25 of 25 Backend Developer Jobs in London

Senior Backend Developer (Java/Kotlin). Public Sector Contract. Transform Crime Data Management and Make a Difference. Up to £700 a day Inside IR35. 6 Month contract. Hybrid working from a hub of UK wide offices. Join the Electronic Monitoring team, a dedicated group focused on revolutionising … This Assignment: - Impactful Work: Contribute to a project that directly supports law enforcement and community safety. - Innovative Environment: Be at the forefront of developing backend infrastructure that processes crime data efficiently. - Professional Growth: Engage with cutting-edge technologies and methodologies, enhancing your skill set and career trajectory. Key Responsibilities ...

Senior Backend Developer - Ruby/Elixir Location: London - Remote Outside IR35 Immediate starter. We're supporting a technology business undertaking a major modernization programme and are looking for a Senior Backend Developer to drive a large-scale refactoring initiative across a complex, multi-service platform. This … with pragmatic technical leadership to deliver safer, faster, and more scalable services. What you'll be doing: Lead end-to-end refactoring across multiple backend technology stacks Redesign and modernise the messaging and event architecture Improve database performance, reliability, and schema design Reduce technical debt while keeping business disruption ...

Senior Backend Developer - Node Crypto Payments Remote- (HQ: London) 50k-100k Plexus has a great opportunity with one of our long-term clients in the global payments space. They are an established next-generation payments company, allowing users to accept payment methods across 13 different blockchain networks. They … looking for senior backend developer to join the team to working with node to build out their platform further. Responsibilities: Design & build wallet backend services, a rchitect and implement scalable Node.js services for wallet operations Blockchain integration, w ork with full nodes, third-party RPC providers ...

Senior Backend Developer - Ruby/Elixir Location: London - Remote Outside IR35 Immediate starter. We're supporting a technology business undertaking a major modernization programme and are looking for a Senior Backend Developer to drive a large-scale refactoring initiative across a complex, multi-service platform click ...

Senior Backend Developer - Node Crypto Payments Remote- (HQ: London) 50k-100k Plexus has a great opportunity with one of our long-term clients in the global payments space. They are an established next-generation payments company, allowing users to accept payment methods across 13 different blockchain networks. They … looking for senior backend developer to join the team to working with node to build click apply for full job details ...

Backend Developer (Contract) Start Date: ASAP Contract Length: 12 months Rate: Up to £570 per day inside IR35. Location: Mostly remote, with occasional travel to Croydon Clearance: SC Clearance required About the Role We're looking for an experienced Backend Developer to join a high-impact … project delivering scalable, reliable backend services. You'll work with modern Java-based technologies in a collaborative, delivery-focused environment, contributing to systems that are critical, secure, and built to scale. This is a contract role offering long-term stability, flexibility through remote working, and the opportunity to work ...

client is seeking an experienced Senior Backend Developer to support a major digital programme delivering secure, scalable backend systems. This role focuses on building modern cloud-based microservices, APIs, and data processing services in a highly collaborative and delivery-driven environment. You will work closely with multidisciplinary … analysts, and operational teams to design and deliver robust, reusable solutions that can be leveraged across multiple programmes. Key Responsibilities Design, develop, and maintain backend services within a microservices architecture. Build secure, scalable APIs for data exchange between systems. Develop and deploy cloud-native services using AWS infrastructure. Build ...

Company Description Fintech start-up based in London. Role Description This is a full-time Junior Backend Developer role based in London. In this role, you will be responsible for designing, building, and optimizing backend services, writing clean and efficient code, and collaborating with developers to integrate … include troubleshooting and debugging applications, ensuring optimal performance, and staying up to date with emerging technologies to improve development practices. Qualifications Strong understanding of backend programming languages and frameworks such as Python, Java, Node.js, or related technologies Experience working with databases, including SQL and NoSQL systems Familiarity with ...

Senior Backend Engineer 📍 London (Hybrid) 🚀 Early-Stage | AI Platform | Enterprise-Grade Systems We’re partnering with an ambitious early-stage AI company building a challenge-based interview intelligence platform. The product replaces CV-noise with real signal — evidence from real work and real human capability. They’re in full … build mode toward launch. Small team. High standards. High ownership. No corporate theatre. They’re hiring a Senior Backend Engineer to build the enterprise backbone of the platform — high-concurrency APIs, event-driven systems, and reliability foundations that transform complex hiring inputs into secure, trusted, GDPR-safe outputs. ...

payment processing and automated revenue share management to boost business efficiency. Job Description NOQ Group is on the lookout for a highly experienced Lead Backend Developer with expertise in Node.js, AWS, NoSQL (MongoDB), and SQL databases (PostgreSQL). The ideal candidate will have a deep understanding of systems … EKS. Experience working in fast-growing and scaling startups is crucial. This role will require you to collaborate across different functions and lead the backend development of our platform. Responsibilities Lead the design, development, and deployment of scalable backend services and infrastructure. Build, and maintain efficient, reusable ...

skills can be applied meaning a vast array of opportunities are now available to you. Examples of some of these are listed below: - Junior Developer Website Support Developer Junior Web Developer Content Editor Wordpress Developer Junior Software Developer Junior Front or Back End Development Development ...

operate like a top-tier creative engineering studio: small team, high taste, high ownership, no corporate theatre. We’re hiring a Senior Backend Engineer to build the enterprise backbone: high-concurrency APIs, event-driven systems, and reliability foundations that turn messy hiring inputs into trusted signal : fast, secure, GDPR ...

services millions of people love. And we do it all right here at Sky. What you'll do Design and implement scalable APIs and backend services, primarily in Scala, to integrate ML models into production systems and deliver personalised experiences. Real time data processing and gRPC microservices (Typelevel stack … cloud technology - even if you haven't worked extensively in ML before. Demonstrated experience designing, implementing, deploying, and maintaining production-grade APIs and backend services, including responsibility for reliability, performance, and on-call support. Hands-on experience working with data processing frameworks and distributed systems used to ingest, process ...

services millions of people love. And we do it all right here at Sky. What you'll do Design and implement scalable APIs and backend services, primarily in Scala, to integrate ML models into production systems and deliver personalised experiences. Real time data processing and gRPC microservices (Typelevel stack … cloud technology - even if you haven't worked extensively in ML before. Demonstrated experience designing, implementing, deploying, and maintaining production-grade APIs and backend services, including responsibility for reliability, performance, and on-call support. Hands-on experience working with data processing frameworks and distributed systems used to ingest, process ...

services millions of people love. And we do it all right here at Sky. What you'll do Design and implement scalable APIs and backend services, primarily in Scala, to integrate ML models into production systems and deliver personalised experiences. Real time data processing and gRPC microservices (Typelevel stack … cloud technology - even if you haven't worked extensively in ML before. Demonstrated experience designing, implementing, deploying, and maintaining production-grade APIs and backend services, including responsibility for reliability, performance, and on-call support. Hands-on experience working with data processing frameworks and distributed systems used to ingest, process ...

services millions of people love. And we do it all right here at Sky. What you'll do Design and implement scalable APIs and backend services, primarily in Scala, to integrate ML models into production systems and deliver personalised experiences. Real time data processing and gRPC microservices (Typelevel stack … cloud technology - even if you haven't worked extensively in ML before. Demonstrated experience designing, implementing, deploying, and maintaining production-grade APIs and backend services, including responsibility for reliability, performance, and on-call support. Hands-on experience working with data processing frameworks and distributed systems used to ingest, process ...

scientists and chemists. All positions at CheMastery come with an extraordinary level of freedom to showcase your skill . Description The position as a Backend Python Developer is a permanent full-time position. As a Python Developer you will have be part of a brilliant software ...

Lead Backend Software Developer (Contract) London, Outside IR35 £500-£600 per day This is an exciting opportunity to join a fast-moving engineering function at a pivotal moment of technical uplift. They are investing heavily in strengthening their core platforms and commercial data systems, creating a strong mandate … step in, lead, and make an immediate impact. The Company They are a growing digital gaming organisation operating across multiple markets, currently modernising their backend ecosystem. With distributed teams across the UK and Europe, they are building scalable platforms that support a variety of customer-facing and internal products. ...

Senior Backend Engineer – Product Team - £100 000 plus equity You'd thrive on building distributed systems that matter. Not the kind that serve AI cat photos and videos, we're talking about the kind that protect countries from escalating cyber warfare. You're about to optimise for national security … cybersecurity, building distributed systems that NATO countries depend on to defend against malicious threats. What You'll Build You'll design the core backend services powering large-scale binary analysis systems that process 200,000 binaries daily — and then scale that to millions and beyond. UK and US defence ...

Back End Developer/SRE (Java JVM) London/WFH to £110k Are you a Back End Developer/SRE with a strong knowledge of Java and JVM internals? You could be progressing your career in an impactful role at a global Fintech that has been consistently voted … organising events and projects that foster an open, diverse and inclusive culture Plus a range of other perks Your role: As a Back End Developer/SRE you will collaborate with development teams, as a trusted technical advisor to influence system design, ensuring reliability standards and driving improvements across ...

IDAM Back-end Java Developer - SC Cleared Rate: £500 - £535 a day IR35 : Inside IR35 Location: Remote within the UK Duration: Initially 6 months Clearance: Active SC Clearance required You will join a global IT consultancy who are delivering digital transformation to public sector body. They are looking … back-end Java Developer with proven IDAM (Identity and Access Management) experience. You will be part of a continuous improvement squad delivering enhancements and new features alongside BAU work (i.e. incidents and support maintenance activities). In addition, you will be involved in helping our client transform their IDAM ...

Back End Developer/Engineer III (Java/GCP) Duration:1 year contract Location:London New office Mode:Hybrid(2-3 days in office) We are looking for a high-impact Back End Engineer to lead solution designs and execute end-to-end implementations of critical service capabilities. Based ...

Back End Developer/Engineer III (Java/GCP) Duration:1 year contract Location:London New office Mode:Hybrid(2-3 days in office) We are looking for a high-impact Back End Engineer to lead solution designs and execute end-to-end implementations of critical service capabilities. Based ...

Back End Developer/Engineer III (Java/GCP) Duration:1 year contract Location:London New office Mode:Hybrid(2-3 days in office) We are looking for a high-impact Back End Engineer to lead solution designs and execute end-to-end implementations of critical service capabilities. Based ...

Back End Developer/SRE (Java JVM) London/WFH to £110k Are you a Back End Developer/SRE with a strong knowledge of Java and JVM internals? You could be progressing your career in an impactful role at a global Fintech that has been consistently voted ...