You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Kevin NguyenKN

Kevin Nguyen

Senior Frontend Engineer

€683/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Kevin

Frontend developer 🧑‍💻 for over 10 years, I've built a rather atypical profile: I started my career in virtual reality 🕶️ developing professional training simulators, before refocusing on the React / Next.js / TypeScript ⚛️ ecosystem where I found my main playground.

What I love about my job is both solving complex technical problems and contributing to growing a team. In my last 3-year mission at Upply, I naturally took on a technical lead and deputy lead role, not because I was asked to, but because that's how I operate ⚡️.

Specifically, I work on frontend architecture, performance, code quality, and technical debt reduction. I like to implement practices that last: design systems, testing strategies, code conventions, and not just delivering features 🚀.

If you're looking for someone who integrates quickly, takes ownership independently, and is truly involved in the technical life of your product, we probably have things to discuss.

Available immediately, remote or hybrid Paris.
  • French

    Native or bilingual

  • English

    Native or bilingual

  • Spanish

    Basic

  • Japanese

    Basic

Can work on-site
Paris (up to 10km)

Experience

  • Upply
    Senior Frontend Engineer - Deputy Lead
    TRANSPORTATION
    November 2022 - February 2026 (3 years and 3 months)
    Levallois-Perret, France
    Scale-up Supply Chain · ~50 people · Tech team ~20
    Nov. 2022 – June 2024 via L'Atelier (Consulting Firm) · June 2024 – Feb. 2026 as direct freelance

    First phase (Nov. 2022 → Apr. 2023): mission within the Geodis Freight Forwarding team, managed by Upply.

    Role

    • Frontend technical lead,deputy lead(full responsibility in their absence).
    *+25% team velocity(Jira metrics) for a team of 6 frontend developers.
    • Participation in architecture decisions, code conventions, library choices.
    • Collaboration with Product / Design / Backend / Mobile.

    Architecture & Engineering

    • Back-office migrationCRA → Next.js
    *RSC(prefetching, hydrating, streaming)
    • **Optimistic updates**, query states (nuqs), code splitting
    • Custom hook for version conflicts on GraphQL mutations
    *WebSocketsfor GraphQL subscriptions (notifications, asynchronous tasks)
    • Replaced charting library withRecharts(significant performance gain)

    Quality & Culture


    *Storybookat my initiative (internal design system)
    • E2E strategyPlaywright**, aiming for 80% coverage, **parallelizedCI
    *CSPforSOC2accreditation

    *40% technical ticketsper sprint (technical debt), DORA KPIs maintained
    • Weekly knowledge sharing sessions on TypeScript / React / Next.js

    Product Impact

    • Fast integration, **immediate impact on velocity**.
    • Design and redesign of **3 major features**, including 1 critical one (core product).
    • Development of **Atlas**, internal AI chat assistant (Dust) connected to business data (transport, market insights).
    • **Skeleton loaders**, improved performance perception.
    • Mentoring juniors, pair programming, supervision of AI adoption (Cursor, Copilot)
    Typescript React / Next.js GraphQL Playwright Storybook
  • L'Atelier
    Experienced Consultant
    DIGITAL AND IT
    November 2022 - June 2024 (1 year and 7 months)
    Paris, France
    Frontend Consultant at the consulting firm L'Atelier, exclusively on assignment at Upply from November 2022 to June 2024, before continuing the same assignment directly as a freelancer until February 2026. All technical details and achievements are described in the Upply profile.
    Frontend Architecture React / Next.js Typescript GraphQL Vitest
  • Mimbus
    XR/Web Developer → Lead Developer
    EDUCATION AND E-LEARNING
    March 2016 - November 2022 (6 years and 8 months)
    Toulouse, France
    EdTech Startup, professional training simulators in extended reality, ~15 people, tech team ~10

    Role

    • Progression from XR/Web Developer to **Lead Developer**, most versatile profile after the CTO's departure.

    • Growing ownership of React frontend and C# backend, **managing features from A to Z**. XR interventions to support the most complex projects.

    XR & Simulation

    • Unity3D / C# development onprofessional gesturesimulators (industry, healthcare, construction, carpentry, electrical authorization, refrigeration, welding, high-voltage line).

    • Various supports:CAVE, VR headsets, magnetic haptic table(constellation gloves, liquid crystal glasses, 3D rear projection).
    • In-VR UI viaCoherentUI(HTML/jQuery). HP Omnicept partnership, tester and official developer.

    Web Product: Vulcan

    • React vs Angular 2 benchmark from **2016**, adopted React for the Vulcan redesign (simulator tracking system).

    • Development ofVulcan v2in React, then progressive ownership of front + C# back-end.
    • Development of anElectron launchermanaging the Vulcan licensing system and launching simulator executables with the correct arguments.

    SDK & International

    • Design and complete development of aVulcan integration SDK(Unity or DLL) for third-party partners.
    • Deployment inEurope**. On-site mission in the **United States at VRSimfor direct implementation (source code confidentiality).
    • Pre-sales at international trade shows: **ACTE Nashville (USA)**, World Employment Conference Paris.
    .NET C# Unity3D React.js

Recommendations

Be the first to recommend Kevin

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • Engineering Degree
    Efrei
    2016
    Specialité Imagerie et réalité virtuelle

Certifications

  • Microsoft Exam 70-480 (HTML/JS/CSS)
    Microsoft
    2020
    HTML5 JavaScript CSS3

Skill set

Categories