Rémi Charreau

Rémi Charreau

Design Engineer @ Vibe.coAvailable

Design Engineer covering both design and front-end, end-to-end, with 16 years of experience. I specialize in complex B2B SaaS.

Lyon, France·
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What I do

Product Design

I make complex products simple and beautiful, designing in code with Claude Code.

  • User flows, UI design & prototyping
  • Design systems & component libraries
  • Design tokens & theming
  • Claude skills that codify how I design

Front-End

I turn those prototypes into clean, production-ready code (typed, tested & reviewed code).

  • Next.js, React, TypeScript, Tailwind
  • Animations & micro-interactions (Framer Motion)
  • Responsive, accessible & performant layouts
  • Agentic coding: skills, context & guardrails

Experimentation

I design with data: instrument, test, learn after launch, change course when the evidence says so.

  • Instrumentation & event tracking
  • A/B test design, analysis & rollout decisions
  • Dashboards & metrics monitoring
  • Post-launch iteration on product & web surfaces

Work

2026
2025
2024
2023
Vibe.co

Vibe.co · Design Engineer · Mar 2023 — Now

Design Engineer at a New York-based CTV advertising SaaS, owning the platform UI and web surfaces end-to-end. Acquired by Walmart in June 2026.

  • Owned product features solo, end-to-end: from mockup to deployment (Next.js, React, TypeScript, shadcn/ui & Framer Motion)
  • Redesigned core areas of the platform: navigation, main dashboard, settings, and modules of the campaign builder
  • Implemented the design system & component library with shadcn/ui, styled to match Tailwind UI
  • Owned client onboarding and the public website end-to-end

Key results

  • Rebuilt the entire settings area in 6 weeks (2023): members, advertisers, billing, invoices & measurement, still live today, unchanged
  • Redesigned client onboarding over 5 tested iterations, with +12% and +15% completion lifts (statistically significant)
  • Built a video ad creator in 3 months with one other engineer (backend)
  • Fixed an onboarding blocker in 2 days: +6–10% completion, ~$70K/mo
  • Ran 30+ A/B tests across sign-up, onboarding and web pages, worth an estimated $3.7–5.5M in media efficiency over two years
2023
2022
Hexa/eFounders (Cohort)

Hexa/eFounders (Cohort) · Design Engineer · Jun 2022 — Mar 2023

Covering design and frontend at Cohort, a B2B SaaS loyalty platform built within eFounders / Hexa, one of Europe's leading startup studios. Acquired by Brevo in 2025.

  • Design system built from scratch
  • Back-office interface for brand teams
  • White-label customer-facing platform

Key results

  • Shipped the first version of the product in 3 months, working directly with the CTO, which brought in the first 10 clients
2021
2020
invoxia

invoxia · Head of Product Management · 2020 — 2021

Improved the mobile app and the B2B SaaS platform for this connected asset-tracking company.

2019
2018
2017
DentalMonitoring

DentalMonitoring · Product Manager & Designer → Head of Design · Dec 2017 — 2020

Embedded with a mobile team of 5 developers as both Product Manager and Designer to fully redesign the patient-facing scanning experience.

  • Full redesign of the mobile scanning experience
  • Created the mobile design system
  • Integrated ML algorithms into the patient scanning flow
  • Managed the mobile team roadmap & delivery

Key results

  • +2 stars on app stores after the revamp, now rated 4.7/5
  • +800% growth in app users
2016
SimpliField

SimpliField · Product Manager & Designer · 2016 — 2017

Product design and feature delivery on a retail execution platform, including its design system built from scratch.

2015
2014
2013
2012
2011
2010
Freelance / Co-founder

Freelance / Co-founder · Designer / Developer · 2010 — 2015

Freelancing for clients while building my own products on the side.

  • Websites built with CMS and JavaScript
  • Mobile apps in Swift

Key results

  • 27 clients across 55 projects
  • Concours AST, B2C learning platform I founded and built with a team. Sold to ecole2commerce.com in 2012.
  • Sleepy, Health B2C iOS app I founded and built in Swift (~35k downloads).

Selected work

Empty state settings
Video Ad Creator
Launch Modal
3D Tile Background
Onboarding Flow
Calendar component
Time Slots
B2B Landing Page
Demo Filter
Coupons

Testimonials from LinkedIn

Rémi has been freelancing with us at Vibe for several months, and we've been impressed with his contributions. His unique combination of design and front-end development skills makes him exceptionally effective and valuable in the fast-paced startup/scale-up environment. He has the ability to independently develop his designs into functional solutions. Rémi takes strong ownership of his work and consistently delivers on time with meticulous attention to detail.
Nicolas Hémidy

Nicolas H.

Head of Product @ VibeManaged Rémi directly · Dec 2023
Rémi has been working with us at Cohort for a few month as a freelancer and we have been extremely pleased with his work. He started doing Product Design, and we were really pleased by the overall quality of the designs and the speed of his work. He also worked on implementing his design in React with TypeScript and Tailwind CSS. He showed a great attention to detail and was again able to implement very high quality code faster than expected. Finally, during his entire mission Remi was really committed to the project, easy to talk to, received feedback very well and was contributing to a great team atmosphere!
Nathan Barraillé

Nathan B.

Co-founder & CTO at Cohort (ex Google/LinkedIn)Managed Rémi directly · Sep 2022
I had the opportunity to work with Rémi on the complete overhaul of our SaaS website. What started as a planned modernization of our pages went well beyond a visual refresh: he challenged our business needs with an approach centered on usability and clarity. Thanks to Rémi, we now have a site with a coherent, clean structure and pages, along with a logo perfectly aligned with current standards. Rémi was extremely proactive, transparent in his communication, and always available to answer our questions or respond to our various requests. He has become a true trusted partner for us, and we'll turn to him for our next needs without hesitation.
Rudy Goury

Rudy G.

Co-founder at Vook.aiClient · Jul 2025
I had the pleasure of working with Remi as a freelancer on Baback, and I want to highlight his outstanding skills in design and development. His contribution was crucial in enhancing the overall user experience of the application. Remi is a pragmatic designer who delivers elegant and easily implementable solutions. His expertise greatly strengthened our product, and I highly recommend him.
Benoît Tallandier

Benoît T.

Co-founder & CTO at BabackManaged Rémi directly · Nov 2023
I can only recommend Rémi for his skills as a designer, graphic artist, and website creator. During the project we entrusted him with, he showed impressive creativity, expertise, and efficiency. He also remains available long after a project is finished. I look forward to the idea of working with him again.
Jean-Marc Sabet

Jean-Marc S.

CEO & Founder @ b-sharpeClient · Jan 2015
We worked with Rémi on revising our logo and brand guidelines, as well as redesigning our website. What we appreciated most about this collaboration: his understanding of our needs, his strong proposals, his technical skills, and his responsiveness. The rate was also entirely fair, and we were very satisfied with his work.
Jordan Guyon

Jordan G.

Chief Operating Officer at Lys TherapeuticsClient · Nov 2014

Learning

2025Animations.dev — Online course by Emil Kowalski

2023Next.js — Online course by Maximilian Schwarzmüller (udemy.com)

2022Refactoring UI — Book by Adam Wathan & Steve Schoger

2021How To Write Unmaintainable Code — Book by Roedy Green

2020TypeScript — Online course by Maximilian Schwarzmüller (udemy.com)

2019The Design of Everyday Things — Book by Donald Norman

2019React.js — Online course by Maximilian Schwarzmüller (udemy.com)

2018(Design) Sprint — Book by Jake Knapp

2017Atomic Design — Book by Brad Frost

2016Designing Interfaces — Book by Tidwell, Brewer & Valencia

2016The Lean Startup — Book by Eric Ries

2015Swift — Online course by Lynda.com

2011JavaScript — Online course by Lynda.com

2007Flash & ActionScript 3 — Book