Application Developer

Application Developer Identity & API Engineering (Contract)

Location:

Hybrid Sheffield

Contract:

Until end of year (Inside IR35) Sector:
Financial Services We are working with a leading financial services organisation who are looking to engage a highly skilled Application Developer to support the build-out of modern, cloud-native identity and access management (IAM) capabilities. This contract role is focused on developing secure identity APIs, event-driven workflows, and automation across Google Cloud Platform , supporting enterprise-scale identity lifecycle management and access orchestration.

You will work closely with cloud security, Dev Ops, platform, and application engineering teams to deliver scalable, secure identity services in a fast-paced, regulated environment.

Key Responsibilities Design and implement identity lifecycle workflows covering provisioning, de-provisioning, and orchestration Build secure, scalable RESTful APIs supporting identity, access, and governance use cases Integrate APIs with authentication and token services using OAuth2, OIDC, JWT, and federation standards Develop event-driven architectures using Pub/Sub to support asynchronous identity and access workflows Build cloud-native services using Cloud Run, Cloud Functions, GKE , or containerised workloads Implement Infrastructure as Code using Terraform for IAM, APIs, Pub/Sub topics, and permissions Support CI/CD pipelines, automated testing, and validation of IAM policies and API behaviour Troubleshoot identity, access, and API issues across distributed systems Collaborate with security teams on audits, compliance, and incident investigations Produce clear technical documentation and reusable components Required Experience Strong experience building identity-focused APIs and workflows Hands-on experience with identity orchestration platforms (e.g. Auth0 Actions, Okta Workflows, WorkOS, Slash

ID) Strong programming skills in Python, Go, Java, or Node.js Solid understanding of event-driven architectures , Pub/Sub, and message processing patterns Proven experience with cloud-native development on GCP Good knowledge of Terraform or equivalent IaC tooling

Experience with API gateways, service mesh, or reverse proxies Strong understanding of security-first design principles in enterprise environments Nice to Have

Experience with additional identity providers (Okta, Azure AD, Ping Identity) Exposure to Kubernetes (GKE, workload identity, RBAC)

Experience with secrets management tools (Vault, Secret Manager) Familiarity with compliance frameworks such as SOC2, ISO 27001, or PCI Why Apply? Contract through to year-end with extension potential Hybrid working from Sheffield Inside IR35 engagement Opportunity to work on large-scale identity and access platforms High-impact role within a major financial services transformation programme If you are an Application Developer with strong identity, API, and cloud experience looking for your next contract role, please apply or get in touch for more details.