16 java developer jobs found in London

We have an exciting opportunity for experienced Java developers to join our team! You will have a passion for software development and an excellent understanding of how to define and deliver solutions iteratively and collaboratively. You will be involved in all areas of delivery, with the technical gravitas to mentor and inspire the development team; playing an integral part in helping them continuously improve by sharing your own knowledge, experience and insights. You will be confident in challenging business requirements to ensure you are continuously delivering the best possible outcome, harnessing innovation and driving the adoption of new technologies to deliver business value. Your vision and ambition will contribute to shaping our online technology roadmap, influencing our future technical direction and balancing passion with precision to deliver exceptional online service and solutions for our customers.   This is an initial 12 month contract that sits...

Java Developer / Software Engineer - Design & Build Fintech Product / Banking - Spring Boot, Claude/Codex also essential. *YOU MUST HAVE BEEN INVOLVED IN DESIGN, ARCHITECTURE AND BUILD OF ANY FINTECH PRODUCT* for e.g. Current Account OR SAVINGS OR ISA's OR Fixed Term Deposits, Lending, Mortgages 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...

JAVA DEVELOPER – LONDON – CONTRACT OUTSIDE IR35  – FINTECH In London 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 a Java Developer to provide services on an exciting project!  The service provision will require:  Solid JVM skills with strong design patterns. Ability to solve complex...

Senior / Lead Software Engineer (Java) - o/s IR35 - Hybrid (2 dpw in office) A large retailer urgently seeks an experienced Senior Software Development Engineer to take a lead role in the design, development and support of scalable, cloud-native Java applications Working in an Agile, DevOps environment, you'll build microservices, APIs and event-driven solutions while collaborating with engineers, data scientists and operations teams to deliver high-quality software. The role is outside IR35 and requires 2 days per week in the office. Responsibilities include: Design and develop scalable Java applications and microservices Build and maintain cloud-native solutions using Azure Improve system performance, reliability and scalability Develop APIs and event-driven services with Kafka Mentor engineers and promote engineering best practices Support software throughout its full lifecycle in a CI/CD environment Essential Experience Experience of designing and...

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 a Java Developer to provide services on an exciting project! The service provision will require: Solid JVM skills with strong design patterns. Ability to solve complex technical challenges, especially in cloud-based environments and by using event driven architecture patterns. Experience of the...

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 a Java Developer to provide services on an exciting project! The service provision will require: Solid JVM skills with strong design patterns. Ability to solve complex technical challenges, especially in cloud-based environments and by using event driven architecture patterns. Experience of...

Senior/Lead Software Engineer (Java) - o/s IR35 - Hybrid (2 dpw in office) A large retailer urgently seeks an experienced Senior Software Development Engineer to take a lead role in the design, development and support of scalable, cloud-native Java applications Working in an Agile, DevOps environment, you'll build microservices, APIs and event-driven solutions while collaborating with engineers, data scientists and operations teams to deliver high-quality software. The role is outside IR35 and requires 2 days per week in the office. Responsibilities include: Design and develop scalable Java applications and microservices Build and maintain cloud-native solutions using Azure Improve system performance, reliability and scalability Develop APIs and event-driven services with Kafka Mentor engineers and promote engineering best practices Support software throughout its full lifecycle in a CI/CD environment Essential Experience Experience of designing and...

We are now seeking a Technical BA with strong experience in JSON schema and an IT background. Some knowledge of insurance is beneficial but not essential. This role is for a Technical Business Analyst experienced in JSON schemas and APIs, with a solid IT background. Working outside IR35, the BA will focus on technical requirements, particularly JSON schema development and API integration, supporting various financial and insurance services projects. Some insurance knowledge is helpful, though not required, as the primary focus is technical proficiency in JSON and APIs. Key Responsibilities Develop and document JSON schemas. Collaborate with technical and business teams for API integrations. Provide technical insights and recommendations. Ensure alignment with IT and business needs in schema and API solutions. Required Skills/Experience Proven experience with JSON schema development and API integration. IT background with strong technical analysis...

Software Engineer/AI Engineer Fintech & Payments Domain. £600-£650/day LTD CO OUTSIDE IR35 PAY 1-2 days onsite London. Our Fintech Financial Service/Banking & Payment Service Client based in Central London seeks a proactive, hands-on Senior Software Engineer & AI Engineer with Claude or Codex & Java Development skills, with a particular importance to solid expertise in Claude or Codex AI Tooling, Agentic AI, Java Development using Spring Boot within a Fintech Payment Domain setting. YOU WILL NOT BE CONSIDERED IF YOU DO NOT HAVE FINTECH & PAYMENTS & JAVA & STRONG AI! The ideal candidate MUST HAVE previous experience working in a startup/scaleup Fintech Financial Services environment. Any ISA product implementation/integration experience is an advantage but not essential. AI skills in Codex, Claude is highly sought as my client is looking for someone who is an AI Enthusiast. Our client is hiring a hands-on Software Engineer/Java Developer to support...

KDB Developer - Outside IR35 Contract London, UK - Hybrid Working Up to £800 per day Long-Term Engagement on a Rolling Contract May Start Date Our client, a leader in the FinTech space are searching for a KDB Developer to add to their Client Engineering team! You'll be working alongside Software teams to develop, test and maintain all code for client applications. Responsibilities will include : Gather and translate business requirements into technical solutions for market data and analytics applications Design, develop, test and maintain kdb+ applications and supporting services Support full project delivery lifecycle, including debugging, optimisation and production support Perform data analysis and build reporting/analytics outputs for stakeholders Mentor junior developers and contribute to code quality, standards and team delivery Technical Skills needed : Hands-on experience with kdb+ and strong proficiency in q for time-series data...

Senior Mobile Automation Engineer (SC Cleared) £450 per day | Outside IR35 | Remote First | Occasional London Travel We're seeking an experienced Senior Mobile Automation Engineer to join a large-scale digital programme, helping shape and deliver modern mobile testing practices across multiple product teams. Working closely with senior engineering and quality stakeholders, you'll play a key role in driving testing excellence, defining automation strategy, and ensuring high-quality mobile experiences across both iOS and Android platforms. Key Responsibilities Define and implement mobile automation testing strategies. Build, maintain and improve scalable automation frameworks. Drive quality engineering best practice across multiple teams. Deliver automated end-to-end, integration, regression and API testing. Collaborate with developers, architects, analysts and product stakeholders. Support and mentor other testers within the team. Champion continuous improvement across...

DevOps Engineer - Contract – Consulting - AWS, Kubernetes, Terraform, Python / Go Oliver Bernard are currently working with a Consultancy client of ours who are looking for strong DevOps Contractors, from a Development background, for a large Cloud, Container and Software focused project. You’ll be expected to work in cross-functional teams, devised of DevOps Engineer, Architects and Developers, on a project to help scale the DevOps and Engineering practices for a key client of theirs. To be considered for this position you must have experience with the following: Strong experience with AWS and AWS Services Containerisation / Orchestration with Docker and Kubernetes History of IaC with Terraform, alongside CI/CD and Automation work Background in Software Engineering, comfortable coding with an OO language (ideally Python, Go or Java) Previous experience working in Finance or Regulated environments This position can offer £550-650 p/day, outside IR35,...

DevOps Engineer | Outside IR35 | Remote We are looking for a DevOps Engineer to support a technology project, working across the maintenance, monitoring and improvement of live cloud services. The Role You will support AWS-hosted applications and services, proactively monitoring production environments and investigating technical issues. The role requires a mixture of cloud, application and operational experience, alongside the ability to work directly with client stakeholders. Key Responsibilities Monitor live services and respond proactively to emerging issues. Investigate and resolve application bugs, incidents and performance problems. Support applications and infrastructure hosted within AWS. Troubleshoot services developed using Java, .NET, Node.js or Python. Work directly with client stakeholders during investigations. Contribute to service improvements and operational resilience. Essential Strong AWS experience, including EC2, ECS, RDS, DocumentDB and...

Full Stack Engineer (LLM/AI) £450 per day | Outside IR35 | 3-6 Month Contract | Hybrid (London) - 2 days onsite | ASAP Start Our trusted EdTech partner, supporting over 600 million users across 100 countries, is looking for an experienced Full Stack Engineer to help deliver the next generation of AI-powered language learning and assessment products. You'll be a hands-on engineer with strong Python, React, JavaScript/TypeScript and AWS experience, developing scalable cloud-native applications and integrating AI capabilities into production systems. Recent experience developing Chat or Messaging applications within the Education or Learning sector is essential. Key Responsibilities: Develop and maintain scalable full-stack applications using Python, React and AWS. Contribute to technical architecture, solution design and engineering best practice. Build high-quality, secure and performant software through short delivery iterations. Collaborate with Product, Design, QA...

Full Stack Engineer (LLM/AI) £450 per day | Outside IR35 | 3-6 Month Contract | Hybrid (London) - 2 days onsite | ASAP Start Our trusted EdTech partner, supporting over 600 million users across 100 countries, is looking for an experienced Full Stack Engineer to help deliver the next generation of AI-powered language learning and assessment products. You 'll be a hands-on engineer with strong Python, React, JavaScript/TypeScript and AWS experience, developing scalable cloud-native applications and integrating AI capabilities into production systems. Recent experience developing Chat or Messaging applications within the Education or Learning sector is essential. Key Responsibilities: Develop and maintain scalable full-stack applications using Python, React and AWS. Contribute to technical architecture, solution design and engineering best practice. Build high-quality, secure and performant software through short delivery iterations. Collaborate...

Test Analyst – Outside IR35 Contract (must prior experience in testing). Will need to be immediately available. We're looking for a Junior Test Analyst to join a leading financial organisation on an Outside IR35 contract. Based in London (2 days per week onsite) , you'll support system, integration and automation testing across Browser, Java, PowerBuilder, Appian and OpenText applications. You'll create test plans and cases, execute tests, log defects, support UAT, and work closely with developers and business stakeholders. Experience with software testing, strong analytical skills and excellent communication are essential. Financial services experience is advantageous but not essential.