API Developer
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Key Responsibilities
• Analyze the existing API and its documentation, and agree on the subset to cover.
• Analyze the ODS database and map its metadata to what the existing API exposes, identifying any gaps.
• Propose and implement a security approach (authentication, authorization, secure handling of submitted data), highlighting where it differs from the current API.
• Implement the metadata endpoints on top of the ODS database.
• Implement the submission endpoints, with validation of submitted data and meaningful error responses.
• Hand over submitted data to the ODS loading code (or store it in the form that code expects).
• Write automated tests and concise technical documentation.
• Deploy and demonstrate the solution on Ubuntu Linux.
• Report on limitations, open questions, and recommended next steps. Required
Skills:
• Python 3.12+ with FastAPI.
• SQLAlchemy and PostgreSQL (reading and mapping an existing schema).
• REST API design.
• API security: authentication and authorization (e.g. OAuth2/OIDC, JWT, API keys), TLS, input validation.
• Automated testing (pytest). Nice to Have:
• Polars in combination with SQLAlchemy.
• uv for package management.
• Experience with API compatibility or migration projects.
• Experience handling sensitive data (e.g. health data) and GDPR requirements.
• Linux deployment experience. Soft
Skills:
• Autonomy and ability to work from incomplete documentation.
• Pragmatism: focusing on the critical parts first while keeping quality high on what is delivered.
• Clear communication of findings and limitations. At Keystone Solutions, we pride ourselves on our consultancy nature, offering dynamic projects that provide turbo-charged learning opportunities. As a If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal. Duration: 26/10/2026
- 31/12/2026 3 months
• (full time) Skills required:
• API
- Level: Expert
- Most recent: Any time
• API Design
- Level: Expert
- Most recent: Any time
• API Developer experience (SOAP en REST)
- Level: Expert
- Most recent: Any time
• API development (FastAPI,...)
- Level: Expert
- Most recent: Any time
• API Security a.d.h.v. OAuth en WS-Security
- Level: Expert
- Most recent: Any time
• PostgreSQL
- Level: Expert
- Most recent: Any time
• Pytest
- Level: Expert
- Most recent: Any time
• Python
- Level: Expert
- Most recent: Any time
• REST
- Level: Expert
- Most recent: Any time
• SQLAlchemy
- Level: Expert
- Most recent: Any time Language
requirements:
Dutch Level Passive knowledge English Level Active knowledge French Level Passive knowledge
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