senior java backend developer jobs in London

Solirius Ltd. is seeking a Senior Java Engineer to join our engineering team in the UK. You will design, develop and maintain scalable Java applications with a focus on cloud-native microservices and modern software practices. AI-enabled capabilities are highly desirable as we explore advanced solutions.You will collaborate with cross-functional teams,...

At The Multiplayer Group (MPG), we create world-class multiplayer experiences through Co-Dev and Full-Dev partnerships. Our people-first culture supports a diverse, global team in a welcoming and flexible work environment. With teams spread worldwide, we prioritise connection—both online and in person. Giving back is central to who we are, with a focus on...

About ARQARQ is one of the fastest-growing fintechs in the world. Our mission is to redefine how people interact with money across borders, building the infrastructure to move value seamlessly. We’re still early in our journey, which means every person who joins shapes the future of our product, culture, and growth. If you’re excited by big challenges,...

Backend Development: Set up and maintain the backend server using Flask to support the application, ensuring scalability, security, and efficiencySeniority levelEntry levelEmployment typeFull-timeJob functionEngineering and Information TechnologyIndustriesTechnology, Information and InternetLocation: London, England, United KingdomWe’re unlocking community...

Opus Recruitment Solutions Limited in London is seeking a Senior Product Engineer to join a growing AI-powered insurance startup. You will be responsible for backend development using TypeScript and Node across the full software lifecycle, with two in-office days per week in Central London.The role offers a chance to make a real impact as the product expands...

Our client is hiring a Senior Quant Developer to join the Pricing team of a leading global institutional liquidity provider operating across digital assets and traditional financial markets.This is a hands‑on role at the intersection of quantitative research and production engineering. You’ll help design and implement sophisticated pricing, hedging and...

Are you a passionate Flutter Developer looking to make a meaningful impact in the tech world? Our client, an innovative and fast-growing start-up, is seeking a highly skilled developer to join their dynamic team. Based in [Location], this is a unique opportunity to work on cutting-edge projects and grow alongside a company that’s redefining its industry.If...

Senior AI Engineer Location: Remote (UK) or Hybrid - London (1 days per week in the office if London-based) Salary: £65,000 - £75,000 + Excellent Benefits Job Type: Permanent Please note: Applicants must have the right to work in the UK. Unfortunately, visa sponsorship is not available for this position. The Opportunity We're looking for a Senior AI...

About The Company Emma is the app to manage all things money. Our mission is to empower millions of people to live a better and more fulfilling financial life. Emma was founded by engineers, who are extremely focused on coding, product and data. These are the three pillars on which we want to build a strong tech culture and fix personal finance once for...

OverviewWe are seeking a highly skilled and experienced individual to join our dynamic team at Demo Co. In this position, you will play a critical role in designing, developing, and maintaining innovative software solutions that meet the needs of our clients.Key ResponsibilitiesCollaborate with cross-functional teams to define, design, and ship new...

**Join our expanding engineering team!** We're hiring a permanent Senior Backend Engineer to join our Asset Sales group as we scale one of the most important parts of M-KOPA's FinTech platform. Build distributed, event-driven microservices and help shape what AI-native engineering looks like at M-KOPA. **The Impact 💚** Your code will directly power...

Meltwater Group is seeking a backend-focused software engineer to design and build scalable API and export features in a cloud-native environment. You will contribute to high-throughput data pipelines and MCP server architecture, working with AWS, Golang, and modern observability practices.The role emphasizes collaboration with product managers and senior...

Senior Full Stack Developer Location: London Contract: Contract Working Pattern: Office-based We’re looking for an experienced Senior Full Stack Developer to join a small development team building and maintaining a complex, business-critical internal platform. This is a hands-on senior role with genuine technical ownership. You’ll take requirements...

Our Global Structurethe company is now part of DoorDash, bringing together teams with even greater reach, scale, and ambition. Depending on your role, you may collaborate with teammates, systems, and leaders across DoorDash and Wolt. Together, we're unlocking new possibilities as one global team.Your job is to make sure every payout and transaction lands...

About Us: Solirius Reply, part of the Reply Group, is a technology consultancy and digital transformation partner that helps organisations solve complex challenges through strategy, design, engineering, and delivery. We work closely with our clients to deliver secure, accessible, user-focused services that evolve with their needs. By combining deep technical...

Do you enjoy designing and developing scalable, high-performance applications using Java and JavaScript? Do you enjoy designing and developing scalable, high-performance applications using Java and JavaScript? About The Team You will join the Identity & Access Management team, which owns the authentication and authorisation infrastructure underpinning...

Senior/Lead Backend Game Developer - Remote in EuropeJob Openings Senior/Lead Backend Game Developer - Remote in EuropeAbout the job Senior/Lead Backend Game Developer - Remote in EuropeJob Responsibilities:Design and implement scalable game backend services that can handle high traffic and real-time multiplayer interactions.Write robust and efficient code...

Reference: BBBH3852_1784710217Senior Software DeveloperSalary: Up to 80,000 + Benefits + BonusLocation: Newcastle, London, Leeds, Manchester, Blackpool or SheffieldWorking Hours: 40 hours per weekA globally recognised organisation is looking for an experienced Senior Software Developer to help design, develop and deliver secure, scalable digital solutions...

Our client is a leading IT services and digital transformation consultancy. Company DescriptionOur client has celebrated 30 years in business and continues to be trusted by global brands to deliver technology and transformation solutions that drive customer success. Our deep expertise enables our customers to navigate the rapidly evolving technology...

About ExTracExTrac is a decision intelligence company used by governments, defence organisations, financial institutions, and corporates operating in complex, fast-moving environments. Our capabilities fuse curated data sources, domain-specific AI, and deep human expertise to transform information overload into clear, actionable foresight.Our ambition is to...