Paseuth Thammavong

Paris · open to international work

Fullstack tech lead. Ten years as a CTO before that.

Freelance and product-minded, I help large companies ship high-stakes web products.

Paseuth Thammavong sitting on a sofa, working on his laptop

The story

Since January 2026 I have been evolving Chanel’s CMS: the publishing platform teams use to feed the website worldwide, China included. Before that, I worked on FDJ’s high-traffic betting platform.

Earlier, I co-founded Weloop, a B2B SaaS for collaborative feedback, and served as its CTO for 10 years: from the first line of code to adoption by 15+ large accounts, 100,000+ users in 40+ countries. Along the way I hired and managed a product team of more than 10 people. I then handed over to the team in place to start new projects.

What I bring

  • Designing a product’s architecture, from scratch or from an existing codebase
  • Turning a vague need into a product people actually use
  • Hiring, structuring and growing a tech team
  • A founder’s product vision, with hands in the code
  • TypeScript
  • React
  • Next.js
  • Node.js
  • PostgreSQL
  • Supabase
  • Vercel

Journey

2026
2025
2024
2022
2019
2018
2014
Chanel since Jan. 2026 The CMS behind chanel.com across all markets: the back office used by content teams worldwide, and the server-side rendering of the public site.
Highlights
  • Driving technical choices for the CMS
  • Migrating components and the grid system to Chanel’s new design system, with the design team
  • Optimising server-side rendering and fixing hydration issues
  • New features on the CMS and the website
  • Diagnosing and fixing production incidents
  • Shipping releases with QA and the release manager
  • React
  • Node.js
  • NestJS 11
  • Drizzle ORM
  • PostgreSQL
  • SSR
  • Design system
FDJ United Sept. → Dec. 2025 Modernising the front end of the betting platform, a critical high-traffic system, on Next.js 15. Four months, then Chanel asked me to join them.
Highlights
  • Driving the front-end architecture and the design system’s evolution
  • Rebuilding the design system with the design teams, with a focus on accessibility
  • Storybook and tailwind-variants to unify the UI
  • Migration to Tailwind 4
  • Next.js
  • React
  • TypeScript
  • Tailwind CSS
  • Storybook
  • Accessibility
Handing over After ten years on the same product, I had come full circle. I hand Weloop over to the team in place and go freelance to work on varied ground. In 2026 the product pivots to AI with V3.
Weloop V2 €1M in annual revenue, V2 industrialised.
The team grows 10 people hired and managed, front and back-end devs, DevOps, UI/UX, PO, serving 15+ large accounts. See the photo
The Refiners, San Francisco Weloop among the 15 European startups in the accelerator. Technical overhaul for large accounts, and a €1.5M raise, notably from Kima Ventures.
I launch the startup Weloop 10 years CTO of a B2B SaaS for collaborative feedback, from the first line of code to 100,000+ users in 40+ countries.
Leadership & architecture
  • Product: I owned the roadmap and the strategy around it, prioritised customer needs and framed the team’s work, from MVP to scale
  • Architecture: technical direction over the product’s whole lifetime
  • Moving to microservices and decoupled services, shared multi-tenant PostgreSQL
  • React / Next.js front end with a reusable design system and Tailwind CSS
  • GDPR compliance and security on Microsoft Azure, CI/CD with GitHub Actions
  • React
  • Next.js
  • Node.js
  • PostgreSQL
  • Supabase
  • Azure
  • GitHub Actions
  • Microservices
  • Team management
See the photo

Along the way

Notebook

2026 · 001 / 003

001 Paseuth working on his laptop in morning light
002 The Weloop team on WAI’s rooftop terrace above Paris
003 Paseuth and a colleague presenting Weloop in front of a screen at Station F
004 The Weloop team gathered at the office, glasses in hand
005 The Refiners t-shirt on a desk, an apple beside it
006 Victor pitching Weloop in San Francisco, the founding team slide behind him
007 End of a day at the Weloop office, the team tired but glasses in hand
008 The first Weloop team at the Paris office, celebrating the first big contract around an inflatable tiger head
009 Weloop’s first office: a wooden table, two laptops and a flip chart

What they say

He quickly grasps the project’s context and architecture, and above all he makes reliable, relevant choices you can genuinely build on. […] Beyond the technical side, Paseuth has a real product and design sensibility.

David LouTech lead · FDJ United project

He carried the whole technical side and the product vision. […] He also managed a team of 10 over the course of the adventure. Paseuth always thinks about usage and the product, not just the code.

Victor ArfiCEO and co-founder · Weloop

Recommendations received on Malt, 2026. Translated from French.

Contact

A product to build, a team to structure? Let’s talk.

Paris · open to international work

© 2026 · Paseuth Thammavong