Freelancer profile translated to English.

Description

Need robust, secure, and production-ready APIs?

Specializing in the Python / FastAPI ecosystem and GCP Cloud, I support technical and product teams from the scoping phase through to deployment and operation.

My approach goes beyond simple development: I build complete, secure, and observable systems designed to be maintainable and scalable.

🎯 WHAT I BRING TO YOU:

✅ API First Architecture & Design

Technical scoping, requirements gathering, and RFC/ADR writing.

Strict OpenAPI contracts (Contract First) design.

Advanced Patterns: Idempotence, Pagination, Versioning.

✅ Development & Industrialization

High-performance Backend development in FastAPI (Python 3).

Uncompromising software quality: Tests (Pytest Unit/Int), SonarQube, SAST/SCA.

Complete GitLab CI/CD: from Merge Request to automated deployment.

Optimized Docker packaging.

✅ Advanced Security (IAM)

Identity and Access Management: OAuth2, OIDC, RBAC.

CIAM Integration: Keycloak, Auth0, Okta.

Management via Apigee: Security, Quotas, Rate-limiting, Cache.

Secrets management and sensitive data masking.

✅ Ops & Observability

Secure production deployment (Dev/UAT/Prod) with Rollbacks.

Comprehensive monitoring: OpenTelemetry, structured logs, tracing.

SLI/SLO definition and tracking.

💻 TECHNICAL STACK:

Languages & Frameworks: Python 3, FastAPI, Pytest, React (notions).

API & Security: REST, OpenAPI, Apigee, OAuth2/OIDC, Keycloak/Okta/Auth0.

Cloud & Data: GCP (BigQuery, Firestore, IAM, Run), MongoDB Atlas.

DevOps & Tools: Docker, GitLab CI/CD, SonarQube, OpenTelemetry, SFTP.

🚀 Ready to structure and scale your backend? Let's discuss your project.

Industry field of expertise

Languages

French
Native or bilingual
English
Native or bilingual

Workplace preferences

Can work on-site

Paris (up to 50km)

VEOLIA
Backend Developer
January 2020 - December 2025 (5 years and 11 months)
Scoping & API Contracts: Requirements gathering, OpenAPI design, ADR/RFC, technical choices.

Architecture & Implementation: Patterns (idempotence, pagination, versioning), FastAPI, Docker packaging.

Security & Access: OAuth2/OIDC, RBAC, CIAM (Keycloak/Okta/Auth0), Apigee (auth, quotas/rate-limit, cache), impersonation support.

Quality & Industrialization: Pytest tests (unit/int), GitLab Issue Board & MRs (templates/approvals), CI/CD, SonarQube, SAST/SCA, container scanning.

Production Deployment & Operation: dev/uat/prod deployments, SLI/SLO, structured logs, alerting/traces (OpenTelemetry), runbooks & safe rollbacks.

Concrete Examples (A to Z)

Query Engine (platform product): Multi-source JSON data generator (APIs, BigQuery, Power BI, Google Calendar...) that directly feeds React components without developing APIs. Configuration UI for teams, multi-CIAM, impersonation for support, quotas/observability, industrialized deployment.

Customer Portal — Backend API: FastAPI from scratch, OpenAPI contracts, tests, OIDC/RBAC security, exposed via Apigee (quotas/rate-limit, cache), usage observability.

Multi-BU Data Hub: Data centralization, controlled SFTP ingestion, usage logs for re-invoicing, user credits (trial phases), BigQuery/Firestore/MongoDB Atlas storage.

Chatbot React × LumApps: From scratch and integrated into the intranet; secure LLM via backend proxy (no keys in the front), quotas/rate-limit, minimal logging, secrets managed by the LumApps connector.

Stack

Python 3, FastAPI, Pytest, REST/OpenAPI • Apigee • Keycloak / Okta / Auth0 • GCP (BigQuery, Firestore, IAM, Secret Manager, Logging/Monitoring) • MongoDB Atlas • Docker • GitLab (Issue Board, MRs, CI/CD, releases) • SonarQube • SFTP • React • LumApps • Power BI, AppSheet, Google Apps Script • OpenTelemetry.
Python Gitlab CI/CD SonarQube Google Cloud React Native
Banque de France
Backend Engineer & API Architect
PUBLIC SECTOR
January 2018 - January 2020 (2 years)
Context: Within the IT department, I worked on modernizing tools for the Financial Control and Supervision departments. I designed and industrialized critical API architectures for the secure aggregation and analysis of banking and regulatory data.

Major Achievements:

📊 Tools for Management Control & Supervision

Query Engine Design: Developed a solution enabling controllers and auditors to cross-reference heterogeneous financial data (BigQuery, business APIs) through a unified interface, without complex technical manipulation.

Multi-source Data Aggregation: Centralized flows for financial reporting, ensuring data consistency across different environments (internal and partner systems).

🔐 Banking Security & Access Management (IAM)

Sensitive Data Security: Implemented strict protocols (OAuth2 / OIDC) to ensure the confidentiality of financial information.

Traceability & Audit: Set up detailed and tamper-proof usage logs via Apigee and OpenTelemetry, essential for compliance audits and internal re-invoicing.

Fine-grained Access Control (RBAC): Segregated data access based on profiles (Auditors, Controllers, IT).

⚙️ "Bank-Grade" API Architecture & Industrialization

OpenAPI Design & Interface Contracts: Standardized data exchange between banking entities.

High Availability: Resilient architecture (FastAPI, Docker, GCP) with quota and rate-limiting management to protect core-banking systems.

Code Quality & Compliance: Strict GitLab CI/CD pipeline (SonarQube, SAST) meeting the quality requirements of the banking sector.

Technical Environment:

Core: Python 3, FastAPI, Pytest.
Security: Apigee, Keycloak, OAuth2/OIDC (FAPI Standard).
Financial Data: BigQuery, Firestore, secure SFTP.
Ops: GitLab CI, Docker, OpenTelemetry.
Python Gitlab CI/CD Gitlab Java