12 senior backend developer jobs found

Senior Backend Developer for Video on Demand and Live Streaming (GoLang) Contract 12 months OUTSIDE IR35 Remote (UK) A leading video platform is seeking experienced Senior Backend Developers with expertise in GoLang to contribute to the VoD2Live project. This person must have experience working on Streaming or Video on Demand click apply for full job details

Senior Backend Developer for Video on Demand and Live Streaming (GoLang) – Contract – 12 months – OUTSIDE IR35 – Remote (UK) A leading video platform is seeking experienced Senior Backend Developers with expertise in GoLang to contribute to the VoD2Live project. This person must have experience working on Streaming or Video on Demand. The role requires developing robust, high-performance backend services that integrate seamlessly with third-party services such as CDNs, DRM providers, and cloud platforms. This position is ideal for candidates with strong problem-solving skills and a deep understanding of video streaming protocols and microservices architecture. Key Responsibilities: · Develop functional and high-performing backend services that meet the platform's requirements. · Write high-quality, well-documented, and maintainable code. · Integrate the platform with necessary third-party services (CDNs, DRM providers, etc.). · Ensure comprehensive...

🤖 Senior Android Engineer – Fintech - 6m OUTSIDE contract 💷 Up to £500/day | Outside IR35 📆 6-Month Contract 📍 Central London – 3 days onsite We’re working with a leading fintech scale-up looking for an experienced Senior Android Engineer to join their mobile engineering team on an initial 6-month contract. 📱 This is a highly product-focused role, working on a major Android product build and creating polished, data-rich mobile experiences. You’ll have genuine end-to-end ownership , from initial idea and technical approach through to testing and release. 👨 💻 A senior doer This is an important one: they need someone senior who is still very close to the code. They’re not looking for a hands-off Lead, they want a highly technical, hands-on Senior Android Engineer who can make good architectural decisions but still enjoys getting stuck into the implementation. You’ll also need to be a confident, clear communicator who can articulate your...

Senior Software Engineer Full Stack Developer (Frontend most important) TypeScript or Express.js / Kotlin or Springboot / AWS Initial 6 Month Contract Fully Remote (UK Based) £525-550 per day, Outside IR35 Active SC required We're working with a UK Consultancy client who are putting a team together to deliver a high-profile Cloud-Native Government program. We need Senior Software Engineers who hold active SC Clearance, and have good Full Stack experience with Kotlin, Spring Boot (Java), Express.js or TypeScript, AWS and Terraform or AWS CloudFormation. The Frontend experience is preferable. Urgent Contracts starting ASAP, fully remote, paying up to £550 per day, Outside IR35. Initial 6 month engagement with long term extensions. Tech stack: Frontend (Frontend is the more important end of the stack for this role) Building UIs using Express.js and TypeScript GDS standards Nunjucks Integrating with the backend services Backend...

Senior PHP / Laravel Developer – Contract £350–£375/day | Outside IR35 | 3 Months | Immediate Start Northampton – 1 day per week onsite | UK-based contractors only PHP | Laravel | Vue.js | TypeScript | MySQL | REST APIs | AWS We’re looking for an experienced Senior PHP / Laravel Developer to join an established engineering team working on a successful global SaaS platform. This is an initial 3-month contract and a genuinely hands-on development role. PHP and Laravel are at the heart of the requirement, so we need someone with strong commercial Laravel experience who can get into an established codebase and start contributing quickly. What you'll be working on You'll be developing and improving backend services and product functionality across a modern SaaS platform, including: Hands-on PHP / Laravel development Building and integrating REST APIs Working with MySQL and relational databases Performance, scalability and application improvements Automated testing with...

Senior Full Stack .NET Developer - Contract C# | .NET | ASP.NET Core | Vue 3 | TypeScript | REST APIs £400 - £450 per day | Outside IR35 | Remote UK | Contract We're looking for an experienced Senior Full Stack .NET Developer / .NET Contractor to join a global SaaS engineering environment, working across backend services and a modern web application. This is a UK-based remote contract working with an international engineering team across the UK, New Zealand, US and Canada. You MUST be UK based to be considered. The Role You 'll be hands-on across C#, .NET, ASP.NET Core Web APIs, Vue 3 and TypeScript, developing new functionality and enhancing an established SaaS platform. You 'll work across: C# / .NET / ASP.NET Core / .NET 5+ Vue 3 / TypeScript / Composition API / REST APIs & backend services Automated testing & maintainable code GitHub & modern development practices AI-assisted development tools such as...

Android Developer (Contract, Outside IR35) Contract status: Outside IR35 Start date: 2nd November Contract length: To the end of December 2026, with extension possible Location: Remote first London days: Once or twice a month Who you'll be doing it for You'll join the mobile platform team on a UK government app, working on the app and the services that support it. The team builds and maintains the common parts of the app, such as login. It also brings in key features built by other teams, and manages app releases. You're engaged through hedgehog lab, a digital product consultancy and certified B Corp, also Great Place to Work certified. For 20 years we've helped public and private sector organisations through digital transformation. What you'll be doing You'll build and improve the common parts of the Android app, such as login, in Kotlin with Jetpack Compose. You'll also work on how features built by other teams fit into the app. When your...

TypeScript Backend Developer (Contract, Outside IR35) Contract status: Outside IR35 Start date: 2nd November Contract length: To the end of December 2026, with extension possible Location: Remote first London days: Once or twice a month Who you'll be doing it for You'll join the mobile platform team on a UK government app, working on the app and the services that support it. The team builds and maintains the common parts of the app, such as login. It also brings in key features built by other teams, and manages app releases. You're engaged through hedgehog lab, a digital product consultancy and certified B Corp, also Great Place to Work certified. For 20 years we've helped public and private sector organisations through digital transformation. What you'll be doing You'll build the services behind the app, as TypeScript Lambda functions on AWS. You'll set up authentication using OIDC, so people can sign in securely. You'll agree with the...

Integration Software Engineer/(IPaaS - Boomi - AWS) - UK CNI - OUTSIDE IR35 - ACTIVE SC CLEARANCE NEEDED Tecknuovo is a deliberately different digital consultancy, delivering secure, modern technology solutions while upskilling client teams to ensure zero long-term dependency. We are seeking an experienced Integration Engineer, Software Engineer, Backend Engineer or Java Developer to support a high-profile integration Proof of Concept within a large-scale UK government organisation responsible for delivering critical national services. This role would suit engineers with a strong background in API development, Back End engineering, system integration or Middleware technologies , who enjoy solving complex technical challenges and building scalable solutions in cloud-based environments. You do not need to come from a pure Boomi background. Whilst experience with Boomi is highly desirable, we are equally interested in engineers who have delivered...

Contract Python Engineers – 3–6 Month Contracts London / Hybrid | £650–£750 pd Outside IR35 I’m working with a heavily VC-backed financial services platform that is going through a really exciting period of global expansion. They’ve built their own technology offering using modern Python and are disrupting a traditionally legacy-heavy sector. They’re now looking to bring in three technically strong Python Engineers on an initial 3–6 month contract, with the potential for further work. This is a small, highly technical team, so they’re looking for engineers who can genuinely stand on their own two feet. You’ll be expected to work across the development lifecycle rather than relying on someone else to handle areas such as testing, architecture or data structures. They’d particularly like to speak with people who have worked in smaller engineering teams, start-ups or scale-ups, where you’ve had to take ownership rather than being one small part of a huge...

Lead Java Software Engineer (Java / Spring Boot / Kafka / Kubernetes) 6 months (initially) Remote-working (UK-based) Market Rates (£550 to £575 per day) Outside IR35 The Opportunity: ISR Recruitment is currently supporting a leading consultancy client seeking an experienced Lead Java Engineer to design, build and deliver backend services for a national data exchange platform enabling secure data sharing between organisations. This is a hands-on technical leadership role, with no line-management responsibility where you will remain actively involved in coding and technical design while mentoring developers, supporting delivery and helping shape technical solutions. The platform is underpinned by zero-trust security principles and you will join a remote engineering team of 20+ people working on secure, scalable and production-critical services. You will take high-level or lightweight requirements, clarify what is required, translate them into technical specifications and...

Location: London (once a month) Department: Engineering Employment Type: Contract - Outside IR35 Contract Length: 6 months (with potential for extension) About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done. About the role: As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and enthusiastic. You should be skilled in...