Full-time

Senior Python API Developer

Posted by Cavendish Professionals • Helsinki, Uusimaa, Finland

📍 Helsinki, Uusimaa 🕒 March 02, 2026

About the Role

Our client is seeking a passionate and innovative Senior API Engineer
Required Qualifications:
Strong proficiency with Python and FastAPI framework (routing, dependency injection, middleware, async/await programming).
Deep understanding of RESTful API design, architecture, versioning, HTTP protocols, Pydantic validation, and Pytest.
Experience with OIDC / OAuth 2.0, and integrating third-party APIs.
Knowledge of distributed systems, inter-service communication, API gateways, and load balancing.
AWS familiarity — ECS, ECR, CloudWatch, Secrets Manager, ElastiCache, DynamoDB.
Understanding of CI/CD pipelines, horizontal scaling, and fault tolerance.
Exceptional analytical and problem-solving abilities, with a meticulous attention to detail and a proven capacity to diagnose and resolve complex issues under pressure.
Excellent written and verbal communication skills in English, with the ability to articulate complex technical concepts to both technical and non-tec...

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