Senior Engineer
Posted 5 days ago by Haystack
Negotiable
Outside
Remote
United Kingdom
Summary: The role of Senior API Product Engineer involves building and owning APIs as products, focusing on outcomes throughout the API lifecycle. The position requires a blend of strong engineering skills and product ownership, with responsibilities including designing, building, and integrating APIs while ensuring security and observability. The role is remote and outside IR35, initially for a duration of five months with a possibility of extension.
Key Responsibilities:
- Design and build APIs aligned to agreed standards, including naming, versioning, and security.
- Use and improve platform tooling, including shared CI/CD pipelines and reference architectures.
- Own the full API lifecycle: design, build, test, deploy, and operate APIs.
- Deliver integrations with internal systems and data platforms, handling data transformation.
- Implement security measures, including OAuth2 and client credentials.
- Enable observability through logging, metrics, and tracing.
- Collaborate across teams, contributing to engineering standards and governance forums.
- Deliver in an agile environment, managing cross-team dependencies and balancing speed with compliance.
Key Skills:
- Strong API engineering experience across REST and event-driven systems.
- Experience with cloud-native development, ideally in Azure.
- CI/CD and infrastructure as code awareness.
- Strong understanding of integration patterns, both synchronous and asynchronous.
- Experience implementing OAuth2 security.
- Familiarity with API management platforms.
- Comfortable working within guardrails and using shared tooling and frameworks.
- Pragmatic approach to standardisation versus flexibility.
Salary (Rate): undetermined
City: undetermined
Country: United Kingdom
Working Arrangements: remote
IR35 Status: outside IR35
Seniority Level: Senior
Industry: IT
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