API Developer Cover Letter Template

Dear Hiring Manager, I can see how API design and clear documentation keep teams moving, not just the code itself. In my last role I helped shape an API layer across multiple products, focusing on a solid REST and GraphQL mix. We reduced onboarding time for new developers by more than 20 percent and introduced a streamlined versioning scheme that kept clients aligned without breaking changes. I’m keen to bring that practical approach to [Company Name]. I’m comfortable with design, security, and tooling that support reliable APIs. I’ve implemented authentication schemes, token refresh flows, and rate limiting, plus comprehensive API documentation that teams can actually use day to day. I’ve worked with OpenAPI, GraphQL schemas, and automated tests to ensure contracts stay consistent as features evolve. I’m interested in opportunities at [Company Name] to contribute to robust APIs that teams trust. There was a project where we needed to merge two legacy services into a single, coherent API surface. I led the effort to define a common contract, implement auth across services, and establish versioned endpoints. We cut release risk with feature flags and a clear deprecation path, and the team managed to avoid downtime during migration. The experience reinforced the value of pragmatic design and clear communication with stakeholders. I’m available for a discussion about how my background fits the API Developer role at [Company Name]. If you’d like to chat, I can share concrete examples and timelines from my recent work. Kind regards, [Your Name]