Contract

Senior Platform / Backend Engineer

Ref: BBBH68140_1788434539

Cambridge, Cambridgeshire

Whitehall Resources currently require an experienced Senior Platform / Backend Engineer to work for a key client based in Cambridge

**Please note this role falls inside IR35 and will be onsite 2 days a week in Cambridge**

Essential Skills:
* TypeScript & common packages/frameworks (NestJS/Fastify etc.)
* Policy Engines (Cerbos, opa, cedar etc.)
* Authorisation Patterns (ABAC, RBAC etc.)
* Authentication Systems (oauth, OIDC, EntraID OBO, JWT/JWKS, Basic Auth etc.)
* Advanced Database Design (PostgreSQL, migrations, common packages & extensions)
* API Patterns & integrations (REST, GraphQL)
* Software Architecture Patterns (Modular Monolith etc.)
* Best Practices (OWASP, OOP, SOLID, DRY, DDD, contracts, integrations, security, backend workers etc.)
* Monitoring & Telemetry (OTEL, DynaTrace etc.)
* VCS & CICD (GitLab)
* Spec driven AI development (e.g. Codex, Claude Code, Cursor or Kiro – NOT vibe coding!)
* OpenAPI / Swagger spec
* GitLab
* Terraform / Ansible
* Spacelift
* Docker/Kubernetes/Helm
* CI/CD

All of our opportunities require that applicants are eligible to work in the specified country/location, unless otherwise stated in the job description.

Whitehall Resources are an equal opportunities employer who value a diverse and inclusive working environment. All qualified applicants will receive consideration for employment without regard to race, religion, gender identity or expression, sexual orientation, national origin, pregnancy, disability, age, veteran status, or other characteristics.