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 backend C#, API engineering and AWS skills, without being a security expert, you’ll ideally have some experience of AWS Cognito, AWS IAM and some Typescript.
What You’ll Bring
- Senior/Staff-level backend mastery in C# and .NET 9/10, capable of architecting and leading distributed REST microservices at scale.
- Advanced AWS serverless expertise including Lambda, API Gateway, SQS, SNS, Step Functions & EventBridge.
- Serious API engineering capability: versioning, documentation, throttling, rate-limiting, contract stability, DX-first design, and building APIs that other engineers love to consume.
- Some frontend experience with Typescript will be advantageous.
- Some real-world identity engineering: familiarity with AWS IAM, permission modelling, least-privilege design, cross-service auth patterns, and secure-by-default access controls.
- Some Hands-on experience with AWS Cognito: user pools, identity pools, OAuth2/OIDC flows, JWT validation, token lifecycles, and integrating Cognito-backed auth into API Gateway and Lambda.
- Data expertise across Aurora MySQL and DynamoDB: schema design, access patterns, indexing, query tuning, and pragmatic trade-offs around consistency, scale and cost.
- Event-driven architecture experience with SQS: idempotency, retries, ordering, DLQs, and operational resilience.
- Product-first mindset: comfortable shaping requirements, partnering with BAs, and operating without a traditional PO.
- Excellent communication skills and confidence in ad hoc client interaction.
- High engineering standards: Git-based workflows, trunk-based development, CI/CD (GitHub Actions), IaC (CDK/Terraform), comprehensive testing, and secure-by-default coding.
- Outcome-oriented pragmatism: comfortable with ambiguity and biased toward shipping.
What You’ll Own
- Architecting, building and shipping high-performance event driven services in C#/.NET 9/10 on AWS Lambda.
- Designing secure, scalable API architectures using API Gateway, IAM, Cognito, and modern identity patterns.
- Delivering resilient event-driven systems using SQS and related AWS messaging primitives.
- Owning features end-to-end: product thinking, scoping, trade-offs, sequencing and delivery.
- Championing engineering excellence: testing discipline, peer review, CI/CD quality, observability, performance and secure coding.
- Developing hands-on skills with Claude Code: agentic workflows, smart refactoring, automated context management, and productivity-boosting AI patterns.
Contract Details
£700–£800/day
Outside IR35
100% Remote (UK only)
8-month rolling contract
Rate:
£800/day
Location:
City of London
IR35 Status:
Outside
Remote Status:
Remote
Industry:
IT
Seniority Level:
Senior