Freelancer profile translated to English.
Back to original languageAbout Raphaël
Is your frontend team no longer **making progress**, is every release **breaking something**, and is it worse since they started using **AI**?
A poorly delivering team has a process problem, not a talent problem. I intervene on yourReact.js / Next.jscodebases tostabilizewhat's breaking,accelerateyour releases, and prepare your product to **scale**.
Here are the concrete results achieved for my clients:
- Maiia (React.js / Next.js): scratch creation of the platform and design system in atomic design (80+ components), switch of 70,000 healthcare professionals without interruption. Platform went from500,000 to 3.25 million usersduring COVID-19 vaccination.
- Billiv (React.js / Next.js): monorepo architecture with unified design system across 4 applications ->40% code deduplicationand app stabilization (0 regression in production) thanks to my **Cypress e2e tests**.
- Noticia (React.js / Next.js): full-stack monorepo architecture,4 web products delivered in 2 months(webapp, dashboard, admin) ->€500k funding round
You integrate me into your team and I amimmediately operational**: I develop your features in **React.js / Next.jswhile structuring what needs to be structured —design system**, **unit tests, integration tests, and E2E tests(Jest, Cypress, Playwright), **monorepo architecture**, **CI/CD**, DX. You gain a developer who delivers AND continuously improves the codebase.
Furthermore, your team will upskill with me: **Next.js coaching**, code reviews, implementation of **good testing practices**.
I work withstartupsandscale-upsthat have found their market but whose codebase is starting to **hinder growth**.
My typical missions: tired codebase audit, senior frontend developer reinforcement, design system architecture, monorepo implementation, E2E tests that hold up.
Have a project in mind? Write to me!
English
Fluent
French
Native or bilingual
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Bordeaux (up to 50km), Lille (up to 50km), Marseille (up to 50km)
Experience
- Groupe BarrièreFrontend Developer React.js | Next.js | Typescript | Design System | AIENTERTAINMENT AND LEISUREApril 2026 - Today (2 months)Paris 08 Élysée, France→ Mission Objective: Redesign the "Account" area of Groupe Barrière (user account and loyalty program management) by modernizing the UX/UI and establishing solid foundations fordesign systemand scalability of frontends using React.js & Next.js.→ Achievements:
- In-depth audit of the existing design system: analysis of UI inconsistencies, industrialization limitations, and UX impacts, with definition of concrete recommendations for a scalable redesign across the Barrière ecosystem.
- Redesign of the Account area (user account, loyalty, benefits) in React / Next.js leveraging design system principles to improve UI consistency, user flow fluidity, and perceived quality.
- Implementation of unit and non-regression tests with Jest to secure UI components, ensure reliable evolution, and guarantee the stability of critical account and loyalty-related user journeys.
→ Technical Stack: React.js · Next.js · Jest · Design System (audit & structuring) · Playwright · Storyblok (headless CMS for content contribution by marketing) · Storybook - BillivFrontend Developer React.js | Next.js | Typescript | E2E Tests | Design System | AISOFTWARE PUBLISHINGDecember 2022 - June 2024 (1 year and 6 months)Paris, France→ Mission Objective: Redesign the frontend architecture of an omnichannel SaaS platform to accelerate releases, ensure reliable deployments, and harmonize the product experience across 4 React.js / Next.js applications.→ Achievements:
- Migration of 4 applications to a Turborepo monorepo with GitHub Actions CI/CD and a feature branch system, reducing time-to-release to less than 1 week and improving development velocity by +30%.
- Design of a shared design system with shadcn/ui, Tailwind CSS, and Storybook, enhancing UI/UX consistency, perceived quality, and frontend maintainability across all SaaS products.
- Implementation of Cypress e2e tests, Jest / Testing Library integration tests, and strict ESLint / Prettier rules, reducing production bugs by 50% while maintaining an NPS > 70.
→ Technical Stack:Next.js · React.js · TypeScript · Turborepo · shadcn/ui · Tailwind CSS · Storybook · Cypress · Jest · Testing Library · GitHub Actions · ESLint · Prettier - MaiiaFrontend Developer React.js | Next.js | Typescript | E2E Tests | Design System | AIMEDICALApril 2019 - July 2022 (3 years and 3 months)Paris, France→ Mission Objective: Redesign the appointment booking and teleconsultation platform of a health startup, then ensure its scaling during the COVID crisis with a robust, high-performance, and uninterrupted frontend.→ Achievements:
- Design of a design system in Atomic Design (80+ React components documented via Storybook) to accelerate development, standardize UX, and improve perceived quality.
- 0-downtime migration of 70,000 healthcare professionals to React / Next.js, with Core Web Vitals optimization, technical SEO, and scalable architecture to handle 6x load without critical incidents.
- Development of critical features: B2B white-label appointment booking, COVID vaccination waiting list, Vital card scanning, insurance integration, advanced search, and Cypress E2E testing strategy ensuring 0 regression in production.
→ Technical Stack: React.js · Next.js · TypeScript · Redux · React Query · Storybook · Cypress · Material UI · react-hook-form · SEO
Reviews
Recommendations
+1
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Education
- DIGITAL TECHNOLOGY ARCHITECT42La pédagogie unique de l'école 42 m'a permis d'apprendre à faire face à n'importe quelle situation ou problème de façon calme et autonome. J'y ai également appris à travailler en équipe, à faire de la veille technologique et à communiquer efficacement avec des clients.
Certifications
- TDD & Clean Architecture in the Web world with React/Typescript/ReduxWealcome2025