API Developer

Il y a 3 jours

Brussel, Brussel-Hoofdstad, Belgique Keystone Solutions Télétravail Temps plein 70 000 € - 110 000 €/an

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Mission Overview

We are seeking an API Developer for a consultancy mission at a client site, representing Keystone Solutions. The objective is to re-implement a subset of a third‑party API to ensure a smooth transition for current users. This role involves working on a straightforward API with two main functional parts: a metadata layer and a submission layer.

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.

Duration

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

API Developer

Enregistrez cette offre et organisez votre recherche

Mission Overview

Key Responsibilities

Required Skills

Nice to Have

Soft Skills

Duration

Skills required

Language requirements

Emplois similaires à Brussel

Villes principales

Amériques

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API Developer

Enregistrez cette offre et organisez votre recherche

Mission Overview

Key Responsibilities

Required Skills

Nice to Have

Soft Skills

Duration

Skills required

Language requirements

Emplois similaires à Brussel

Villes principales