3 back end engineer jobs found in London

Senior Software Engineer - Kotlin £550-£650 per day | Outside IR35 Hybrid | London (3 days onsite) A leading UK financial services organisation is seeking a Senior Software Engineer to play a central role in a large-scale platform transformation programme. The business is rebuilding a critical part of its digital infrastructure to support a broad range of transaction methods and channels across both in-person and digital environments. This is hands-on Back End engineering at scale, with real ownership and direct exposure to architecture decisions from day one. Key Responsibilities as a Senior Software Engineer: Design and build Kotlin Back End services for a new payments platform Own the architecture and design of key components, taking high-level requirements and turning them into structured, deliverable backlogs Write clean, well-tested, production-ready code that the team can rely on Work closely with Product and Engineering to break down complex...

AI Integration Engineer (Defence & National Security) Location: London (Hybrid) Contract Rate: £600/day (Outside IR35) Requirement: Active UK SC Clearance (Mandatory) We are hiring on behalf of our client, a specialised defence consultancy, who is looking for an AI Integration Engineer with active SC clearance to join them on a contract basis in London. Key Skills Required Active UK SC Clearance (Mandatory - applications without this cannot be considered) Core Engineering: Strong Back End development skills (Python, Go, or C++) with solid API design and data pipeline experience AI Tooling: Hands-on experience integrating LLMs, handling vector databases, and building robust chunking/embedding strategies Secure Architecture: Deploying LLM pipelines, RAG systems, and orchestration layers within secure, classification-bound environments Local Implementations: Self-hosting, optimising, and containerising open-source models (eg, Llama,...

🚨 Senior Playwright SDET | £700/day | Outside IR35 | Front Office Trading | London I'm working with a leading global investment bank looking to hire an exceptional Playwright SDET to join their Front Office Derivatives Technology team. This isn't your typical automation role. You'll be embedded within a high-performing engineering team, working directly alongside developers on a strategic front end trading platform. The rate reflects the calibre of engineer they're looking for. 💰 Package £700 per day Outside IR35 12-month rolling contract 1 day per week in the London office What they're looking for This role is suited to a highly technical SDET who is passionate about automation and enjoys writing production-quality code. You must have: ✅ Strong commercial experience with Playwright ✅ Excellent coding skills in JavaScript and TypeScript ✅ Experience building and maintaining automation frameworks ✅ Previous experience working on...