11 senior java developer jobs found 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, fintechs and capital market service providers. With a global reach with offices in London, New York, Barcelona, Montreal and Manila, we have a proven track record delivering powerful, elegant and intuitive trading technology solutions. We are expanding our product capability and looking for talented individuals to help build transformational capital markets products including: Aeron - our flagship high-performance messaging infrastructure. Hydra - our developer framework for accelerating the development and delivery of trading systems. Artio - our market-leading...

Senior Java Developer - Outside IR35 - Up to £700 per day Hybrid in Central London October Start Date 12-Month Initial Contract We have partnered with a leader in the financial services sector who is looking for experienced Senior Java Engineers to join their Settlements team . This is a hands-on engineering role focused on developing and enhancing software supporting complex post-trade and settlement workflows . you'll work as part of an experienced engineering team, contributing to both new and existing systems within a fast-moving financial markets environment. The Role Develop and maintain Server Side Java/JVM applications supporting settlement and post-trade processes. Build robust, scalable services using Spring and Spring Boot . Work across greenfield and brownfield development projects. Collaborate with engineers and business stakeholders to understand requirements and deliver effective solutions. Contribute to technical design,...

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, fintechs and capital market service providers. With a global reach with offices in London, New York, Barcelona, Montreal and Manila, we have a proven track record delivering powerful, elegant and intuitive trading technology solutions. We are expanding our product capability and looking for talented individuals to help build transformational capital markets products including: Aeron - our flagship high-performance messaging infrastructure. Hydra - our developer framework for accelerating the development and delivery of trading systems....

Senior Backend Developer (Java/AWS) Rate: £500-£600 per day (Outside IR35) Location: London (3 days per month onsite) Duration: Initial 6-month contract Overview We're supporting a financial services client looking for a Senior Backend Developer to help deliver and optimise a suite of cloud-native services. This is a hands-on engineering role with significant involvement in solution design, technical direction, and code quality. What You'll Be Doing Developing scalable Back End services using Java and Spring Boot Designing and building RESTful APIs and event-driven solutions Deploying and maintaining applications within AWS environments Contributing to architecture, engineering standards, and best practices Supporting CI/CD processes and Infrastructure as Code initiatives Participating in code reviews and mentoring other developers Key Skills & Experience Strong commercial experience with Java (ideally Java 21+) and Spring Boot Proven background building...

Senior Backend Developer (Java / AWS) Rate: £500- £600 per day (Outside IR35) Location: London (3 days per month onsite) Duration: Initial 6-month contract Overview We 're supporting a financial services client looking for a Senior Backend Developer to help deliver and optimise a suite of cloud-native services. This is a hands-on engineering role with significant involvement in solution design, technical direction, and code quality. What You 'll Be Doing Developing scalable backend services using Java and Spring Boot Designing and building RESTful APIs and event-driven solutions Deploying and maintaining applications within AWS environments Contributing to architecture, engineering standards, and best practices Supporting CI/CD processes and Infrastructure as Code initiatives Participating in code reviews and mentoring other developers Key Skills & Experience Strong commercial experience with Java (ideally Java...

Senior Backend Developer (Java/Spring Boot/AWS) Rate: £500 - £600 Outside IR35 Location: London - 3 times on site a month Duration: 6 months initial The role: I'm working with a financial services organisation that needs a Senior Backend Developer to build and maintain cloud-based services on AWS. The work is hands-on and includes code reviews and input into technical decisions. Responsibilities: Build REST and event-driven microservices in Java and Spring Boot Deploy and support services on AWS (eg ECS/EKS, Lambda, RDS, DynamoDB, SQS/SNS) Own services from design through to production support Maintain CI/CD pipelines and infrastructure as code (Terraform, CloudFormation or CDK) Review code and contribute to architecture decisions Essential skills: Commercial experience with Java 21 and Spring Boot Building and running applications on AWS Microservices and API design Reasonable Adjustments: Respect and equality are core values to us. We are...

Senior Backend Developer (Java / Spring Boot / AWS) Rate: £500 - £600 Outside IR35 Location: London - 3 times on site a month Duration: 6 months initial The role: I 'm working with a financial services organisation that needs a Senior Backend Developer to build and maintain cloud-based services on AWS. The work is hands-on and includes code reviews and input into technical decisions. Responsibilities: Build REST and event-driven microservices in Java and Spring Boot Deploy and support services on AWS (e.g. ECS/EKS, Lambda, RDS, DynamoDB, SQS/SNS) Own services from design through to production support Maintain CI/CD pipelines and infrastructure as code (Terraform, CloudFormation or CDK) Review code and contribute to architecture decisions Essential skills: Commercial experience with Java 21 and Spring Boot Building and running applications on AWS Microservices and API design...

About the job Senior Java Developer London Contract £650 - £750 per day outside IR35 Hybrid - 2/3 days onsite in the City We're partnering with a specialist consultancy to build a greenfield asset tokenisation platform for a major global financial institution. This is a hands-on Java engineering role focused on building the platform from scratch, solving complex technical challenges and shaping the future of the firm's digital assets capability. You'll be joining at the start of the journey, with the opportunity to influence both the platform and the wider programme as it grows. What you'll be doing Build a greenfield asset tokenisation platform using Java. Develop new services and platform components in a Linux environment. Work closely with other engineers to shape the design and direction of the platform. Solve complex engineering problems in a fast-moving environment. Use modern AI coding tools such as Claude Code, Windsurf or Devin as part of...

Principal/Lead Developer - AI-Assisted Engineering - Java/React - London Market Insurance - Contract to Permrequirement for an immediate start. The Principal/Lead Developer - AI-Assisted Engineering - Java/React - London Market Insurance - Contract to Perm will be working for a leading specialty insurance broking group, Embedded as the senior technical lead within one of several product squads. You'll work alongside a Development Manager, Product Owner and development team, owning technical direction with genuine autonomy and influence. Principal/Lead Developer - AI-Assisted Engineering - Java/React - London Market Insurance - Contract to Perm Key Skills: A career software developer, with a distinguished-engineer mindset: you own outcomes, not tickets London Market experience is essential, ideally gained within a broker (eg building or supporting a broker workbench or placement platform). Insurer, MGA, carrier or InsurTech backgrounds will also be considered Strong...

Job Information Date Opened 14/10/2026 Job Type Contract Industry Government & Public Sector Work Experience 5+ years Salary 275-325 Outside IR35 City London Province Greater London Country United Kingdom Postal Code EC1A Job Description About Scrumconnect Consulting Scrumconnect Consulting is a UK-based, award-winning digital consultancy delivering high-quality digital products and services for major public sector clients, including DWP, MoJ, NHS and HMRC. With a team of over 300 consultants, we specialise in building secure, user-centred and scalable digital solutions that serve millions of citizens. We foster a collaborative engineering culture, encourage continuous learning and prioritise inclusivity. As a Disability Confident Level 1 employer, we are committed to making our recruitment processes and working environments accessible and supportive for everyone. Role Overview We are looking for a highly skilled QA Automation...

Job Information Date Opened 14/10/2026 Job Type Contract Industry Government & Public Sector Work Experience 5+ years Salary 275-325 Outside IR35 City London Province Greater London Country United Kingdom Postal Code EC1A Job Description About Scrumconnect Consulting Scrumconnect Consulting is a UK-based, award-winning digital consultancy delivering high-quality digital products and services for major public sector clients, including DWP, MoJ, NHS and HMRC. With a team of over 300 consultants, we specialise in building secure, user-centred and scalable digital solutions that serve millions of citizens. We foster a collaborative engineering culture, encourage continuous learning and prioritise inclusivity. As a Disability Confident Level 1 employer, we are committed to making our recruitment processes and working environments accessible and supportive...