Jérôme Derboven

Senior Frontend Engineer (Freelance)

RIM

• Fullstack development on the media monorepo: HonoJS + GraphQL microservices on the backend, Next.js and Astro apps on the frontend, all in React 19 and TypeScript with shared library management via NX.
• Built the multi-brand editorial component library powering the group's newspapers.
• Introduced a Component Registry Pattern to fix circular dependencies across NX libraries. Unblocked three frontend squads working in parallel and got Astro builds running in CI.
• Design-token pipeline (Tokens Studio → Git → Panda CSS presets): updates went from days to minutes, no more manual Figma handoffs.
• Daily use of Claude Code and Codex CLI for refactoring, codemods, and documentation.

Senior Software Engineer

Vertuoza

• Worked on the rebuild of Vertuoza, a SaaS platform for construction quotes and profitability tracking. Owned the invoice customization UI and profitability dashboards (React, Recharts, Tailwind).
• Co-designed GraphQL contracts with the backend team, shipping features end-to-end against a NestJS API.
• Set up Storybook and Jest conventions that the rest of the frontend team adopted.

Senior Frontend Developer

Herontrack

• Took over a fragile tool-tracking platform used by construction site managers and rebuilt it as an Angular + NX monorepo with NgRx, Jest, Cypress, and Storybook.
• Built a Fastify + tRPC service layer that consolidated multiple tag data feeds into one typed API.
• Mentored two junior frontend developers — RxJS patterns, state management, testing strategy.

Lead Senior Frontend Developer

Altissia

• Led the rebuild of a multi-tenant language-learning platform. Consolidated several legacy Angular repos into an NX monorepo organized by domain, giving each Scrum team clear ownership.
• Designed the multi-theme architecture that lets a single codebase serve 10+ white-label clients.
• Introduced NgRx for state management, Cypress for E2E, and Jest for unit tests.

Java / fullstack engineer

Knoware / Pixelixir

Early engineering roles for Knoware clients (Isabel, SWIFT, ONE, Pfizer, BNP Paribas Fortis) and at Pixelixir.

• Java and fullstack development for banking, public sector, pharma, and e-commerce clients.