About William
Senior Freelance Développeur principalement pour des agences, studios et startups sur du développement frontend et backend afin de créer des expériences digitales immersives, SAAS, prototypes & POC.
J’ai travaillé pour des clients en France mais aussi pour des clients internationaux comme TotalEnergies, Dassault, l'Argus, Leboncoin, Adevinta, Frichti ,Publicis, Ubisoft, Airbus, Whaou!, Novotel, Volkswagen, Veolia, Virgin mobile, Dalma, Chance, Ekino, BETC..
Mon travail a été récompensé à plusieurs reprises sur Awwwards, FWA, WEBBY awards .
🚀 Technologies maîtrisées
Typescript, Ecma/Javascript
React, Next.js, TailwindCSS, Redux, Zustand, Tanstack Query
Node.js, Nest.js, Express.js, Koa, GraphQL/REST, PostgreSQL, MongoDB
React Testing Library, Cypress.io, Jest, Vitest
Figma, Storybook, Atomic Design
• Website : thenextunicorn.xyz
• Mail : william.holcman at gmail.com
• Linkedin : linkedin.com/in/wholcman/
• Twitter : twitter.com/wholcman/
English
Conversational
French
Native or bilingual
Can work on-site
Paris (up to 50km), Paris (up to 10km)
Experience
- Freelance SASUSenior freelance developerENTERTAINMENT AND LEISUREJanuary 2010 - Today (16 years and 5 months)Paris, FranceSenior developer react.js/nodejs freelance paris depuis 2010.Clients:TotalEnergies, Adevinta, Leboncoin, Frichti, Chance, Dalma, Ubisoft, Publicis, Blkout, Merci-Michel, Whaou!, Novotel, Veolia, Airbus, Milka, Volkswagen, Virgin Mobile, Burger King, Fnatic, StarWars, Arte...Awards:Mon travail a été récompensé à plusieurs reprises sur FWA, Awwwards, CSSDA par des professionnels.
- TotalEnergiesSenior Fullstack EngineerNovember 2022 - Today (3 years and 7 months)Designed and developed a custom Developer Portal exposing hundreds of secured APIsBuilt front-end architecture using React.js and Next.jsIntegrated REST APIs and collaborated closely with backend and DevOps teamsImplemented CI/CD pipelines with Docker, Kubernetes, and GitHub ActionsDeveloped end-to-end tests using CypressDefined front-end standards and development guidelinesTech Stack: React, Next.js, TypeScript, Node.js, React Query, Docker, Kubernetes, Cypress, GitHub Actions
- AdevintaSenior Frontend Engineer - React.JSAugust 2021 - November 2022 (1 year and 3 months)Migrated legacy Oracle-based systems to React and Next.jsBuilt internal back-office tools used to manage thousands of vehiclesImplemented shared front-end libraries distributed via TSDXAchieved 100% unit test coverageParticipated in technical recruitment and mentoringModernized the front-end stack to align with Leboncoin standardsTech Stack: React, Next.js, TypeScript, Material-UI, React Query, Go
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Education
- BAC + 2 - DUT InformatiqueIUT de Vélizy-Rambouillet2012
- BAC +5 - Expert en ingénierie et de la communication numériqueHETIC2014