£700 - £800 per day
Outside Spy
Remote (United Kingdom)
Senior C# Engineer - .Net, Typescript, Lambda, API Gateway, SQS, SNS, Cognito - OUTSIDE IR35 £700 - £800 per day Outside IR35 100% Remote 8-month rolling contract Play a pivotal role in architecting and delivering a major greenfield B2B SaaS platform as a senior, hands-on, Back End C# engineer. Expect serious Back End engineering, high-performance event driven systems, and production grade AWS serverless delivery with an elevated focus on API engineering , identity & access , and secure-by-default service design . You'll also gain hands-on experience with Claude Code and modern agentic development workflows. Role Overview: You'll act as the technical spearhead for a greenfield product build, reporting to the Director of Engineering and working closely with their IAM Technical Lead. In addition to deep Back End C#, API engineering and AWS skills, without being a security expert, you'll ideally have some experience of AWS Cognito, AWS IAM...