Olivier Foucher

🏢 FDJ United 📅 Sept. 2024 – Present 🧩 Stack: TypeScript, React, Styled-components, Mitt, REST APIs, Jest, GitLab CI/CD, GitLab Duo, Git 🏪 SCoTT — In-store terminal app for lottery retailers, 30,000+ terminals across France (draw games, sports betting, scratch cards) • Owned features end to end: design, implementation, tests, acceptance criteria and validation, with proposals reviewed against the target architecture • Contributed to ~15 front-end modules, shared component libraries (UI components, events, etc.) and the container application they run on • Advised junior developers as functional/technical expert on the draw and sports scope, via code reviews, pair programming and documentation • Worked with tech leads and architects to scope the software's next application areas (technical and visual) and macro-estimate them ahead of PI Planning • Initiated the team's AI tooling for GitLab Duo: an AGENTS.md capturing the modular-monolith architecture, code conventions and module dependencies, plus skills targeting specific tasks --- 🏢 RATP Group 📅 Feb. 2023 – Sept. 2024 🧩 Stack: TypeScript, React, NestJS / Express, PostgreSQL, Vitest / Jest, AWS S3, Datadog, SonarCloud 🛠 Iziday – Internal tool for managers & field operators • Shipped product from scratch to production in 4 months, as one of 3 engineers • Cut query response time on high-load endpoints by optimizing complex PostgreSQL joins • Reduced technical debt on legacy modules, improving test coverage and maintainability 🧾 Harmoney – Accounting & financial management platform • Built 10+ front-office journeys end to end: REST endpoints in Node.js/Express over PostgreSQL, React interfaces, and links to 8 business reference systems • Reduced query execution time by 2x-3x on the heaviest endpoints, profiling with Datadog, adding indexes and refactoring SQL • Wrote 8+ cron batch jobs exchanging business data with third-party systems, handling CSV files stored on AWS S3