Senior API Engineer

Queen Square Recruitment is working with a global IT partner and seeking a Senior API Engineer.

The Candidate must design, develop, and maintain secure and scalable APIs and microservices.

Refactor existing APIs to improve performance and developer experience

Automate testing (unit, contract, integration) using pytest, JUnit, Go testing, Postman / Newman

Implement CI / CD pipelines (GitHub Actions, Jenkins, GitLab CI)

Deploy on Kubernetes and monitor using OpenTelemetry, Prometheus, Grafana

Collaborate with Frontend, DevOps, and Product teams

Participate in code reviews and maintain documentation (Markdown, Swagger-UI )

Tech & Tools

Languages : Python, Java, Go

Testing : pytest, JUnit, Go testing, Postman / Newman

CI / CD : GitHub Actions, Jenkins, GitLab CI

Monitoring : OpenTelemetry, Prometheus, Grafana

Databases : PostgreSQL, Redis, MongoDB

Security : JWT, mTLS

Other : REST, semantic versioning, API design

Essential Requirements

5+ years of experience developing production APIs and microservices

Proficiency in at least two of the following languages : Python, Java, Go

Strong understanding of HTTP, REST, API security, and software architecture

Experience with relational and NoSQL databases

Solid testing practices and high code coverage

Bachelor's degree in Computer Science or equivalent experience

English proficiency (B2 / C1 Level)

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