Senior API Developer

Contract - Senior API Developer (Microsoft & Cloudflare)Your new companyYou'll be joining a major public sector program in Central Sydney, contributing to a large transformation effort that depends on well-designed, secure, and clearly documented APIs.
Your new roleAs the Senior API Engineer, you'll lead the creation of REST-based interfaces that external teams will use to build consistent integrations. You'll shape resource models, define endpoint behaviour, and establish standards for versioning, error handling, pagination, and data structures.You'll produce high-quality OpenAPI specifications, technical guides, authentication instructions, and sample payloads, along with Postman collections to support smooth developer onboarding. You'll also build Cloudflare-hosted mock and sandbox environments, including validation logic, authentication stubs, and predictable test data.Security and reliability patterns will be part of your remit, including documenting access controls, encryption expectations, logging structures, and Cloudflare configurations.
What you'll need to succeed

• 5-8+ years designing REST APIs using contract-first principles.
• Strong capability with OpenAPI/Swagger, JSON Schema, and related tooling.
• Hands-on experience with Cloudflare Workers and at least one Cloudflare security or gateway component.
• Solid understanding of OAuth2, OIDC, JWT, HTTP behaviours, caching, and rate-limiting.
• Proven ability to produce clear technical documentation, mock servers, and Postman assets.
• Familiarity with CI/CD pipelines, Git workflows, and automated documentation processes.
• Understanding of security and governance requirements in regulated or public sector environments.
• Excellent written communication skills.

What you'll get in returnYou'll influence API standards across a major public sector program, work with modern tooling, and take ownership of key integration assets in a structured, well-supported environment.

If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
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