Platform and Security Architecture teams to ensure security is embedded into the platform rather than bolted on afterwards. What You 'll Be Doing Engineering and maintaining security controls across a multi-tenant AWS...

🚀 Senior C# Developer – Investment Banking £750/day | Outside IR35 | 12-month rolling contract | Largely Remote I’m working with a leading investment bank looking for a strong Senior C# Developer to join a long-term project building and enhancing a large-scale Structured Notes platform . This is a hands-on engineering role with approximately 80% backend C# / 20% frontend , working on complex, distributed systems. The role: You’ll be working across a modern .NET platform, designing and developing scalable backend services while contributing to the Angular frontend where required. The environment involves large-scale distributed systems, asynchronous processing, multithreading and event-driven architecture. Core technical requirements: • Excellent C# / .NET development experience • Strong .NET 8 knowledge • Previous commercial Event Sourcing experience – essential • Strong understanding of multithreading, concurrency and asynchronous...

Senior Java Developer - Outside IR35 - Up to £700 per day A leading organisation in the financial services sector is looking for experienced Senior Java Developers to join its engineering teams, working on bespoke software solutions across complex financial markets environments. This is a hands-on development role, with a strong focus on server-side Java/JVM , working across greenfield and brownfield projects. You'll need to be comfortable working with ambiguity, taking ownership and delivering solutions in a fast-moving environment. The Role Develop server-side Java/JVM applications across financial services and trading environments. Work across the full software development lifecycle, from technical design through to implementation and production. Work with Linux, Kubernetes, event-driven architecture and cloud infrastructure . Collaborate with engineering teams and stakeholders to solve complex technical problems. Take ownership of issues and drive them...

A leading business is hiring a Agentic AI Developer. Hybrid position. 12-month rolling contract, paying up to £1000 per day, depending on experience. Experience and skills required for the Agentic AI Engineer, Agentic AI Developer, Python Fluency with modern ML toolchains (PyTorch/JAX, agentic frameworks, MCP). Experience with AI agent ecosystems using frameworks such as LangChain, AutoGen, CrewAI, and Semantic Kernel. Solid software-engineering fundamentals - tested, documented, maintainable Python Familiarity with libraries such as TensorFlow, PyTorch, LangChain, or Ray is a plus. Exposure to Knowledge Graphs (Neo4j / RDF / graph-based enrichment or retrieval). Experience with either Docker, Kubernetes, cloud (AWS / Azure) Experience integrating LLM APIs (OpenAI or similar), with prompt design and orchestration. Hands-on experience training and deploying learned policies for complex behaviours in robots or simulated characters is a bonus Ability to write...