28 java developer jobs found in London

Senior Software Engineer/Outside IR35 Contract/Java/AI/LLM Title: Senior Software Engineer AI First (Java/AI/LLM) Contract: 6 months Outside IR35 Location: London (hybrid) Pay: £500-£600 p/d Digital Transformation. Tiro are looking for senior software developer, to join a 6 month contract with our client an established brand in the financial services sector click apply for full job details

I am currently working with a London-based investment bank who are actively seeking a Senior fullstack Java Developer to work on the development of a business-critical application within the FX space. What you'll need to succeed: Extensive fullstack Java and React experience within financial services - Mandatory. Strong front-office/eTrading application development experience. Good experience with Solace and FIX. Good understanding of FX. What you'll get in return: Up to £600pd outside IR35. Initial 6-month contract with extensions. London-based hybrid working. What you need to do now : If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now. If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career. Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for...

I am currently working with a London-based investment bank who are actively seeking a Senior fullstack Java Developer to work on the development of a business-critical application within the FX space. What you'll need to succeed: Extensive fullstack Java and React experience within financial services - Mandatory. Strong Front Office/eTrading application development experience. Good experience with Solace and FIX. Good understanding of FX. What you'll get in return: Up to £600pd outside IR35. Initial 6-month contract with extensions. London-based hybrid working. What you need to do now : If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now. Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found on our website.

I am currently working with a London-based investment bank who are actively seeking a Senior fullstack Java Developer to work on the development of a business-critical application within the FX space. What you 'll need to succeed: Extensive fullstack Java and React experience within financial services - Mandatory. Strong front-office/eTrading application development experience. Good experience with Solace and FIX. Good understanding of FX. What you 'll get in return: Up to £600pd outside IR35. Initial 6-month contract with extensions. London-based hybrid working. What you need to do now : If you 're interested in this role, click 'apply now ' to forward an up-to-date copy of your CV, or call us now. If this job isn 't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career. Hays Specialist Recruitment Limited acts as an employment agency for...

Role type - Contract role IR35 status - Inside Dat rate - £750 - £900 pd About the Role: A premier Tier 1 investment bank seeks an adept Java developer specialized in algorithmic trading to join their Electronic Trading Technology team. This position involves driving forward new projects and maintaining essential trading engines. Key Responsibilities: • Deliver critical enhancements to trading strategy engines • Development of SOR • Upgrade core framework components • Work closely with quantitative traders to understand and gather requirements • Participate in all phases of the development cycle, including requirement gathering, coding, unit testing, patch reviewing, and providing second-level support Qualifications: Skills: • • Strong command of core Java APIs (Concurrency, collections) • Experience with multithreaded systems, Java garbage collection, and low-latency I/O...

Senior Java Developer - AI first - sought by trading company based in London - Contract (OUTSIDE IR35 - Remote option available for outstanding candidates) What We're Looking For Backend Engineering Expertise 8+ years of software engineering experience with strong Java backend skills. Proven track record in modernising production systems and designing APIs/microservices. Deep understanding of legacy migration strategies and service decomposition. AI/LLM Implementation Skills Hands-on experience with AI development tools (e.g., Claude Code, GitHub Copilot) and Model Context Protocol (MCP). Experience integrating AI into CI/CD pipelines and building AI-powered automation. Knowledge of prompt engineering, model selection, and LLM capabilities. Proven AI Impact Demonstrated success in using AI to improve productivity and code quality. Experience with AI-assisted refactoring, test generation, and documentation at scale. Please apply within for...

Senior Java Developer - AI first - sought by trading company based in London - Contract (OUTSIDE IR35 - Remote option available for outstanding candidates) What We're Looking For Backend Engineering Expertise 8+ years of software engineering experience with strong Java backend skills. Proven track record in modernising production systems and designing APIs/microservices. Deep understanding of legacy migration strategies and service decomposition. AI/LLM Implementation Skills Hands-on experience with AI development tools (e.g., Claude Code, GitHub Copilot) and Model Context Protocol (MCP). Experience integrating AI into CI/CD pipelines and building AI-powered automation. Knowledge of prompt engineering, model selection, and LLM capabilities. Proven AI Impact Demonstrated success in using AI to improve productivity and code quality. Experience with AI-assisted refactoring, test generation, and documentation at scale. Please apply within for further...

Senior Java Developer - AI first - sought by trading company based in London - Contract (OUTSIDE IR35 - Remote option available for outstanding candidates) What We're Looking For Backend Engineering Expertise 8+ years of software engineering experience with strong Java Back End skills. Proven track record in modernising production systems and designing APIs/microservices. Deep understanding of Legacy migration strategies and service decomposition. AI/LLM Implementation Skills Hands-on experience with AI development tools (eg, Claude Code, GitHub Copilot) and Model Context Protocol (MCP). Experience integrating AI into CI/CD pipelines and building AI-powered automation. Knowledge of prompt engineering, model selection, and LLM capabilities. Proven AI Impact Demonstrated success in using AI to improve productivity and code quality. Experience with AI-assisted refactoring, test generation, and documentation at scale. Please apply within for further...

Senior Java Developer - AI first - sought by trading company based in London - Contract (OUTSIDE IR35 - Remote option available for outstanding candidates) What We 're Looking For Backend Engineering Expertise 8 + years of software engineering experience with strong Java backend skills. Proven track record in modernising production systems and designing APIs/microservices. Deep understanding of legacy migration strategies and service decomposition. AI/LLM Implementation Skills Hands-on experience with AI development tools (e.g., Claude Code, GitHub Copilot) and Model Context Protocol (MCP). Experience integrating AI into CI/CD pipelines and building AI-powered automation. Knowledge of prompt engineering, model selection, and LLM capabilities. Proven AI Impact Demonstrated success in using AI to improve productivity and code quality. Experience with AI-assisted refactoring, test generation, and...

This job is with Adaptive Financial Consulting Ltd, an inclusive employer and a member of myGwork – the largest global platform for the LGBTQ+ business community. Please do not contact the recruiter directly. 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, fintech and capital market service providers. With a global reach with offices in London, New York, Barcelona, Manila and Montreal, we have a proven track record of delivering powerful, elegant and intuitive trading technology solutions. We are now looking for Java Developer services on an exciting project! The Services Required A JVM lover who really enjoys...

Senior Software Engineer/ Outside IR35 Contract/ Java/ AI / LLM Title: Senior Software Engineer AI First (Java/ AI/ LLM) Contract: 6 months Outside IR35 Location: London (hybrid) Pay: £500-£600 p/d Digital Transformation.  Tiro are looking for senior software developer, to join a 6 month contract with our client an established brand in the financial services sector. You would be joining a small team pioneering AI in their services. Senior Software Engineer/ AI First, Outside IR35, Contract/ Java/ AI / LLM Responsibilities Develop and maintain software applications using Java. Implement AI solutions to enhance software functionality. Collaborate with cross-functional teams to define, design, and ship new features. Participate in code reviews and maintain code quality. Skills: 6+ years of experience in software development. Strong background in Java programming. Experience in AI technologies (Model Context Protocol, LLM, AI) If you're a...

Senior Java/React Full Stack Developer - £500-£550/day Outside IR35 - Hybrid (London or Newcastle) - 6 Months We're working with a consultancy supporting clients with the modernisation of large, complex software platforms. They're looking for a Senior Java/React Full Stack Developer to join on a contract basis, operating as a hands-on consultant within delivery teams. 6-month contract (view to extend) £500-£550/day Outside IR35 Hybrid : approx. 1 day per week on-site (London or Newcastle) Requirements: Strong React experience with modern Front End practices Strong Java backend development (Spring, MongoDB) Solid understanding of Domain Driven Design (DDD) Experience with microservice architectures Full stack mindset and ability to work across disciplines Comfortable working directly with clients and influencing technical decisions Interest or experience in AI-assisted development is beneficial Tech Stack: Java/Spring React MongoDB...

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 Software Developer in Test Contractor , you'll work...

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 Software Developer in Test | SDET | React | Java | Outside IR35 Modern Test Strategy | Quality Engineering | Public Sector/Consultancy Delivery SR2 is supporting a consultancy partner delivering modern software engineering services across complex Java and React-based systems. This role sits within delivery teams as a hands-on, consultative Senior Software Developer in Test, focused on improving how quality is engineered into software. You'll work closely with developers and platform engineers to modernise testing approaches, reduce brittle end-to-end testing, and introduce smarter, more effective automation strategies, including AI-assisted testing techniques. You'll report into a Principal Software Engineer and act as a testing authority within delivery teams, shaping test strategy rather than just writing tests. The Role You'll take ownership of test architecture and automated testing strategy across Java and React applications, helping teams move away from slow,...

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,...

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 Engineer (Kafka, Spring Boot, Microservices) We’re hiring a Senior Java Engineer to build secure, real-time systems using Java, Spring Boot, and Apache Kafka. You’ll design scalable event-driven microservices, collaborate across the stack, and shape a platform used in mission-critical environments. If you’re a hands-on backend engineer passionate about distributed systems, resilience, security and clean architecture — this is your next challenge. 🌍 Location & Flexibility Work remotely from anywhere in the UK, with the option to use a London office when you prefer in-person time. Team meetups are planned in advance, flexibility is the default. 💡 Required Experience 10+ years’ experience as a Java Backend Engineer / Senior Java Developer Proven track record building and scaling Kafka-based architectures in production Deep expertise with Spring Boot (Security, Web, and Data modules) Experience designing and maintaining event-driven...

CONTRACT SENIOR SOFTWARE ENGINEER - eDV CLEARED NEW CONTRACT JOB OPPORTUNITY AVAILABLE WITHIN A LEADING NATIONAL SECURITY COMPANY FOR A SENIOR SOFTWARE ENGINEER WITH eDV CLEARANCE Contract job opportunity for a Senior Software Engineer Globally leading defence / cyber security company £500 - £750 per day (inside and outside IR35 roles available) London based organisation in an easily accessible location Contract Senior Software Engineer To apply please call or email WHO WE ARE? We are recruiting multiple contract Senior Software Engineers to work with various clients in London ranging from R &D companies, Multi-National Consultancies to SME 's and product based companies. Due to the nature of the work these clients do, you must hold enhanced DV Security Clearance. WHAT WILL THE SENIOR SOFTWARE ENGINEER BE DOING? As a Senior Software Engineer, you will work with an experienced agile team to design and deliver...

Contract Details 6-month contract (extension likely) £550-£600 per day Outside IR35 Hybrid working (London or Newcastle) A specialist cloud and solutions engineering consultancy is seeking a Senior Software Developer in Test to join on a contract basis as a hands-on quality engineering consultant. You will work on modernising automated testing strategies for Java and React applications, helping teams move away from slow, brittle end-to-end testing towards effective integration, functional, and contract testing . The role involves close collaboration with developers and platform engineers, acting as a quality authority within delivery teams and introducing AI-assisted testing approaches to improve coverage and efficiency. Key Requirements Strong experience testing Java and React applications Deep knowledge of automated UI testing Experience designing test strategy and test architecture Hands-on experience with Playwright Knowledge of BDD and...