Average Java Developer salary in London

About The RoleFDM is a global business and technology consultancy seeking a Java / Scala Developer to work for our client within the Investment Banking / Financial Services sector. This is initially a 12-month contract with the potential to extend and will be a hybrid role that will be based in London.Our client is undertaking a large-scale renovation of their Prime Brokerage and Securities Finance Technology estate, building a new consolidated platform for trade capture and post-trade processing across multiple Securities Finance transaction types. This is a high-impact delivery role within a critical programme replacing legacy systems, where the successful candidate will be expected to contribute quickly and operate with minimal hand-holding.Responsibilities: Contribute to the design and build of a new consolidated Trade Capture and Post-Trade Processing platform for Securities Finance transactions (Repo, Securities Lending, Buy/Sell Backs).Develop and enhance backend services using Java and Scala, contributing to both greenfield build and migration from legacy systems.Participate in architecture and system design discussions, including breaking down problems and justifying technical design decisions.Build and maintain mission-critical applications and GUIs used by front-office, trading, and middle-office users.Work collaboratively within an Agile development squad, delivering high-quality, well-tested code in a fast-paced environment.Review and validate AI-assisted development output (e.g. Copilot), acting as a quality gate to ensure correctness and robustness.Support the modelling and migration of Securities Finance transaction data into the new platform.Engage with peers and stakeholders to troubleshoot issues, improve system design, and contribute to delivery best practices.About YouStrong foundation in core Java development; Scala is used extensively within the team, but prior Scala experience is not mandatory if the candidate can demonstrate the ability to pick it up quickly.Solid understanding of algorithms, data structures, and core software engineering principles.Proven architecture and system design capability, including ability to decompose problems and articulate design rationale.Experience building and supporting production systems in a high-pressure delivery environment.Working knowledge of SQL / relational databases.Experience working in Agile environments, including exposure to automated testing and DevOps practices/tools.Comfortable working in an AI-assisted development environment (e.g. GitHub Copilot) and reviewing generated output critically.Strong communication skills and the ability to collaborate effectively within distributed engineering teams.Minimum of 4+ years’ experience in backend software development using Java within an enterprise or regulated environment.About UsFDM is an award-winning global leader in tech and business talent solutions, backed by more than 35 years of industry experience. We have centres across Europe, North America, and Asia-Pacific, and a global workforce of over 2500 employees. FDM has shown exponential growth throughout the years, firmly establishing itself as an award-winning employer, currently listed on the FTSE4Good Index and as a 2026 Financial Times UK ‘Best Employer’. Diversity and InclusionFDM Group is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, colour, religion, sex, sexual orientation, national origin, age, disability, veteran status or any other status protected by federal, provincial or local laws.Why join usCareer coaching, mentoring and access to upskilling throughout your entire FDM careerAssignments with global companies and opportunities to work abroadOpportunity to re-skill and up-skill into new areas, develop non-linear career paths and build a skillset within your fieldAnnual leave and work-place pension

Senior Java Developer (Contract) - Investment Bank - Central LondonContract Length: 6 monthsLocation: Central London (1 day per week onsite) Interview Process: 2 stagesOverviewWe're working with a leading investment bank in Central London seeking a Senior Java Developer to join a front-office aligned team. This role sits within a regulatory/compliance-focused environment, supporting systems with strong exposure to FX options.Key RequirementsDomain Experience:Strong experience with FX OptionsBackground in Regulatory ComplianceFront office exposure preferred (mid/back office acceptable if strong domain alignment)Technical Skills:Java (10+ years core development)Experience with low-latency/high-performance systemsKubernetes / OpenShiftCassandra and OracleHazelcastNice to Have:Frontend experience with React and TypeScriptAdditional InfoCandidates should be comfortable working in a fast-paced banking environmentStrong business understanding is key, particularly around compliance and trading flows

Software EngineerOur new client are expanding their engineering capability and are looking for talented Software Engineers with a strong focus on Java to join a growing team. If you thrive in modern engineering environments and enjoy building scalable, high-quality services, this role will put your skills to work on meaningful, production-grade systems.What You'll Work OnYou'll be developing robust, secure, and efficient services using modern Java frameworks and tooling. Expect to contribute to API development, containerised applications, and cross-functional engineering initiatives.Must-Have SkillsStrong commercial experience with JavaHands-on expertise with RESTful APIsProficiency in Spring BootExperience working with DockerSolid understanding of Java interfaces and object-oriented designMust be eligible for SC ClearanceNice-to-Have SkillsPython exposureExperience with AWSWhat You'll BringA passion for clean, maintainable codeA cooperative mindset and willingness to contribute to team successCuriosity, problem-solving ability, and a drive to continuously improveReasonable Adjustments:Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people of all backgrounds and perspectives. Our success is driven by our people, united by the spirit of partnership to deliver the best resourcing solutions for our clients.If you need any help or adjustments during the recruitment process for any reason, please let us know when you apply or talk to the recruiters directly so we can support you.