Senior Engineer

My client are looking for a UK-based remote **Senior API Product Engineer**

• Outside IR35
• 5 months initially (good chance of extension)
• Remote

**Overview** You build and own APIs as products. You focus on outcomes, not tickets. You work hands-on across the full API lifecycle. You follow platform standards while contributing to shared tooling and patterns. This role suits someone who blends strong engineering with product ownership. **What you will do** **Design and build APIs** Design APIs aligned to agreed standards, including naming, versioning and security, work with domain data models, build REST and event-driven APIs, keep consistency across platform patterns **Use and improve platform tooling** Use shared CI/CD pipelines, templates and reference architectures

• Follow established patterns
• Improve and contribute reusable API assets

**Own the full API lifecycle**

• Design, build, test, deploy and operate APIs
• Manage versioning strategy
• Maintain backward compatibility

**Deliver integrations**

• Integrate with internal systems and data platforms
• Handle data transformation across services
• Apply synchronous and asynchronous patterns
• Build for resilience, including retries, timeouts and fallback

**Implement security**

• Apply authentication, including OAuth2 and client credentials
• Follow platform-led authorisation models
• Align with central identity approaches

**Enable observability**

• Implement logging, metrics and tracing
• Support monitoring through shared platform tools
• Ensure services remain observable and supportable

**Collaborate across teams**

• Work with QA, platform engineering and product stakeholders
• Contribute to engineering standards and governance forums
• Align with wider delivery and architecture direction

**Deliver in an agile environment**

• Ship iteratively under tight timelines
• Manage cross-team dependencies
• Balance speed with compliance to standards

**What you bring** **Technical experience**

• Strong API engineering across REST and event-driven systems
• Experience with cloud-native development, ideally Azure
• CI/CD and infrastructure as code awareness
• Strong understanding of integration patterns, sync and async
• Experience implementing OAuth2 security
• Familiarity with API management platforms

**Platform mindset**

• Comfortable working within guardrails
• Experience using shared tooling and frameworks
• Pragmatic approach to standardisation vs flexibility