We are seeking a Senior API Engineer who will design, develop, and maintain robust, well-tested APIs that enable customers and partners to integrate quickly and securely with our systems.

• Build microservices and SDKs in Python, Java, or Go as required by each domain.
• Refactor existing APIs to improve performance, maintainability, and developer experience (DX).
• Automate unit, contract, and integration tests (pytest, JUnit, Go testing, Postman/Newman).
• Implement CI/CD pipelines (GitHub Actions, Jenkins, GitLab CI) and deployments on Kubernetes.
• Instrument logs, metrics, and distributed traces (OpenTelemetry, Prometheus, Grafana).
• Take part in code reviews, standards definition, and documentation (Markdown, Swagger-UI).
• Collaborate closely with Frontend, DevOps, and Product Managers to deliver continuous business value.

• Flexible Remote Work
• B2B contract
• Possibility of using a coworking space in Cracow (with access to prosecco from a tap and a billiard table ;))
• Private medical care package and Multisport card
• Quarterly integration events
• Positive atmosphere created by our super team - open-minded, eager to help people who are truly committed to what they do and who build relationships based on mutual respect and good humor

• 5+ years developing production APIs and microservices.
• Hands-on experience in at least two of these languages: Python, Java, Go.
• Strong understanding of HTTP, REST, semantic versioning, error handling, and security (JWT, mTLS).
• Solid experience with relational and NoSQL databases (PostgreSQL, Redis, MongoDB).
• Proven track record of automated testing and high code coverage.

• Quality mindset and continuous-improvement orientation.
• Excellent debugging and troubleshooting skills.
• Teamwork and DevOps mentality.