6 senior backend engineer jobs found in London

Senior Backend Engineer (Contract) | NodeJS / C# / Kotlin / Java / Go | London Hybrid | £550/£600 per day | Contract They're looking for Senior Backend Engineers who can do more than simply pick up tickets. They want people who are technically strong, proactive and comfortable taking ownership of projects, working collaboratively with the wider engineering team and delivering reliable, high-quality systems. This is an opportunity to join a busy engineering environment where you'll be working on meaningful product integrations, solving complex technical challenges and helping deliver some of the business's highest-priority projects. What You'll Be Doing • Building and delivering backend integrations across a range of product initiatives. • Designing and building reliable, scalable backend systems. • Working across authentication and identity-related functionality. • Taking ownership of projects, from understanding requirements through to delivery. •...

Senior Backend Engineer (Contract) | NodeJS / C# / Kotlin / Java / Go | London Hybrid | £550/£600 per day | Contract They're looking for Senior Backend Engineers who can do more than simply pick up tickets. They want people who are technically strong, proactive and comfortable taking ownership of projects, working collaboratively with the wider engineering team and delivering reliable, high-quality systems. This is an opportunity to join a busy engineering environment where you'll be working on meaningful product integrations, solving complex technical challenges and helping deliver some of the business's highest-priority projects. What You'll Be Doing • Building and delivering backend integrations across a range of product initiatives. • Designing and building reliable, scalable backend systems. • Working across authentication and identity-related functionality. • Taking ownership of projects, from understanding requirements through to delivery. •...

Senior Backend Engineer (Contract) | NodeJS / C# / Kotlin / Java / Go | London Hybrid | £550/£600 per day | Contract They're looking for Senior Backend Engineers who can do more than simply pick up tickets. They want people who are technically strong, proactive and comfortable taking ownership of projects, working collaboratively with the wider engineering team and delivering reliable, high-quality systems. This is an opportunity to join a busy engineering environment where you'll be working on meaningful product integrations, solving complex technical challenges and helping deliver some of the business's highest-priority projects. What You'll Be Doing • Building and delivering backend integrations across a range of product initiatives. • Designing and building reliable, scalable backend systems. • Working across authentication and identity-related functionality. • Taking ownership of projects, from understanding requirements through to delivery. •...

🤖 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...

Contract Opportunity: Senior Front-End Engineer, Identity Integration 6 months | Outside IR35 | Hybrid, 2–3 days in London | £550–£700 per day (flexible) I’m working with a fast-growing fintech scale-up that has just been acquired by a global leader in financial and accounting software. As part of the acquisition, they’re bringing their platform together with one of the world’s most widely used small business accounting products. They need experienced contractors to help deliver that integration. The work centres on identity: connecting the two platforms so users can sign in and move between them securely and seamlessly. It’s a high-visibility project inside a newly combined business, with real technical ownership of the user-facing experience. What you’ll be doing: Building the user-facing sign-in, sign-up and account-linking journeys between the two platforms Implementing client-side authentication flows, including redirects, session handling and secure token...

We're working exclusively with an established investment management business seeking an experienced, hands-on Full Stack .NET Engineer to take a number of internally developed applications and prototypes through to production. The business has been using AI-assisted development tools, including Claude, to rapidly develop working prototypes and now requires an engineer with the technical depth to turn these into secure, scalable and maintainable production applications. This is a backend-leaning full-stack role, with a strong emphasis on C#/.NET, Azure, application architecture and data integration. You'll also need sufficient frontend development experience to deliver complete, functional applications. Working directly with senior business stakeholders in a small technical environment, you'll have considerable autonomy and responsibility for technical delivery. Key responsibilities Take existing applications and prototypes through to production. Design, develop and...