senior java full stack developer jobs in London

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Calyptus is looking for a Senior Full Stack Engineer in the UK to lead the technical architecture of their platform. Responsibilities include owning the full stack from React Native to Django API and managing the engineering team. Applicants should have 7+ years of experience, strong skills in React Native and Python/Django, and the ability to architect...

Project Global Limited is seeking a Senior Software Developer with Active SC Clearance to join our client’s team in the UK. The role is hybrid with office attendance 1-2 days per week in London, Newcastle, Leeds, Manchester, Blackpool or Sheffield, and remote work within the UK.The contract is 12 months and day rate is competitive. You will work in a...

Belitsoft is seeking a Senior .NET Engineer in Greater London. The role involves writing modular and scalable code, ensuring code quality, and collaborating with a diverse team. Candidates should have strong proficiency in PHP (Laravel), React, and experience with PostgreSQL and Docker, along with the ability to deploy solutions to AWS. This position fosters...

Fitch Ratings in London is seeking a Senior Software Engineer to lead and shape front-to-back applications within Ratings Technology. You will craft mission-critical full-stack solutions and influence architectural direction.The role emphasizes AI exploration, collaboration with product teams, and delivering high-quality user experiences at scale, with...

IFS is seeking a senior software engineer to design, build, and own scalable cloud-native systems. You will work across the stack, shaping API-first architectures and AI-enabled features that drive sustainability initiatives and ESG data capabilities.You will lead technical discussions, mentor engineers, and partner with Product, Design, AI, and Platform...

Accenture, based in London, seeks a Senior AI Native Software Engineer to lead end-to-end product development across full stack, with a strong emphasis on AI-native systems and firm engineering discipline. The role requires extensive experience in production software and AI tooling, with collaboration across product, design, and client teams.You will own...

Experis in London/Remote is seeking a Quality Engineer - FullStack to lead testing strategy and raise software quality across releases. This 12-month umbrella contract provides a flexible London/remote setup, with responsibilities focused on defining standards and guiding release decisions.You will work across teams to ensure testing is practical,...

BNY is seeking a Senior Associate, Full-Stack Engineer in London. In this role, you will design and maintain backend services while collaborating on frontend development. Key responsibilities include delivering secure, scalable systems and contributing to performance enhancements.Required qualifications include proficiency in Java, knowledge of...

The Signal Group in Greater London is seeking a Senior Full Stack Engineer to join our expanding engineering team. The ideal candidate will have extensive experience in React, C#, and Azure, alongside a strong understanding of Agile methodologies. This hybrid work role offers the opportunity to work closely with data science and product teams to develop...

Oho Group in London is seeking a skilled Full-Stack + Agentic AI Engineer to join a growing startup. You will own systems end-to-end, from backend services to frontend features, and directly influence real-world infrastructure.With 3+ years in full-stack and agentic AI, you will work with founders to ship production-grade software, contributing to...

Spotify is seeking a Senior Fullstack Engineer to join Groove, a platform that enables planning, collaboration, and execution across the company. You will build end-to-end features across frontend and backend, using React, TypeScript, Java, GraphQL, PostgreSQL, and Google Kubernetes Engine (GKE).You will work with product managers and designers to translate...

Vialto, based in Greater London, is seeking a Senior Full Stack Engineer to design and develop scalable products for global payroll and compensation solutions. This role involves hands-on engineering across Next.js, React, C#, and .NET, focusing on compliance in a multi-jurisdictional environment.The ideal candidate should have over 5 years of experience in...

Harvey Nash Group is seeking a Senior Full-Stack Engineer in London to co-lead architecture and build data-driven products for sales, account management, and customer success teams. You will work with Python, TypeScript, AWS, and Terraform across web portals, document generation, and cloud apps processing billions of records.You'll mentor teammates,...

Harnham is partnering with a high-growth international technology business to join the platform engineering team. You will own projects from design through to production, rebuild core services, and mentor colleagues while driving modernisation efforts across the platform.Based in London, you will design, build and maintain backend services, APIs and web...

Conveo.ai is building an AI research platform used by global brands. We seek a Senior Product Engineer who owns the full stack from interface to infrastructure, shaping product direction with technical impact.You’ll lead frontend architecture in React/TypeScript, design robust APIs, and ship complete features including AI-powered capabilities on AWS/GCP,...

Harnham - Data and Analytics Recruitment is seeking a Senior Full Stack Engineer to join a hybrid London-based team. You will build AI agents, develop prototypes, and modernise legacy systems, delivering measurable results across the data platforms.You’ll work with Python, TypeScript, and SQL in a fast-paced environment, collaborating with senior...

Octopus Electric Vehicles, part of the Octopus Energy Group, is hiring a Senior Fullstack Software Engineer (Python & React) to join our product and engineering team in the UK. You’ll build APIs, develop frontend experiences, and create scalable systems powering our electric car leasing platform.You’ll work with Python, GraphQL, React/Next.js, PostgreSQL...

Fresha in London is seeking a Senior Full Stack Engineer to join our cross-functional team. You’ll own features end-to-end, from the React/TypeScript UI to the GraphQL/API layer and backend services, in a fast-paced environment.You’ll contribute to AI-enabled workflows, ship daily behind feature flags, and collaborate with product, design, frontend,...

Capgemini is hiring a Senior Full Stack Engineer with a focus on AI/ML to lead by example and deliver high-quality software. The role blends hands-on development with stakeholder partnership and setting engineering standards.The position emphasizes frontend ReactJS/TypeScript, strong backend API design, DevOps, and practical AI feature integration. It offers...