William Holcman

I help entrepreneurs, startups, agencies and studios craft amazing user experiences in France, UK, US. Worked on "long term" missions with clients such as Adevinta, Frichti, Leboncoin, TotalEnergies, Chance, Argus. Worked on "short term" missions with clients such as Dalma, Yomoni, Dassault, Volkswagen, Ubisoft, Novotel, Whaou!, Havas, Publicis, DDB, Ekino, BETC, Airbus, Virgin Mobile, Merci-Michel..

* Designed and developed a custom centralized Developer Platform exposing hundreds of secured APIs for the entire TotalEnergies Group. * Strong expertise of Azure APIM, AWS API Gateway, Apigee Hybrid * Built front-end architecture using React.js and Next.js * Integrated REST APIs and collaborated closely with backend and DevOps teams * Implemented CI/CD pipelines with Docker, Kubernetes, and GitHub Actions * Developed end-to-end tests using Cypress * Defined front-end standards and development guidelines

* Migrated legacy Oracle-based systems to React and Next.js * Built internal back-office tools used to manage thousands of vehicles * Implemented shared front-end libraries distributed via TSDX * Achieved 100% unit test coverage * Participated in technical recruitment and mentoring * Modernized the front-end stack to align with Leboncoin standards

* Built acquisition funnels and SEO-optimized landing pages * Developed animated UI using Framer Motion * Implemented performance tracking tools * Participated in front-end recruitment

* Migration from Vuejs to React.js of the entire new messaging with only the Lead Frontend of Leboncoin. * Apply and challenge the standards of the Frontend guilde of Leboncoin.

FWA - showcasing innovation every day since 2000 FWA's mission is to showcase cutting edge creativity, regardless of the medium or technology used.

Merci-Michel is a award-winning digital production house composed of digital craftsmanship experts. By blending storytelling, technology and the love of a job well done, we create remarkable interactive experiences.

Firstborn is a well-known creative agency based in New York City. Craft matters. We shape modern brands for a connected future.

FCINQ is a creative studio. What originally started out as a team of graphic designers, animators and developers is today a team of thirty people whose roles range from strategy developers to brand content and UX Design. Whatever the format may be, their focus is to provide the best quality service for creating experiences and brand worlds that convey emotion, feeling and that make communication a successful exchange with the final user.