Average Java Script 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

Java Engineer• Salary to £45k + Company Options Scheme• Hybrid working between your home, their offices (London Vauxhall) & client sites. NB: Please only apply if you are a UK National and able to achieve SC (ideally DV) clearance i.e. you have at least 5 years residency in the UK with no more than a 3 month break outside the UK.This company is a Workflow & AI Orchestration Specialist. They're on a mission to modernise how public sector organisations manage casework, derive insight from data and deliver citizen services. They’re growing fast and looking for bright, dynamic people to help build their business.Role They’re looking for a Java Engineer to join their implementation team. You’ll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration — helping their public-sector clients build secure, scalable, and resilient digital services.You’ll collaborate with solution architects, business analysts, and designers to translate workflows into elegant, maintainable code. You’ll play a key part in defining technical standards, optimising runtime performance, and mentoring less- experienced engineers in workflow-centric delivery.This is an ideal role for someone who enjoys solving complex process problems through clean code, automation, and modern engineering practices.The role involves visiting client sites; the company will cover travel expenses. Frequency is uncertain but candidates should be comfortable with that being 2-3 days per week. Client sites could be anywhere but will most likely be in & around London.ResponsibilitiesDesign, develop, and deploy Camunda-based process and decision automation solutionsImplement and integrate Java-based microservices, APIs, and connectors within orchestration flowsTranslate BPMN and DMN models into executable workflows and reusable componentsCollaborate closely with analysts and service designers to refine and iterate business processesDevelop and maintain automated test suites, CI/CD pipelines, and containerised deploymentsOptimise Camunda engine performance and monitor workflow metrics for production environmentsParticipate in code reviews, peer testing, and technical design discussionsContribute to their internal best-practice frameworks and automation acceleratorsEssential Eligible (have resided in the UK for the past 5 years) and prepared to go through UK SC Security ClearanceExperience in Java software engineering and object-oriented designSpring (Boot) experienceExperience with REST APIs, and microservice architecturesKnowledge of Docker and Kubernetes for containerisation and orchestrationProficiency in Git, CI/CD pipelines, and automated testing frameworksUnderstanding of event-driven design and message brokers (e.g. Kafka, RabbitMQ)Good knowledge of security, authentication, and integration patterns for enterprise systemsExperience working in agile teams within digital transformation or automation programmesA willingness to learn BPMN and Camunda toolingSome exposure to process automation or microservice orchestrationDesirable Experience with Camunda 8 (Zeebe) clusters and Operate/Tasklist componentsExperience implementing solutions using Camunda 7 or 8 (BPMN/DMN)Familiarity with Camunda connectors, external task workers, and scripting extensionsExposure to cloud platforms (AWS, Azure, GCP) and infrastructure-as-code (Terraform, Helm)Experience integrating process automation with case-management or service-orchestration platformsUnderstanding of agentic AI capabilities and how they can complement workflow automationExperience mentoring developers or contributing to open-source Camunda extensionsAlready holding UK security clearance (SC, DV, eDV)Other StuffNB: Please only apply if you are a UK National and able to achieve SC or DV clearance. i.e. you have at least 5 years residency in the UK with no more than a 3 month break outside the UK.NB: for non-UK Citizens; we cannot accept applications from anyone requiring sponsorship (now or in the future) for UK permanent employment status. If you are utilising a work visa this must allow you to work in the UK unrestricted for at least the next 5 years. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid junior jnr

Java Engineer• Salary to £45k + Company Options Scheme• Hybrid working between your home, their offices (London Vauxhall) & client sites. NB: Please only apply if you are a UK National and able to achieve SC (ideally DV) clearance i.e. you have at least 5 years residency in the UK with no more than a 3 month break outside the UK.This company is a Workflow & AI Orchestration Specialist. They're on a mission to modernise how public sector organisations manage casework, derive insight from data and deliver citizen services. They’re growing fast and looking for bright, dynamic people to help build their business.Role They’re looking for a Java Engineer to join their implementation team. You’ll work across Camunda BPMN/DMN process automation, API integration, and microservice orchestration — helping their public-sector clients build secure, scalable, and resilient digital services.You’ll collaborate with solution architects, business analysts, and designers to translate workflows into elegant, maintainable code. You’ll play a key part in defining technical standards, optimising runtime performance, and mentoring less- experienced engineers in workflow-centric delivery.This is an ideal role for someone who enjoys solving complex process problems through clean code, automation, and modern engineering practices.The role involves visiting client sites; the company will cover travel expenses. Frequency is uncertain but candidates should be comfortable with that being 2-3 days per week. Client sites could be anywhere but will most likely be in & around London.ResponsibilitiesDesign, develop, and deploy Camunda-based process and decision automation solutionsImplement and integrate Java-based microservices, APIs, and connectors within orchestration flowsTranslate BPMN and DMN models into executable workflows and reusable componentsCollaborate closely with analysts and service designers to refine and iterate business processesDevelop and maintain automated test suites, CI/CD pipelines, and containerised deploymentsOptimise Camunda engine performance and monitor workflow metrics for production environmentsParticipate in code reviews, peer testing, and technical design discussionsContribute to their internal best-practice frameworks and automation acceleratorsEssential Eligible (have resided in the UK for the past 5 years) and prepared to go through UK SC Security ClearanceExperience in Java software engineering and object-oriented designSpring (Boot) experienceExperience with REST APIs, and microservice architecturesKnowledge of Docker and Kubernetes for containerisation and orchestrationProficiency in Git, CI/CD pipelines, and automated testing frameworksUnderstanding of event-driven design and message brokers (e.g. Kafka, RabbitMQ)Good knowledge of security, authentication, and integration patterns for enterprise systemsExperience working in agile teams within digital transformation or automation programmesA willingness to learn BPMN and Camunda toolingSome exposure to process automation or microservice orchestrationDesirable Experience with Camunda 8 (Zeebe) clusters and Operate/Tasklist componentsExperience implementing solutions using Camunda 7 or 8 (BPMN/DMN)Familiarity with Camunda connectors, external task workers, and scripting extensionsExposure to cloud platforms (AWS, Azure, GCP) and infrastructure-as-code (Terraform, Helm)Experience integrating process automation with case-management or service-orchestration platformsUnderstanding of agentic AI capabilities and how they can complement workflow automationExperience mentoring developers or contributing to open-source Camunda extensionsAlready holding UK security clearance (SC, DV, eDV)Other StuffNB: Please only apply if you are a UK National and able to achieve SC or DV clearance. i.e. you have at least 5 years residency in the UK with no more than a 3 month break outside the UK.NB: for non-UK Citizens; we cannot accept applications from anyone requiring sponsorship (now or in the future) for UK permanent employment status. If you are utilising a work visa this must allow you to work in the UK unrestricted for at least the next 5 years. Profile 29 recruitment keywords: Java software engineer object-oriented design OOD Camunda BPMN DMN Spring Boot REST API microservice architecture Docker Kubernetes containerisation orchestration Git CI/CD pipelines automated testing frameworks Kafka RabbitMQ Security authentication integration patterns enterprise systems agile digital transformation automation Java developer Camunda developer Zeebe Cloud AWS Azure GCP Terraform Helm process automation agentic AI artificial intelligence security clearance SC DV eDV London home based hybrid junior jnr