12 back end developer jobs found in London

Back End Developer (Node.js) Senior Software Engineer Pricing & Inventory (Node/TypeScript) Contract: 6 months initially Rate: Up to £420 per day, Outside IR35 Location: Can be worked fully remote We re supporting a high-traffic global E-commerce platform in its search for a Senior Software Engineer to improve its pricing, inventory and availability systems. This is a hands-on role focused on building reliable, scalable services that process millions of customer searches across multiple international markets. What you'll be working on Building and improving pricing, inventory and availability services Developing quote-caching and data freshness strategies Designing resilient APIs and third-party integrations Reducing latency and improving platform performance Balancing pricing accuracy with cache efficiency and infrastructure cost Improving monitoring, tracing and production observability Owning solutions from investigation through to...

Back End Developer £500-£540 per day | Outside IR35 Java | Spring Boot | Secure Microservices LocationLondon (MOD site) Working Pattern4 days per week onsite ClearanceCurrent DV Security Clearance required BackgroundMOD / Defence experience required The Opportunity We're looking for an experienced Back End Developer to help build the core services behind a next-generation Defence Intelligence platform. You'll develop secure, scalable microservices and APIs that support mission-critical operational workflows, working within a highly secure environment alongside multidisciplinary engineering teams. This is an excellent opportunity to contribute to the delivery of innovative digital capabilities supporting Defence operations. About the Programme This programme is delivering an AI-enabled Defence Intelligence capability designed to improve visibility of operational data, streamline complex workflows and support faster, more informed decision-making. Working as part of an...

Back End Developer £500-£540 per day | Outside IR35 Java | Spring Boot | Secure Microservices Location London (MOD site) Working Pattern 4 days per week onsite Clearance Current DV Security Clearance required Background MOD/Defence experience required The Opportunity We're looking for an experienced Back End Developer to help build the core services behind a next-generation Defence Intelligence platform. You'll develop secure, scalable microservices and APIs that support mission-critical operational workflows, working within a highly secure environment alongside multidisciplinary engineering teams. This is an excellent opportunity to contribute to the delivery of innovative digital capabilities supporting Defence operations. About the Programme This programme is delivering an AI-enabled Defence Intelligence capability designed to improve visibility of operational data, streamline complex workflows and support faster, more informed decision-making. Working as part of...

One of our media clients is looking for a Senior NetSuite Developer to support a wider NetSuite ERP implementation. Role: Senior NetSuite Developer (Procure-to-Pay) Location: Hybrid with 2-3 days a week in Central London Contract: Initial 3 months (Outside IR35) Day Rate: £540-£640pd Outside IR35 Start: ASAP/urgent requirement Company We are supporting a global organisation undergoing a significant finance transformation programme, centred on enhancing and scaling its NetSuite ERP environment. Operating across multiple international markets, the business is investing heavily in automation, systems integration, and process improvement to support continued growth and operational efficiency. The organisation has an established internal NetSuite leadership and architecture capability and is now looking to strengthen its development function with an experienced technical specialist who can translate solution designs into scalable, production-ready outcomes....

Front End Developer £500-£540 per day | Outside IR35 React | TypeScript | Secure, Analyst-Facing Applications LocationLondon (MOD site) Working Pattern4 days per week onsite ClearanceCurrent DV Security Clearance required BackgroundMOD / Defence / National Security experience required The Opportunity We're looking for an experienced Front End Developer to build intuitive, secure and role-aware interfaces for a next-generation Defence Intelligence platform. You'll work closely with UX Designers, Back End Developers and wider delivery teams to turn complex operational requirements into accessible, maintainable and high-performing applications that improve visibility, streamline workflows and support users in a mission-critical environment. This is an excellent opportunity to work on modern digital capabilities within a highly secure Defence environment. About the Programme This programme is delivering an AI-enabled Defence Intelligence capability designed to improve...

Full Stack Developer £500-£540 per day | Outside IR35 Java | Spring Boot | React | TypeScript | Secure Digital Platforms Location London (MOD site) Working Pattern 4 days per week onsite Clearance Current DV Security Clearance required Background MOD/Defence/National Security experience required The Opportunity We're looking for an experienced Full Stack Developer to help build and deliver secure, modern digital capabilities within a Defence environment. You'll work across both Front End and Back End development, contributing to scalable services, APIs and intuitive user interfaces. Working closely with UX Designers, Product, Engineering and Defence stakeholders, you'll help turn complex operational requirements into reliable, user-focused technology. This is an excellent opportunity for a Full Stack Developer who enjoys working across the technology stack and wants to contribute to high-profile, mission-critical digital programmes within a highly secure environment....

Front End Developer £500-£540 per day | Outside IR35 React | TypeScript | Secure, Analyst-Facing Applications Location London (MOD site) Working Pattern 4 days per week onsite Clearance Current DV Security Clearance required Background MOD/Defence/National Security experience required The Opportunity We're looking for an experienced Front End Developer to build intuitive, secure and role-aware interfaces for a next-generation Defence Intelligence platform. You'll work closely with UX Designers, Back End Developers and wider delivery teams to turn complex operational requirements into accessible, maintainable and high-performing applications that improve visibility, streamline workflows and support users in a mission-critical environment. This is an excellent opportunity to work on modern digital capabilities within a highly secure Defence environment. About the Programme This programme is delivering an AI-enabled Defence Intelligence capability designed to improve...

Job Title: Full Stack Python Developer - Claude Experience - OUTSIDE IR35 Location: Fully remote - US or UK based (must be able to work ET hours) Salary/Rate: $70 to 90 per hour Start Date: 01/09/2026 Job Type: Contract role - fully remote - 6 months Company Introduction We have an exciting opportunity now available with one of our sector-leading consultancy clients! They are currently looking for a skilled Full Stack Developer to join their team for a six-month contract. Job Responsibilities/Objectives The Senior Full Stack Engineer owns feature delivery on the client's B2B SaaS product serving home energy brands. Working under the direction of the Engineering Lead and the Product Owner, this role builds largely independently within our established stack and codebase: the architecture is set, the prototype exists, and the job is turning designs and specs into production features at 0-to-1 velocity. The ideal candidate is a senior, self-directed engineer...

Backend Developer, Azure Mainly remote, occasional travel to Derby Up to £425 per day Outside IR35 Initial 3-month contract We're supporting a business that needs an experienced Backend Developer to join a mature Azure platform team and contribute quickly across live sprint delivery. This is not a role for someone who needs heavy direction or a detailed brief handed to them for every piece of work. The team needs someone who can pick up requirements, ask the right questions, own their work end-to-end and deliver production-quality code from early in the assignment. The environment is Microsoft and Azure-led, with a Back End platform built around C#/.NET, Azure Functions, Azure API Management, Azure SQL, Service Bus and Azure DevOps. What you'll be doing You'll be responsible for building, enhancing and supporting Back End services across a live digital platform. This will include feature delivery, integration work, production support, testing, DevOps activity and working...

Senior Backend Rust Engineers | Outside IR35 | Fully Remote I'm looking for 2 Senior Backend Rust Engineers to join a major, long-term platform transformation programme. This isn't a short-term "come in and fix a few bugs" contract. The team are rebuilding and modernising a business-critical platform, there's a significant roadmap of engineering work ahead, and I'm looking for experienced engineers who want something they can properly get their teeth into. You'll be working hands-on across: • Rust • Backend services & APIs • Distributed systems • Cloud-native development • SQL & NoSQL databases • Modern AI-assisted software engineering I'm not looking for architects who have moved away from coding. I'm looking for experienced software engineers who still enjoy getting into the detail, solving difficult technical problems and building production systems. You don't need to have spent your entire career working exclusively with Rust either. A strong wider Back End...

Contract Mobile Developer (iOS/Flutter)- Likely outside IR35 Contract: 6 months (initial) Rate: Around £400 per day Location: Manchester, 2-3 days per week onsite I'm working with an exciting Manchester-based IoT technology business that's looking to bring in an experienced Mobile Developer to help evolve and enhance its mobile applications. This is a hands-on contract role within a growing engineering team where you'll have the opportunity to work on products that interact with connected devices used in the real world. What you'll be doing Developing and enhancing native iOS applications (Swift) Supporting Android development where required Contributing to cross-platform development using Flutter Building clean, maintainable and scalable mobile applications Working closely with firmware, Back End and product teams Helping shape technical decisions and improve development practices What we're looking for Strong commercial experience developing...

Senior Azure Logic Apps Developer Outside IR35 | £450 - £520 per day | Fully Remote (UK) | ASAP Start Primus Connect is working with a specialist Data, AI and Cloud consultancy, delivering advanced platforms for clients across financial services, healthcare, government and enterprise technology. They're looking for a Senior Logic Apps Developer to design, build and maintain enterprise-level integration solutions on Microsoft Azure. THE ROLE You'll be instrumental in bridging cloud services, on-premises systems and third-party applications using Azure Integration Services, with a primary focus on Azure Logic Apps. KEY RESPONSIBILITIES Architect, develop and deploy integration solutions using Azure Logic Apps (Standard & Consumption), API Management, Service Bus and related serverless technologies Design and build automated workflows using Power Apps and Logic Apps Build prototypes to demonstrate value Create complex workflows, transformations and API...