26 to 43 of 43 Senior Backend Developer Jobs in London

overall system. A prototype of the demo is already available internally. Responsibilities: Building on an existing prototype, the candidate will work directly with the research team to refine the backend of the current Flask-based solution to enable reliable and scalable front-end/back-end communication and model interaction. The candidate will build on the APIs available for … the model controlling the character and the simulator to develop the back-end component. The candidate will be responsible for the deployment of the backend on internal servers. Requirements: Experience in developing web-based applications including back-end development and deployment. Experience in deploying ML models on cloud services (e.g., AWS). #J-18808-Ljbffr More ❯

Senior Backend Developer (Platform team) Europe About Smartcat Smartcat is building the future of work, where human expertise meets digital teammates to drive 10x to 1000x productivity gains for the world’s leading enterprises. We’re on the frontier of an entirely new category: Agentic AI. We enable enterprises to build high-performing hybrid workforces made up … shape the future of work with us. Join us in unlocking global potential, one human and agent team at a time. Why you should join our team As a Senior Software Engineer on our Product Platform Team (which is focused on our Product’s API Gateway), you will play a pivotal role in rebuilding our product’s core architecture More ❯

mobile apps and advanced integrations with major tech brands including Instagram , Facebook and Google. Role Overview Given our exciting and progressive growth plans, we are looking for an exceptional Senior Back-End Engineer to come join our global business. Working collaboratively in a cross-functional product team within a tribe , you will beaccountable for designing and developing applications and … architecture - Knowledge of event-driven systems and tools/protocols like Kafka, and gRPC will be a plus. Experience - Have experience (~3+ years) working on internal product engineering teams, developer tools, developer productivity or infrastructure products at scale. Adaptable - Are a generalist engineer with an ability to pick up new frameworks quickly and willing to work across the More ❯

Social network you want to login/join with: Mid-Senior Backend Developer (Node.js), london col-narrow-left Client: Oliver Bernard Location: london, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 4 Posted: 31.05.2025 Expiry Date: 15.07.2025 col-wide Job Description: Mid-Senior Backend Developer (Node.js … your growth Key requirements: Experience with Node.js Familiarity with message brokers like SNS, Kafka, or similar. AWS. Interest working with data would be a bonus. If you’re a Backend Developer who has a real interest in software and technology, please apply. #J-18808-Ljbffr More ❯

Social network you want to login/join with: Mid-Senior Backend Developer (Node.js), london (city of london) col-narrow-left Client: Oliver Bernard Location: london (city of london), United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 3 Posted: 16.06.2025 Expiry Date: 31.07.2025 col-wide Job Description: Mid-Senior Backend Developer (Node.js) 2 days p/week in London £45-70k depending on experience Would you like the opportunity to join a rapidly growing organisation who have doubled in size every 12 months for the past few years. They’re currently looking for a Software Engineer who has experience working with a loosely service based … your growth Key requirements: Experience with Node.js Familiarity with message brokers like SNS, Kafka, or similar. AWS. Interest working with data would be a bonus. If you’re a Backend Developer who has a real interest in software and technology, please apply. #J-18808-Ljbffr More ❯

Social network you want to login/join with: Senior SAP Commerce Backend Developer (f/m/d), London Client: Envoy Location: London, United Kingdom Job Category: Other EU work permit required: Yes Job Reference: b182405a8fd4 Job Views: 8 Posted: 22.06.2025 Expiry Date: 06.08.2025 Job Description: Want to join us on our journey? You'll be More ❯

adopting common interface patterns is better for UX than reinventing the wheel. Job Requirements Interactively plagiarize covalent “outside the box” thinking vis-a-vis. Holistically communicate integrated channels via backend interfaces. Globally actualize effective processes through synergistic ROI. Skill & Experience You have at least 3 years of experience working as a Product Designer. You have experience using Sketch and More ❯

Senior Java Engineer Kafka & Spring Boot We re working with an innovative team building the next generation of secure, real-time communication and data platforms. Their flagship product is a fresh reimagining of an existing system, crafted to provide robust, distributed coordination for a wide range of uses from emergency response and humanitarian logistics to private collaboration and secure … you d like a change of scene, but in-person attendance is only occasionally required for team meetups or workshops always with advance notice. We re looking for a Senior Java Engineer who thrives in the world of Kafka and Spring Boot. You ll team up with infrastructure, AI, and frontend specialists to create reliable backend services that … keep people and teams connected when it matters most. Architect and build event-driven microservices using Java, Spring Boot, and Kafka Be responsible for the backend engineering for secure, distributed real-time systems Design and deliver rock-solid APIs in collaboration with frontend and AI colleagues Pitch in on architecture decisions and mentor your peers to keep code quality More ❯

x6 PHP Software Engineers/Backend Developers – PHP/Symfony/Restful API - Fintech start-up based in the UK 🌳🌳🌳 Areti has exclusively partnered with a Fintech start-up urgently seeking x6 PHP Software Engineers/Backend Developers for a Fintech start-up based in the UK. (FULLY REMOTE) My client has just received funding and looking to … in one of the most talented software engineering teams around and will offer the chance to move into a tech lead position very quickly. If you are a talented developer looking for a company that offers fully remote working, then please send your cv to me today. I have interview slots already pre-booked so suitable candidates will be More ❯

x6 PHP Software Engineers/Backend Developers – PHP/Symfony/Restful API - Fintech start-up based in the UK 🌳🌳🌳 Areti has exclusively partnered with a Fintech start-up urgently seeking x6 PHP Software Engineers/Backend Developers for a Fintech start-up based in the UK. (FULLY REMOTE) My client has just received funding and looking to … in one of the most talented software engineering teams around and will offer the chance to move into a tech lead position very quickly. If you are a talented developer looking for a company that offers fully remote working, then please send your cv to me today. I have interview slots already pre-booked so suitable candidates will be More ❯

x6 PHP Software Engineers/Backend Developers – PHP/Symfony/Restful API - Fintech start-up based in the UK Areti has exclusively partnered with a Fintech start-up urgently seeking x6 PHP Software Engineers/Backend Developers for a Fintech start-up based in the UK. (FULLY REMOTE) My client has just received funding and looking to … in one of the most talented software engineering teams around and will offer the chance to move into a tech lead position very quickly. If you are a talented developer looking for a company that offers fully remote working, then please send your cv to me today. I have interview slots already pre-booked so suitable candidates will be More ❯

Social network you want to login/join with: Senior Backend Developer, south west london Client: Amicus Location: south west london, United Kingdom Job Category: Other EU work permit required: Yes Job Views: 3 Posted: 04.06.2025 Expiry Date: 19.07.2025 Job Description: I am currently working with one of the UK’s fastest growing fintech companies, recently acquired … multiple industry awards, and a mission to make investing accessible and commission-free, this company is reshaping how everyday people build their financial futures. They’re looking for a Senior Backend Engineer to join their team. While the current stack is primarily TypeScript and Node.js, they’re open to candidates with a strong experience in any backend technology who are willing to transition and learn their ecosystem. The role The company has both web and mobile platforms, and as a Senior Backend Engineer, you'll work on the backend to support these growing platforms. You'll focus on building infrastructure, developing automation tools, and improving the overall system performance and reliability as the More ❯

industry awards, and a mission to make investing accessible and commission-free, they’re genuinely reshaping how everyday people build their financial futures. They’re now looking for both Senior and Staff Backend Engineers to join the team. The stack is primarily TypeScript and Node.js , but they’re open to strong backend engineers from any background who … ecosystem. You’ll be working on: Scalable infrastructure to power both web and mobile platforms Automation tools and performance improvements Reliability and systems engineering Salary: Up to £107K for Senior Up to £120K for Staff Benefits: 25 days holiday + bank holidays + your birthday off Enhanced pension scheme Private health insurance Dedicated learning & development budget Cycle to Work More ❯

industry awards, and a mission to make investing accessible and commission-free, they’re genuinely reshaping how everyday people build their financial futures. They’re now looking for both Senior and Staff Backend Engineers to join the team. The stack is primarily TypeScript and Node.js , but they’re open to strong backend engineers from any background who … ecosystem. You’ll be working on: Scalable infrastructure to power both web and mobile platforms Automation tools and performance improvements Reliability and systems engineering Salary: Up to £107K for Senior Up to £120K for Staff Benefits: 25 days holiday + bank holidays + your birthday off Enhanced pension scheme Private health insurance Dedicated learning & development budget Cycle to Work More ❯

industry awards, and a mission to make investing accessible and commission-free, they’re genuinely reshaping how everyday people build their financial futures. They’re now looking for both Senior and Staff Backend Engineers to join the team. The stack is primarily TypeScript and Node.js , but they’re open to strong backend engineers from any background who … ecosystem. You’ll be working on: Scalable infrastructure to power both web and mobile platforms Automation tools and performance improvements Reliability and systems engineering Salary: Up to £107K for Senior Up to £120K for Staff Benefits: 25 days holiday + bank holidays + your birthday off Enhanced pension scheme Private health insurance Dedicated learning & development budget Cycle to Work More ❯

Your experience as a Senior Rust Developer is required to join a motivated company in the gaming space, currently seeking a talented and experienced professional to work on projects serving a global community of enthusiasts. Noted for their record of successful projects and strong support from top investors, the company possesses exceptional expertise in their field, to which … blockchain or decentralized technologies. Enthusiasm for the subject matter and a genuine passion for technology. This is an awesome company doing awesome things. If you're a quality Rust Developer, then this one is for you. #J-18808-Ljbffr More ❯

Senior Backend Engineer Contractor (Java/Ruby focused) Fully Remote/EU-Based Rate £550-650pd, Outside IR35 12-months Contract Length We're supporting a fast-moving client at huge global scale, that is in need of a Senior Backend Contractor with deep experience across Java and Ruby . This is a high … impact freelance role within a tech-driven established team - building scalable systems in a modern backend environment. What You'll Be Doing as a Senior Backend Engineer Contractor (Java/Ruby focused) Fully Remote/EU-Based Rate £550-650pd Outside IR35 : Designing and building robust backend services across Java, Python, and Rust-based … secure coding, and clean architecture decisions Bringing in best practices across multiple programming paradigms and languages Ideally, supporting legacy Ruby codebases or integrations where needed Core Skills for the Senior Backend Engineer Contractor (Java/Ruby focused) Fully Remote/EU-Based Rate £550-650pd Outside IR35 : Senior-level backend experience with both Java More ❯

Profitable VC backed SMB SaaS 1 3 % equity UK visa sponsor Build core product used by 500+ restaurants Jelly is rebuilding the operating system for food businesses from the ground up. Kitchens in Michelin stars, pubs, cafes and hotels still More ❯