7 contract software engineer jobs found in London

Senior Java & Kotlin Backend Engineer Location: London (Hybrid - Wednesday office attendance required) Contract: Initial 2 months IR35: Outside IR35 Start Date: ASAP The Role We 're working with a leading technology organisation seeking an experienced Senior Java & Kotlin Backend Engineer to join their engineering team on an initial two-month contract. This role offers the opportunity to contribute to greenfield backend development, building scalable, cloud-native microservices within a modern engineering environment. You 'll work alongside cross-functional teams to design, develop and deliver high-quality backend solutions that are secure, reliable and built for scale. Key Responsibilities Design, develop and maintain backend services using Java and Kotlin. Build and enhance RESTful APIs within a microservices architecture. Develop secure, scalable and high-performance applications. Collaborate with...

Remote Contract (UK Candidates only) Ideal start date: ASAP Contract Duration: 6 Months Outside IR35 Rate: £500-600 p/d Elsewhen, a London-based consultancy, designs and builds technology solutions for clients like Spotify, Google, Inmarsat, and Zego. Over the past decade, we have built a workplace prioritising impact, drive, and friendliness. We value outcomes over hours and agility over rigid processes. Work Environment: Fully Remote in the UK Join our team:https://www.elsewhen.com. We are looking for a talented Senior AI Engineer to join a brand new delivery squad focused on solving new client problems in 4-week cycles. Each project is designed to produce a working pilot that demonstrates clear value, not a polished long-term system. You’ll work in a 4-person team (AI Engineer, Product Manager, Data Scientist, Principal for AI Engineering), using AI coding tools (e.g. Claude Code) to reduce build time and get solutions into a...

Remote Contract (UK Candidates only) Ideal start date: ASAP Contract Duration: 6 Months Outside IR35 Rate: £500-600 p/d Elsewhen, a London-based consultancy, designs and builds technology solutions for clients like Spotify, Google, Inmarsat, and Zego. Over the past decade, we have built a workplace prioritising impact, drive, and friendliness. We value outcomes over hours and agility over rigid processes. Work Environment: Fully Remote in the UK Join our team:https://www.elsewhen.com. We are looking for a talented Senior AI Engineer to join a brand new delivery squad focused on solving new client problems in 4-week cycles. Each project is designed to produce a working pilot that demonstrates clear value, not a polished long-term system. You’ll work in a 4-person team (AI Engineer, Product Manager, Data Scientist, Principal for AI Engineering), using AI coding tools (e.g. Claude Code) to reduce...

QA Engineer – Remote | £475–£500/day | Outside IR35 - 3 Month Contract We are looking for an experienced QA Engineer to join our team on a 3 month contract. This role is paying £475–£500 per day and is Outside IR35 . You will be responsible for ensuring the quality and reliability of API integrations and payment-related workflows, working closely with developers to validate new features, identify defects, and support the delivery of robust, high-quality software. Core Requirements Strong commercial experience testing C#/.NET APIs Hands-on experience with testing tools such as Postman, REST Assured, Playwright , or similar automation/testing frameworks Experience testing webhooks , asynchronous event-driven workflows , and terminal/POS transaction flows Solid understanding of API testing, debugging, and validating request/response behaviour Experience creating and executing test cases, identifying defects, and working collaboratively with development...

Full Stack Engineer - Azure, C#, .Net, React / ReactJS Outside IR35 12 Month Contract Fully Remote (UK only) £375 - 425 Per Day We 're currently working with a London based MedTech company who are searching for a Full Stack Engineer who has extensive experience working with Azure, C#, .Net and React / ReactJS. This project will see you working alongside a small existing team of developers, adding additional capacity to make business critical updates and enhancement to their existing Azure based core platform, with the bulk of the work will focus on enhancing the workflow engine! We are looking for an experienced Full Stack Engineer who is comfortable working on complex software platforms and is able to get up to speed quickly in new environments. Required Skills / Experience Extensive commercial experience with: Azure - Azure Functions, Azure API Management, Azure Services, Azure B2C Directory, Azure...

We're working with an innovative UK technology business that's transforming the way scientific organisations analyse complex imaging data. They're entering an exciting phase of product development as they evolve a proven proof-of-concept into a scalable, enterprise-grade AI SaaS platform. They're looking for a Senior Full Stack Engineer to join the team on an initial 6-month contract, taking ownership of key platform features across the full technology stack while helping shape the technical direction of a next-generation AI product. You'll play a key role in building a production-ready, cloud-native SaaS platform that combines modern web technologies with machine learning capabilities. Working closely with Product, Design and Engineering, you'll take features from concept through to deployment, delivering scalable, secure and maintainable solutions. This is a hands-on engineering role with plenty of autonomy, ideal for someone who enjoys working in fast-moving product...

We are seeking an experienced and customer-focused Senior 2nd Line Support Engineer to become the face of IT for a busy corporate office in West London. This is more than a traditional desktop support role. You will act as the primary onsite technology partner for approximately 100 users, delivering an exceptional support experience while working closely with an external Managed Service Provider (MSP) to continually improve service delivery. The successful candidate will combine excellent technical capability with outstanding customer service, strong stakeholder management and the ability to take ownership of small technology projects and operational improvements. Location: West London (On-Site) Working Pattern: 4-5 days per week on-site Contract: Initial 6 months Start: ASAP Key Responsibilities End User Support Deliver high-quality onsite 2nd Line support for approximately 100 users Resolve hardware, software and application issues quickly and...