21 backend engineer jobs found

Role: Backend Kotlin Engineer Location: London Status: Outside IR35 Rate: Neg Duration: Initial 3 months (Extensions due) Role We're hiring a Backend Engineer with strong Kotlin experience to join our team. This role offers full flexibility - work from our London or Manchester office, or remotely, whichever suits you best. What you'll do: Build and maintain Back End services and APIs using Kotlin Write clean, well-tested, maintainable code Work closely with product and engineering teams to deliver new features Participate in code reviews and contribute to engineering best practices What we're looking for: Solid experience developing Back End applications in Kotlin Good understanding of Back End architecture and API design Ability to work independently in a remote or hybrid environment Strong communication skills, especially important for remote collaboration

Role: Backend Kotlin Engineer Location: Manchester Status: Outside IR35 Rate: Neg Duration: Initial 3 months (Extensions due) Role We're hiring a Backend Engineer with strong Kotlin experience to join our team. This role offers full flexibility - work from our London or Manchester office, or remotely, whichever suits you best. What you'll do: Build and maintain Back End services and APIs using Kotlin Write clean, well-tested, maintainable code Work closely with product and engineering teams to deliver new features Participate in code reviews and contribute to engineering best practices What we're looking for: Solid experience developing Back End applications in Kotlin Good understanding of Back End architecture and API design Ability to work independently in a remote or hybrid environment Strong communication skills, especially important for remote collaboration

Senior Backend Engineer - Node.js / TypeScript 12-Month Contract Fully Remote Outside IR35 We’re looking for a Senior Backend Engineer to join an exciting fintech business, working on highly scalable, mission-critical financial systems. The role is heavily focused on Node.js, TypeScript and AWS , with genuine ownership across the full lifecycle — from system design and architecture through to development, release and production support. You’ll have the opportunity to work on new products and capabilities from an early stage , making key technical decisions and helping shape how the platform evolves. What you’ll be working on Design, build and operate reliable, scalable backend services Own areas of the platform, including architecture and technical direction Build resilient APIs and distributed systems within a regulated financial environment Work with AWS serverless technologies , including Lambda, SQS, EventBridge and API Gateway Work with MongoDB and...

Senior Backend Engineer - Node.js/TypeScript 12-Month Contract | Fully Remote | Outside IR35 We're looking for a Senior Backend Engineer to join an exciting fintech business, working on highly scalable, mission-critical financial systems. The role is heavily focused on Node.js, TypeScript and AWS , with genuine ownership across the full lifecycle — from system design and architecture through to development, release and production support. You'll have the opportunity to work on new products and capabilities from an early stage , making key technical decisions and helping shape how the platform evolves. What you'll be working on Design, build and operate reliable, scalable Back End services Own areas of the platform, including architecture and technical direction Build resilient APIs and distributed systems within a regulated financial environment Work with AWS serverless technologies , including Lambda, SQS, EventBridge and API Gateway Work with MongoDB and...

Senior Platform Engineer (Cloud Media Platforms) Start ASAP (within 2-4 weeks notice) expected duration 6+ months initially London- Hybrid 2/3 days typically wfh/West London £450-470pd Outside IR35 Must have right to work in the UK and be based near London. Senior Platform Engineer (Cloud Media Platforms) providing technical design and development/implementation of systems that industrialise media workflows. Acting as the primary technical authority for Cloud NAS integration, media ingest pipelines, & automated metadata scripting. Prior experience in the media broadcasting industry, specifically with digital asset management, Cloud NAS, and video ingest or similar workflows is required. You will need strong Cloud DevOps skill set, hands on scripting of either Python, Go, or Node.js for automation and API development, hands-on expertise with AWS (preferred) or GCP and Infrastructure as Code (Terraform) etc Senior Platform Engineer (Cloud Media Platforms) Job...

Senior Platform Engineer (Cloud Media Platforms) Start ASAP (within 2-4 weeks notice) expected duration 6+ months initially London- Hybrid 2/3 days typically wfh/West London £450-470pd Outside IR35 Must have right to work in the UK and be based near London. Senior Platform Engineer (Cloud Media Platforms) providing technical design and development/implementation of systems that industrialise media workflows. Acting as the primary technical authority for Cloud NAS integration, media ingest pipelines, & automated metadata scripting. Prior experience in the media broadcasting industry, specifically with digital asset management, Cloud NAS, and video ingest or similar workflows is required. You will need strong Cloud DevOps skill set, hands on scripting of either Python, Go, or Node.js for automation and API development, hands-on expertise with AWS (preferred) or GCP and Infrastructure as Code (Terraform) etc Senior Platform Engineer (Cloud Media Platforms) Job...

Contract: 1 month initially Rate: £500 per day Location: Fully remote Status: Outside IR35 We're looking for an experienced JavaScript/TypeScript Engineer with strong hands-on experience across Next.js, NestJS to join us on a short-term contract and help build and improve an Android fitness app. This is an opportunity to work on a fast-moving, product-led application with a strong focus on AI-assisted development, modern JavaScript engineering and efficient delivery workflows. You'll be joining at an important stage of the product, so we're looking for someone who can hit the ground running, work independently and deliver high-quality features quickly. What you'll be doing Building and improving features for an Android fitness app using Next.js and NestJS. Working across the TypeScript stack, including APIs, integrations and application architecture. Collaborating remotely with the product and engineering team to deliver outcomes quickly. Using Claude, agentic...

My client has a need for an experienced Android Engineer to join their team for an initial 8 week piece of work with potential to extend. This is a hybrid role and is outside of IR35 Android (primary depth) Kotlin and modern Android in large production codebases; Jetpack Compose alongside Legacy View-based UI Multi-module builds: reading, untangling and mapping them, including convention plugins and version catalogues DI frameworks and the ability to derive actual runtime structure from wiring Architectural patterns in practice (MVVM, MVI, Clean-style layering), and the ability to identify what a codebase genuinely does Code archaeology and analysis Navigating an unfamiliar large codebase quickly and systematically Static analysis, dependency graph extraction, module dependency visualisation, code search at scale Reading CI/CD pipelines as a source of architectural truth: Fastlane, Bitrise, GitHub Actions, Jenkins, Gradle/Xcode build logic Reconstructing runtime...

Contract: 1 month initially Rate: £500 per day Location: Fully remote Status: Outside IR35 We 're looking for an experienced JavaScript/TypeScript Engineer with strong hands-on experience across Next.js, NestJS to join us on a short-term contract and help build and improve an Android fitness app. This is an opportunity to work on a fast-moving, product-led application with a strong focus on AI-assisted development, modern JavaScript engineering and efficient delivery workflows. You 'll be joining at an important stage of the product, so we 're looking for someone who can hit the ground running, work independently and deliver high-quality features quickly. What you 'll be doing Building and improving features for an Android fitness app using Next.js and NestJS. Working across the TypeScript stack, including APIs, integrations and application architecture. Collaborating remotely with the product and engineering team to deliver...

Flutter Engineer – Contract – Outside IR35   I’m currently supporting a client looking for an Mid/ Senior Flutter Engineer to join them on a contract basis.   They currently outsource a large part of their development to an agency in Europe and are looking to bring someone in-house who can take ownership of the mobile side and help improve communication between the internal and external teams.   Key skills: Strong commercial Flutter / Dart experience Ideally some React/ React Native Exposure Experience building and maintaining production mobile applications Comfortable reading and understanding Python / Django code Strong understanding of APIs and backend integrations Able to work closely with backend engineers and external development teams Strong communication and ownership   📍 Remote – 1 day per month in Farringdon, London 💰 £300–£400 per day 📅 Contract...

🚀 Senior C# Developer – Investment Banking £750/day | Outside IR35 | 12-month rolling contract | Largely Remote I’m working with a leading investment bank looking for a strong Senior C# Developer to join a long-term project building and enhancing a large-scale Structured Notes platform . This is a hands-on engineering role with approximately 80% backend C# / 20% frontend , working on complex, distributed systems. The role: You’ll be working across a modern .NET platform, designing and developing scalable backend services while contributing to the Angular frontend where required. The environment involves large-scale distributed systems, asynchronous processing, multithreading and event-driven architecture. Core technical requirements: • Excellent C# / .NET development experience • Strong .NET 8 knowledge • Previous commercial Event Sourcing experience – essential • Strong understanding of multithreading, concurrency and asynchronous...

Contract -Senior Software Engineer (Frontend Focus) - React / Next.js Newcastle / Remote £550 per day | Outside IR35 ASAP Start | Initial 3 Months We 're working with a client delivering a major digital transformation programme and are looking for an experienced Senior Software Engineer to join their high-performing Agile team. This is a hands-on engineering role with a strong focus on modern frontend development, working on customer-facing applications built with React and Next.js. You 'll be involved in technical delivery from day one, while also working closely with stakeholders, supporting customer engagements, and coaching less experienced developers across the team. The role is predominantly frontend-focused (around 75%), making it ideal for someone who enjoys building intuitive user experiences while influencing technical direction and best practice. Skills Strong commercial experience developing applications with React and Next.js Extensive...

We are seeking a passionate Software Engineering Manager who will provide technical expertise and operate with excellence. Being creative, curious, and confident, you will be an integral part of our empowered, self-managing, multi-disciplinary engineering teams - designing, building, releasing, and maintaining products. You will play a key role in driving our ambition to create a best-in-class software engineering team, environment, and culture. This is an initial 12 month contract (outside IR35) that requires you to work on client site 3 days a week in London, Paddington. Requirements Your key accountabilities will include: Team Management: Build, mentor, and manage a high-performing software engineering team. Foster a culture of collaboration, innovation, and continuous improvement within the team. Facilitate communication and collaboration among team members. Ensure budgets, people and resource allocation, and workload, balance across projects. Agile...

Enterprise Integration Developer – ERP / Billing Systems (Contract) SourceWise is looking for an experienced, hands-on Enterprise Integration Developer to support a major technology client building integrations between modern APIs and enterprise ERP and billing platforms. The role will focus on designing and delivering production-grade connectors between external APIs and platforms such as Workday, Salesforce, Microsoft Dynamics, Zuora or similar enterprise systems . We are looking for someone who has personally built, deployed and supported enterprise integrations , rather than someone whose experience is primarily functional configuration, implementation consulting or advisory work. What you’ll be doing Design and build integrations between enterprise ERP/billing platforms and external APIs. Develop native applications, extensions, plugins or workflow automations within your specialist enterprise platform. Trigger integrations from business events such as...

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,...

Senior Javascript Engineers (Contract) | UK based (Hybrid - London) | £550–£600 per day (Outside IR35)   We're supporting a fast-growing digital business that's investing heavily in its engineering capability and is looking for an experienced Senior Node.js Engineer to join a high-performing product team.   This isn't a role for someone who only knows one language. They're looking for polyglot engineers who understand software engineering fundamentals and are comfortable working across different technologies to solve complex problems.   You'll be:   Building and evolving high-scale backend services with Node.js & TypeScript Designing clean, scalable and maintainable solutions Working closely with Product, Engineering and Platform teams Contributing to architecture and technical decision-making Writing high-quality, well-tested code Mentoring engineers and driving engineering best practice...

Senior Javascript Engineers (Contract) | UK based (Hybrid - Leeds) | £550–£600 per day (Outside IR35)   We're supporting a fast-growing digital business that's investing heavily in its engineering capability and is looking for an experienced Senior Node.js Engineer to join a high-performing product team.   This isn't a role for someone who only knows one language. They're looking for polyglot engineers who understand software engineering fundamentals and are comfortable working across different technologies to solve complex problems.   You'll be:   Building and evolving high-scale backend services with Node.js & TypeScript Designing clean, scalable and maintainable solutions Working closely with Product, Engineering and Platform teams Contributing to architecture and technical decision-making Writing high-quality, well-tested code Mentoring engineers and driving engineering best practice...

Senior Javascript Engineers (Contract) | UK based (Hybrid - Manchester) | £550–£600 per day (Outside IR35)   We're supporting a fast-growing digital business that's investing heavily in its engineering capability and is looking for an experienced Senior Node.js Engineer to join a high-performing product team.   This isn't a role for someone who only knows one language. They're looking for polyglot engineers who understand software engineering fundamentals and are comfortable working across different technologies to solve complex problems.   You'll be:   Building and evolving high-scale backend services with Node.js & TypeScript Designing clean, scalable and maintainable solutions Working closely with Product, Engineering and Platform teams Contributing to architecture and technical decision-making Writing high-quality, well-tested code Mentoring engineers and driving engineering best practice...

Senior Android Engineer (Contractor) Location: Manchester city centre, 2 days/week onsite + remote 3 days/week Contract: Initial 3-4 month contract (strong likelihood of extension) Rate: £400-500 (Outside IR35) Start Date: Early October Overview Are you looking to make a genuine, visible impact in a short window rather than settle into a long slow ramp-up? This role offers exactly that. We're looking for an experienced Senior Android Engineer to join the Digital Engineering team of a well-known UK consumer brand, on a hands-on delivery contract supporting a significant new customer-facing proposition. The Android app is a modern, Kotlin-first, Jetpack Compose-only application built on multi-module clean architecture, with an established in-house permanent engineering team already in place. This is a genuine delivery role for someone who can get up to speed fast, ship high-quality software without unnecessary ceremony, and leave the codebase in a better state than they found...

We’re looking for an EPOS & SCO Platform Engineer to build, configure, and support the in-store point of sale and self-checkout platforms across the estate. You’ll own the full lifecycle of Travel Money Kiosks, EPOS and Hospitality infrastructure, including till hardware, self-checkout units, peripherals, and backend systems—ensuring services are secure, compliant, resilient, and consistently deployed at scale. You’ll automate provisioning, configuration, updates, and monitoring so stores benefit from reliable transaction processing, seamless customer journeys, and minimal downtime. Success means stable retail operations, predictable performance, and confidence from store colleagues, product owners, and operations teams. This is a hybrid role where 3 days per week are expected on site in Bracknell. Requirements Role Responsibilities: Design, build, and maintain EPOS and SCO infrastructure (Tills, Self-Checkouts, peripherals, controllers) across Windows...