9 senior full stack java react engineer jobs found in London

Role: Senior Full Stack Engineer London 1x a week Rate: Up to £600 per day - Outside IR35 Length: 6 Months (Good chance of extension) About the Role We are seeking a Senior Java / React Full Stack Developer to join our client on a contract basis as a hands-on engineering consultant within a Solutions Engineering team. This role centres on modernising large-scale, complex software systems, reducing technical debt, and improving delivery speed and reliability. You will work closely with client engineering teams, alongside platform and test engineers, helping to introduce modern development practices and AI-assisted engineering techniques to enhance productivity. You will report to a Principal Software Engineer and play a key role in promoting and embedding best practices within delivery teams. About You You are an experienced, hands-on Java/React developer who enjoys working on complex systems and influencing how software is designed, built, and evolved....

Role: Senior Full Stack Engineer London 1x a week Rate: Up to £600 per day - Outside IR35 Length: 6 months (Good chance of extension) About the Role We are seeking a Senior Java/React Full Stack Developer to join our client on a contract basis as a hands-on engineering consultant within a Solutions Engineering team. This role centres on modernising large-scale, complex software systems, reducing technical debt, and improving delivery speed and reliability. You will work closely with client engineering teams, alongside platform and test engineers, helping to introduce modern development practices and AI-assisted engineering techniques to enhance productivity. You will report to a Principal Software Engineer and play a key role in promoting and embedding best practices within delivery teams. About You You are an experienced, hands-on Java/React developer who enjoys working on complex systems and influencing how software is designed, built, and evolved. You bring:...

Role: Senior Full Stack Engineer London 1x a week Rate: Up to £600 per day - Outside IR35 Length: 6 Months (Good chance of extension) About the Role We are seeking a Senior Java / React Full Stack Developer to join our client on a contract basis as a hands-on engineering consultant within a Solutions Engineering team. This role centres on modernising large-scale, complex software systems, reducing technical debt, and improving delivery speed and reliability. You will work closely with client engineering teams, alongside platform and test engineers, helping to introduce modern development practices and AI-assisted engineering techniques to enhance productivity. You will report to a Principal Software Engineer and play a key role in promoting and embedding best practices within delivery teams. About You You are an experienced, hands-on Java/React developer who enjoys working on complex systems and influencing how software is designed, built, and...

Senior Full Stack Engineer | Java | React | Outside IR35 Java | React | Modernisation | DDD | Microservices | AI-Assisted Engineering SR2 is supporting a consultancy-led delivery engagement focused on modernising large, complex software estates. This role suits a senior, hands-on Full Stack Developer who enjoys working closely to clients, reducing technical debt, and improving engineering practices across delivery teams. You'll operate as a consulting engineer within a multi-disciplinary environment, helping teams move faster and more safely through modern development approaches, tooling, and AI-assisted engineering techniques. The Role This is a hands-on senior engineering role, focused on modernising Java/React applications, improving developer productivity, and guiding teams toward better architectural and delivery outcomes. You'll work closely with platform, test, and client engineering teams, while reporting into a Principal Engineer and influencing technical...

Full job description As part of our Software Engineering team, you’ll join a well-established and highly regarded organisation, working on solutions that serve millions of customers and thousands of colleagues. Guided by strong ethical values and supported by technology leaders who genuinely understand engineering and engineers, this is an exciting time as we continue our journey to becoming a digital-first, engineering-led organisation. The quality of our engineering team is a key differentiator and central to our success. We are seeking a passionate Software Engineering Manager who brings strong technical expertise, delivers with care, and operates with excellence. Creative, curious, and confident, you will be an integral member of empowered, self-managing, multidisciplinary teams—designing, building, releasing, and maintaining high-quality products. You will play a pivotal role in shaping a best-in-class engineering team, environment, and culture....

Contract Location: London (Hybrid - 1 day per month onsite) Day Rate: Up to £600 per day, Outside IR35 Duration: 6 months with view to extend Industry: Consultancy SC Eligibility Required About the Client Our client is a specialist cloud and software engineering consultancy that helps organisations modernise how they build, deploy and operate software. Working across both public and private sectors, they partner closely with engineering teams to reduce technical debt, improve developer experience, and deliver resilient, scalable systems using modern engineering practices. With a strong focus on cloud platforms, modern application delivery and long-term system evolution, this is an organisation known for its high engineering standards, collaborative culture, and meaningful work on complex, business-critical systems. How you'll spend your day As a Senior Java / React Full Stack Developer contractor ,...

🚀 Senior Front-End Engineer – Investment Banking |£750 p/d (Outside IR35) | London / Hybrid (1 Day/Week in Office) We are partnering with a global investment bank to hire a Senior Front-End Engineer to join a flagship team delivering a next-generation, single-page application (SPA) platform for high-performance derivatives trading. This is a high-profile role on a mission-critical, front-office system with exceptional technical standards. You’ll work at the cutting edge of financial technology, contributing to a modern, reactive web platform used across trading desks. This is not your typical enterprise UI, it’s fast, data-intensive, and built to scale with real-time demands in a trading environment. 💼 The Opportunity Collaborate with elite engineers on a SPA used across the investment bank for derivatives trading. Build elegant, high-performance UIs with real-time data updates and functional programming paradigms. Shape a front-end architecture trusted...

Senior Java/React Full Stack Developer Location: London or Newcastle, UK (Hybrid - ~1 day per week in office / onsite) Contract: Contract - 6 months with view to extend Day Rate: £550–£600 per day - Outside IR35 About Appvia Appvia is a specialist cloud, platform, and solutions engineering consultancy. We help organisations modernise software systems, improve developer productivity, and adopt cloud-native practices that enable long-term, sustainable delivery. Our software engineering work focuses on modern application development, domain-driven design, and improving delivery outcomes through better architecture, testing, and developer experience. About the Role We are looking for a Senior Java/React Full Stack Developer to join Appvia on a contract basis, working as a hands-on engineering consultant within our Solutions Engineering team. This role is focused on modernising large, complex software systems, reducing technical debt, and improving delivery speed...

Senior Java/React Full Stack Developer Location: London or Newcastle, UK (Hybrid - ~1 day per week in office / onsite) Contract: Contract - 6 months with view to extend Day Rate: £550–£600 per day - Outside IR35 About Appvia Appvia is a specialist cloud, platform, and solutions engineering consultancy. We work with organisations to improve software quality, reliability, and delivery outcomes through modern engineering and testing practices. Our teams focus on reducing risk in complex systems by improving automated testing, architectural clarity, and developer feedback loops. About the Role We are seeking a consultative Senior Software Developer in Test with hands-on experience in React and Java to join Appvia as a hands-on testing and quality engineering consultant. This role is centred on modernising automated test strategies for Java/React-based applications, moving away from brittle, heavyweight end-to-end testing towards more effective integration,...