Senior C# Developer.NET , AWS Lambda, SQS, SNS Outside IR35

Senior C# Engineer .NET 9/10, AWS Lambda, SQS, SNS OUTSIDE IR35

£700 £ 800 per day Outside IR35 ? 100% Remote 9 month rolling contract

Takeaway: Contribute to the architecture and build of a major greenfield B2B SaaS platform as a deeply senior, hands-on C# engineer, with heavy emphasis on deep .NET engineering
, high-performance distributed systems
, and real-world AWS serverless delivery
. Youll also have the opportunity to develop hands-on skills with Claude Code
, one of the most advanced AI-assisted development tools in the industry.

Role Overview:

Youll operate as the technical spearhead for a greenfield product build, reporting to the Director of Engineering. Expect deep backend engineering, distributed system design, and high-quality serverless delivery, plus the chance to adopt modern AI-assisted development practices as part of your workflow.

What Youll Bring:

• Senior/Staff-level backend mastery in C# and .NET 9/10
  , with the ability to architect and lead distributed REST microservices at scale.
• Strong authority in AWS serverless ...