Freelancer profile translated to English.

Description

Senior Freelance Developerprimarily for agencies, studios, and startups onfrontendandbackenddevelopment to create immersive digital experiences, SAAS, prototypes & POC.

I have worked for clients in France as well as international clients such as TotalEnergies, Dassault, l'Argus, Leboncoin, Adevinta, Frichti, Publicis, Ubisoft, Airbus, Whaou!, Novotel, Volkswagen, Veolia, Virgin mobile, Dalma, Chance, Ekino, BETC..

My work has been awarded several times on Awwwards, FWA, WEBBY awards.

🚀 Technologies mastered

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/

Industry field of expertise

Languages

English
Conversational
French
Native or bilingual

Workplace preferences

Can work on-site

Paris (up to 50km), Paris (up to 10km)

Freelance SASU
Senior freelance developer
ENTERTAINMENT AND LEISURE
January 2010 - Today (16 years and 5 months)
Paris, France
Senior react.js/nodejs freelance developer in Paris since 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:
My work has been recognized multiple times by professionals on FWA, Awwwards, CSSDA.
React.js Node.js Websocket Docker Kubernetes
TotalEnergies
Senior Fullstack Engineer
November 2022 - Today (3 years and 7 months)
Designed and developed a custom Developer Portal exposing hundreds of secured APIs
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

Tech Stack: React, Next.js, TypeScript, Node.js, React Query, Docker, Kubernetes, Cypress, GitHub Actions
Typescript Kubernetes Cypress Docker Next.js
Adevinta
Senior Frontend Engineer - React.JS
August 2021 - November 2022 (1 year and 3 months)
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

Tech Stack: React, Next.js, TypeScript, Material-UI, React Query, Go
Next.js Typescript React.js

Check out William's experience

Carole

Leboncoin France

Reviewed on 4/30/2020

William adapted very quickly to our constraints, our processes, and our team spirit. He is proactive, whether functionally or technically. He also shares his business perspective while respecting the company's choices. Thanks to William's efficiency, we were able to complete our project even faster (and better!) than we had planned. Thank you very much William!

Carole

Leboncoin France

Reviewed on 3/16/2020

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

Baptiste Duhen

Fullstack developer

4.6

(4)

Amed Hamou

Senior Lead Developer

(2)

Audrey Champion

Web developer

4.3

(3)

Signup to reveal

BAC + 2 - DUT Computer Science
IUT de Vélizy-Rambouillet
2012
BAC +5 - Expert in digital engineering and communication
HETIC
2014

William Holcman

Senior full-stack developer - React & Node.js

About William

Experience

Reviews

5.0

Quality

5.0

Deadline

5.0

Communication

5.0

Carole

Carole

Recommendations

These freelancer profiles also match your criteria

Education

Skill set

Categories