31 software engineer jobs found in London, greater london

Senior Software Engineer - APIs & Integration (Azure & Kafka) Contract Length: 6 months Initial Rate: £500-£525 per day Location: Remote IR35: Outside We're supporting a major cloud transformation programme and are looking for an experienced API Architect to help modernise a critical enterprise platform. This role is focused on transforming a large API estate, migrating services from on-premise infrastructure into Azure, and evolving a monolithic architecture into a modern, scalable, event-driven ecosystem. This is a hands-on architecture role where you'll work closely with engineering teams to define architectural standards, guide implementation, and support the delivery of a long-term modernisation strategy. The Opportunity You'll play a key role in: Leading the migration of business-critical APIs from on-premise environments into Azure Defining and driving API architecture across a complex technology landscape Decomposing a large API monolith into...

Software Engineer (Golang) - Contract 6 months initial | Outside IR35 | Remote (occasional travel to Manchester/London) | BPSS required Client: Pixel Global (DWP) We're looking for a Golang Software Engineer to drive automation and process optimisation across a major government programme What you'll be doing: Building in Golang, creating frameworks to enable scalable automation Working with stakeholders to pilot and embed repeatable automated processes Shaping automation approaches aligned to defined standards (TS Red Lines) Challenging manual processes and identifying where automation adds real value What we need: Strong Golang development experience Experience building automation frameworks or tooling Confident engaging stakeholders and challenging existing processes Ability to assess automation vs manual trade-offs This is an immediate impact role with strong extension potential beyond 2026. Please click on the link to apply, for consideration.

Software Engineer (Golang) - Contract 6 months initial | Outside IR35 | Remote (occasional travel to Manchester / London) | BPSS required Client: Pixel Global (DWP) We 're looking for a Golang Software Engineer to drive automation and process optimisation across a major government programme What you 'll be doing: Building in Golang, creating frameworks to enable scalable automation Working with stakeholders to pilot and embed repeatable automated processes Shaping automation approaches aligned to defined standards (TS Red Lines) Challenging manual processes and identifying where automation adds real value What we need: Strong Golang development experience Experience building automation frameworks or tooling Confident engaging stakeholders and challenging existing processes Ability to assess automation vs manual trade-offs This is an immediate impact role with strong extension potential beyond 2026. Please click on the...

Senior Software Engineer | :£950/day Outside IR35 | 6-months initial contract | London Industry: Trading Location: London - 4 days in office Job Type: Contract - 6-month initial Our client is building the next generation of execution and order management (EMS/OMS) infrastructure for global commodities trading. You will join a small, fast-moving engineering team designing and delivering a cloud-native trading platform from the ground up, tightly integrated with risk, pricing, and market data systems to support high-performance trading environments. This is a senior, hands-on role for an engineer who wants end-to-end ownership — from low-level protocol integration through to distributed execution services and trader-facing tooling. What You’ll Be Doing Design and build core components of a modern EMS/OMS platform, including order routing, order lifecycle management, venue connectivity, and execution analytics. Implement and maintain FIX protocol and...

C + + Software Engineer - Outside IR35 Contract London, UK Long-Term Engagement on a Rolling Contract Hybrid Working Up to £750 per day (Outside IR35) We have partnered with a leading Technology Firm who are looking to add a Software Engineer with skills on C + + to their Market Data team! The succesful candidate will have experience in Financial Markets Technology and realtime market data expertise. It 's a Front Office position so you must be comfortable speaking with Portfolio Managers, Traders, C-Suite etc... Responsibilities will include : Architecture and Implementation of Low Latency C + + systems (robust, resilient, accurate, stable and fast) - by doing this you will position the client as a leader in Quant Trading. Work alongside hardware and software teams to build realtime market data processing. Define, implement and enforce SLAs, policies and metrics to monitor the area. Develop Systems,...

C + + Software Engineer - Outside IR35 Contract London, UK Long-Term Engagement on a Rolling Contract Hybrid Working Up to £750 per day (Outside IR35) We have partnered with a leading Technology Firm who are looking to add a Software Engineer with skills on C + + to their Market Data team! The succesful candidate will have experience in Financial Markets Technology and realtime market data expertise. It 's a Front Office position so you must be comfortable speaking with Portfolio Managers, Traders, C-Suite etc... Responsibilities will include : Architecture and Implementation of Low Latency C + + systems (robust, resilient, accurate, stable and fast) - by doing this you will position the client as a leader in Quant Trading. Work alongside hardware and software teams to build realtime market data processing. Define, implement and enforce SLAs, policies and metrics to monitor the area. Develop Systems,...

🚀 𝗦𝗲𝗻𝗶𝗼𝗿 𝗔𝗜 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿 / 𝗔𝗜 𝗧𝗲𝗰𝗵 𝗟𝗲𝗮𝗱 - 𝗖𝗹𝗮𝘂𝗱𝗲 I𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 🚀 📍 London (Hybrid) 📅 Start Date: ASAP ⏳ Initial 3-6 Months (multiple contracts) 💰 Outside IR35 - rate depending on experience I'm working with a consultancy delivering multiple AI engineering engagements for enterprise clients looking to accelerate software delivery through AI-native engineering practices. We're looking for experienced engineers who have worked hands-on with Claude Code and can help engineering teams adopt AI-assisted development at scale. 🔑 The Role 👉 Roll out Claude Code across engineering organisations and delivery teams 👉 Build custom agents and AI-powered workflows to improve software delivery 👉 Embed alongside engineering teams to drive adoption and best practice 👉 Accelerate technical design, code review, testing and SDLC processes 🎯 Requirements 👉 Strong Software Engineering background 👉 Excellent Python experience 👉 Hands-on experience with Claude Code,...

I have partnered with a top-tier business intelligence provider who are looking for a Senior .NET/Angular contractor to help them out over their next few sprints. 💷 Up to £500 per day (Outside IR35) 🏢 once a week in London office (mandatory) 📅 3 initially with possibility of extension 🧐 Focus: working on highly performant web apps ad backend systems as well as integration across multiple services and databases. ⚙️ Skills: Angular, .NET Core 7/8, API development, MongoDB, MySQL, Entity, AWS, Claude & Cursor 👉 Advantageous skills: knowledge of Python/Gen AI application and database deployment ❗ Must have UK right to work and be able to commute to London once a week.

🚀 Job Opportunity: Senior C# Quantitative Risk Developer | Capital Markets Technology Location: London Type: Full-time / Contract Rate: £800 p/d (Outside IR35) Client: Leading Global Investment Bank Hybrid: 1 day per week in the office Are you ready to be at the forefront of technology and finance? Our client, a top-tier investment bank, is looking for a Senior C# Quantitative Risk Developer to join their high-impact Capital Markets Technology team in London. This is a unique opportunity to bridge the worlds of quantitative analysis and software engineering—delivering cutting-edge solutions to drive pricing, risk management, and liquidity strategies in real-time trading environments. 🔍 About the Role As a Senior Quantitative Developer, you’ll collaborate closely with quantitative analysts, traders, and fellow technologists to develop and optimize core components of the bank’s pricing, risk and valuations infrastructure. You'll be responsible for...

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...

Senior Java Developer / AI Engineer - Design & Build Payment Product / Fintech / Banking. Spring Boot, Claude/Codex also essential. ANY PAYMENT PRODUCT CONSIDERD from Current Account OR SAVINGS OR ISA's OR Fixed Term Deposits, Lending etc. £600-£650/DAY OUTSIDE IR35 PAY. Our Fintech Challenger Bank client based in Central London seeks a dynamic, eager to learn and technically astute Java Software Engineer who has extensive experience in Designing & Building a Payment Product *NOT PAYMENT PLATFORM* so the ideal candidate will come from for e.g. a Challenger Bank or Fintech Payment Product Company. STRONG skills in Java, Spring Boot, AI (Claude or Codex), working in a Fintech Payment domain. YOU WILL NOT BE CONSIDERED IF YOU DO NOT HAVE FINTECH & DESIGN & BUILD PAYMENT PRODUCT EXPERIENCE WITH JAVA, SPRING & STRONG AI! Our client is hiring a hands-on SENIOR Software Engineer / Java Developer to support delivery and development of Savings products...

Tech Lead - Python/Financial Modelling/AI - Pensions £650 - £750 per day Outside IR35 6 Month Contract Remote (Occasional London Travel) Overview I'm currently working with a leading financial services technology consultancy that is looking to bring in an experienced Tech Lead to support the delivery of modern software solutions for a major pensions client. This role sits at the intersection of financial modelling and modern engineering, supporting the development of platforms used for forward-looking financial analysis, including discounted cashflow projections and Monte Carlo simulations. This is a hands-on leadership role, splitting your time between full-stack engineering and leading a team of senior developers. You'll also play a key role in shaping AI-assisted and agentic development workflows, helping embed these approaches into day-to-day engineering practices. The Role You will lead a team of four experienced engineers while remaining actively involved in the...

Tech Lead - Python / Financial Modelling / AI - Pensions £650 - £750 per day Outside IR35 6 Month Contract Remote (Occasional London Travel) Overview I'm currently working with a leading financial services technology consultancy that is looking to bring in an experienced Tech Lead to support the delivery of modern software solutions for a major pensions client. This role sits at the intersection of financial modelling and modern engineering, supporting the development of platforms used for forward-looking financial analysis, including discounted cashflow projections and Monte Carlo simulations. This is a hands-on leadership role, splitting your time between full-stack engineering and leading a team of senior developers. You'll also play a key role in shaping AI-assisted and agentic development workflows, helping embed these approaches into day-to-day engineering practices. The Role You will lead a team of four experienced engineers while...

Hands-On Software Developer (Contract) | Outside IR35 London or Dublin | Hybrid (2-3 Days Onsite per Week) Initial 3-6 Month Contract + chance for extension Competitive Day Rate | Outside IR35 Immediate Start A leading consultancy is seeking a Hands-On Software Developer to support the delivery of a strategic integration platform on behalf of a global insurance and reinsurance organisation. This is an opportunity for an experienced software engineer who enjoys building robust, scalable solutions and working across the full technology stack. Working within a Microsoft technology stack across both on-premise and Azure-hosted environments, you will collaborate closely with architects, developers, QA engineers, and data platform specialists to design, build, and deploy high-quality software to demanding engineering standards. Software Developer Key Responsibilities: Design and develop components that receive messages from...

Senior Data Engineer Location: London (Hybrid Working) Type: Contract Pay Rate: £350-£400 (Outside IR35) We're looking for a Senior Data Engineer to join a high-performing data team responsible for delivering scalable, reliable, and innovative data solutions that power analytics and decision-making across a global streaming and digital ecosystem. This is an opportunity to work with modern cloud technologies, large-scale datasets, and a collaborative engineering culture where you'll help shape the future of data platforms used by millions of customers worldwide. What You'll Be Doing Design, build, and support scalable data models and distributed ETL pipelines using modern big data technologies. Collaborate with stakeholders across multiple business functions to understand data challenges and translate requirements into robust technical solutions. Champion DataOps principles, engineering best practices, and continuous improvement initiatives....

Lead Platform Engineer Python | Cloud | Terraform | IAM | DevOps | Infrastructure-as-Code (IaC) Rate: Circa £700–£800 per day (Outside IR35) Contract Length: 6 Months Location: London / Hybrid (2 days per week) Overview We are seeking an experienced Principal / Lead Engineer to join a highly ambitious organisation building a large-scale, mission-critical data and technology platform. This is a unique opportunity to join at the earliest stages of a major programme and play a key role in shaping its technical foundation. Working closely with the CTO and a small team of senior engineers, you will lead the design and implementation of core infrastructure, establish engineering standards and practices, and make architectural decisions that will have long-term strategic impact. If you enjoy solving complex technical challenges, influencing technology strategy, and creating robust engineering foundations, this role offers an exceptional opportunity to make a...

AI Architect | Contract | 6 Months | £400/day | Outside IR35 | Remote (UK Based) Start straight away The Opportunity A leading enterprise AI services firm is looking for a hands-on AI Architect to define and deliver next-generation GenAI and agentic AI platforms across a global client base. You 'll own end-to-end architecture across Azure AI Foundry, Databricks, and AWS - from discovery through production - and act as a trusted technical voice in pre-sales, CXO conversations, and partner co-innovation. Rate: £400/day Duration: 6 months IR35: Outside Location: Remote (UK based candidates only) What You 'll Be Doing Designing reference architectures and platform standards for repeatable, scalable client delivery Architecting production-grade GenAI platforms on Azure AI Foundry - RAG, copilots, and multi-agent systems Building Lakehouse-based AI platforms using Databricks, Mosaic AI, MLflow 3.0, and Unity Catalog Designing...

Leading eCommerce client now requires a DevOps Engineer to design and deploy infrastructure which will support the development of features across their cloud estate. Key Responsibilities: Support the wider development teams with designing and deploying infrastructure for new feature development. Performing code reviews with other DevOps engineers. Support and maintain development tooling and systems. Work on large security and infrastructure projects. Key Requirements: Strong experience designing, deploying and operating production workloads on AWS. Previous experience running both Docker and Kubernetes (EKS) in production. Infrastructure as code (Terraform). Strong experience with a coding language such as Python, Bash and PowerShell. Strong understanding of the full software development lifecycle. Experience working in autonomous agile team. Awareness of security best practices in both software and infrastructure development. This is a 6-month...

Senior AI Engineer | Agentic AI / Machine Learning | UK | Contract Conquer AI is hiring Senior AI Engineers. We’re looking for hands-on engineers who can build practical AI systems that solve real operational problems for enterprise clients. This is an Outside IR35 contract working on greenfield AI projects for enterprise clients. This is not a pure ML research role. It’s applied, product-minded, and delivery-focused. You’ll work on systems that extract information, reason over documents, automate workflows, connect into business tools, support decision-making, and reduce manual effort for client teams. You’ll be close to clients, close to the problem, and close to the code. What you’ll work on: Agentic AI workflows LLM-powered applications RAG and knowledge systems Document extraction and classification Workflow automation API and system integrations Client-facing prototypes and production builds Internal Conquer AI product development What...

Senior AI Engineer (LLM/Agentic AI) | London (Hybrid) | £600–£700/day | Outside IR35 | 6 months Role: Senior AI Engineer (LLM/Agentic AI) Location: London (Hybrid – 1 day per week onsite in Victoria) Rate: £600–£700 per day IR35 Status: Outside IR35 Duration: 6 months (extension likely) Project Overview You'll join a major AI transformation programme within a global organisation focused on building production-grade AI systems at scale. The initiative spans both customer-facing AI products and internal business transformation, with a strong emphasis on delivering systems that are deployed, used, and continuously improved. We're seeking a Senior or Lead Machine Learning Scientist to design, build, and deploy AI agents and LLM-powered systems in real-world production environments. The team is building next-generation AI solutions using Large Language Models, Agentic AI, Retrieval-Augmented Generation (RAG), and intelligent automation to...