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Julien Seren-RossoJS

Julien Seren-Rosso

Supermalter

Fullstack Web Developer

€600/day
5 projects
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Julien

Web developer for 10 years, I first started my career by creating mobile applications for iOS. First in Objective-C then with Swift, I quickly joined the web domain for its accessibility and the ease of creating interfaces available to everyone.

With a strong interest in product issues and accessibility, I am also very comfortable with teamwork and I collaborate easily with designers and UX experts.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • Trackdéchets
    Front-end Developer
    June 2022 - Today (4 years)
    Trackdéchets is a regulatory platform, developed by the Ministry of Ecological Transition. This platform aims to dematerialize the traceability of hazardous waste to simplify management and secure supply chains.

    I was responsible for the redesign of the platform with the State Design System (DSFR) and the implementation of many other features.
    Typescript React.js GraphQL DSFR Product Development
  • Renault
    3D Expert - Sketchfab Integrator
    AUTOMOBILE
    November 2021 - December 2021 (1 month)
    Paris, France
    Assistance with Sketchfab integration on The Original Museum platform https://theoriginals.renault.com/
    Configuration and optimization of 3D models via the Sketchfab editor
    3D Rendering Sketchfab Integration
  • Self Employed
    Freelance frontend (React / Vue) and mobile developer
    July 2019 - Today (6 years and 11 months)
    Paris, France
    Frontend : I can work with most modern frameworks to meticulously craft beautiful interfaces. UI and UX are a specific focus of my work. React / vuejs 3D expertise for Sketchfab projects, I help configure models to achieve the best results the platform can offer. Mobile : can help on React Native projects or Swift ones for iOS.

Reviews

5.0

Out of 1 rating

E

Emmanuel

Trackdéchets

Reviewed on 10/22/2025

A big thank you to Julien for his commitment in the implementation of the dematerialization of hazardous waste traceability and in the integration of the National Register functionalities, nationwide, from December 2022 to the present day. His commitment has led to wide recognition by industry players and has contributed to making Trackdéchets an innovative public project, emblematic of "State unicorns". As a Frontend Developer, Julien played a key role in the continuous optimization and improvement of the product's user interface. Mastering best practices in accessibility, performance, and responsive design, he actively contributed to the functional evolution of the product. It is a pleasure to work with Julien, who carried out his mission with great seriousness and is often a source of proposals for improvements to be made during various workshops.

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Education

  • Information Systems Manager, Information Systems
    Exia.Cesi
    2012
    Manager des Systèmes d'Information, Systèmes d'information
  • Bac S - High Honors - European English
    Notre-Dame Saint-Sigisbert
    2007
    Bac S - Mention Bien - Européen Anglais

Skill set

Categories