Staff .NET Backend Engineer

Staff .NET Backend Engineer (Contract) UK | Fully Remote (UK-based) | 6 months | £900/day (Outside IR35) High-growth Product Engineering Team Build and evolve core Back End services powering a large-scale property technology platform We're supporting a well-established, product-led technology business that's continuing to modernise and scale the Back End services behind its core platform. This is a critical engineering role within a mature but evolving environment, focused on building robust, cloud-native services that support real-world, high-volume usage. This role suits an experienced contractor who enjoys owning Back End systems end-to-end, working in production environments, and influencing how services are designed, built and shipped, not just delivering tickets. You'll operate as a Staff-level, hands-on engineer, embedded within a product squad and working closely with senior engineering leadership to set technical standards and deliver meaningful outcomes. The role This is a product-focused Back End engineering position, not a support or maintenance role: Design, build and ship cloud-native Back End services using C# and .NET (Core 8/9) Own features end-to-end, from early problem discussions through to production delivery Build and evolve event-driven systems using AWS serverless technologies Design and optimise data models across relational and NoSQL databases Create clean, well-documented APIs with a strong focus on developer experience Partner closely with BAs, Principal Engineers and delivery teams to shape solutions Influence architectural decisions and raise engineering standards across the squad Mentor engineers through code reviews, pairing and technical guidance You'll be joining a collaborative engineering group with strong technical leadership, clear ownership, and the space to make real impact. What they're looking for Senior/Staff-level Backend Engineer with strong ownership mindset Deep hands-on experience with C# and modern .NET in production environments Strong background in AWS serverless architecture (Lambda-first) Experience building distributed, event-driven systems Comfortable designing data models across SQL and NoSQL Able to work from high-level business problems to pragmatic technical solutions Confident communicator who can explain trade-offs to both technical and non-technical stakeholders Pragmatic and outcome-focused, values shipping, quality and maintainability over perfection Must have: AI-assisted/agentic development workflows Experience with AWS, Lambda and AWS serverless