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Sylvain Joffraud l4w
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Available for full-remote contracts and fixed-price projects

About

Sylvain Joffraud

Senior Full-Stack Developer

Senior Full-Stack developer with 18 years of experience in TypeScript: Node.js (NestJS) or PHP/Symfony on the back end, React on the front end. I turn proofs of concept into production apps, retire legacy systems without breaking the service, and take over live applications — fully remote.

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Nantes · full-remote

My approach

Reliable, shipped and maintainable products.

My goal: ship reliable, maintainable web applications and get legacy projects back on track. I work as a senior developer or a lead, from the data model to deployment, fully autonomously or within product teams.

I rely on TypeScript, Node.js (NestJS, Hapi, Express), React and PHP/Symfony, with DDD and hexagonal architectures, automated tests and a well-kept CI/CD.

Key results

  • ▹ Performance — real-estate SaaS: initial JS bundle cut by 52%, while the front-end code grew by 16%
  • ▹ Reliability — health insurer: untested Symfony proof of concept turned into a production app, PHP coverage from 0 to 85% in seven months
  • ▹ Legacy — TheFork (Tripadvisor): Symfony projects retired, critical features rewritten in Node.js for 55,000 restaurants
  • ▹ Payments — HiPay: merchant back office, 3-D Secure 2.x, tokenization, PCI-DSS compliance

Transparency: every evening, a written report of the day's work.

Industries

  • ▹ Payments
  • ▹ E-commerce
  • ▹ B2B booking
  • ▹ PIM / MDM
  • ▹ Healthcare
  • ▹ Insurance
  • ▹ Real estate / LMNP
  • ▹ Events / Marketplace

Experience

My journey

18 years of experience, from IT services firms to international scale-ups.

  1. Le Journal des Nuisances

    2026 — present

    Co-founder · Full-Stack Developer

    Nantes · full-remote

  2. Eficiens · CCMO Mutuelle

    2026 — present

    Full-Stack Symfony Developer

    Paris · full-remote

  3. Datspot

    2026 — present

    Co-founder · NestJS · Flutter Developer

    Nantes · full-remote

  4. Amarris Immo

    2025 — 2026

    Full-Stack Developer React · Symfony

    Nantes · full-remote

  5. Sancare

    2025

    PHP · Symfony Developer

    Paris

  6. Akeneo

    2025

    React · Symfony Developer

    Nantes

  7. TheFork · TripAdvisor

    2021 — 2024

    React · Node Developer

    Nantes · full-remote

  8. Turbulent · Star Citizen

    2019 — 2020

    Full-Stack Developer

    Montréal, Canada

  9. Datspot

    2019 — 2020

    Full-Stack Mobile Developer

    Nantes

  10. HiPay Group

    2017 — 2019

    Full-Stack Developer

    Nantes

  11. Netapsys

    2017

    Tech Lead

    Nantes

  12. Netapsys

    2011 — 2016

    Developer

    Nantes

  13. 4lw

    2010 — 2011

    Freelance

    Nantes · full-remote

Education

BSc Computer Science
University of Nantes · 2010
Two-year technical degree, Computer Science
IUT de Vannes · 2008
Scientific Baccalaureate
2005

Languages

French
Native
English
Professional · TOEIC 895
German
Basics

Certifications

PHP 5.5 Certified
Zend

Let's work together.

Available for full-remote contracts and fixed-price projects. Let's talk about yours.

Book a call sylvain.joffraud@l4w.fr