Rémi Charreau
Design Engineer
remi.charreau@gmail.com
Lyon, France (CET/CEST)
linkedin.com/in/remicharreau
remicharreau.com
Design Engineer covering both design and front-end, end-to-end, with 16 years of experience — including a background in product management and design leadership from 2016 to 2021, hands-on as a design engineer again since 2022. I specialize in complex B2B SaaS — simplifying dense products, shipping interfaces that are functional and polished, and driving growth through the sites and landing pages I build. I own the work from first sketch to production code, removing the back-and-forth between designer and developer.
What I do
Product Design
- User flows, UI design & prototyping
- Design systems, tokens & theming
- Claude skills that codify how I design
Front-End
- Next.js, React, TypeScript, Tailwind
- Animations, accessible & performant layouts
- Agentic coding: skills, context & guardrails
Experimentation
- Instrumentation & event tracking
- A/B test design & analysis
- Dashboards & post-launch iteration
Experience
Vibe.coDesign Engineer
2023 — PresentDesign 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, using Next.js, React, TypeScript & Framer Motion
- Redesigned navigation, main dashboard and campaign builder modules
- Rebuilt the entire settings area in 6 weeks (2023), still live today, unchanged
- Built a video ad creator in 3 months with one other engineer (backend)
- Redesigned onboarding over 5 tested iterations (+12%, +15%); fixed a blocker in 2 days: ~$70K/mo
- Ran 30+ A/B tests across sign-up, onboarding and web pages, worth an estimated $3.7–5.5M over two years
Hexa / eFounders — CohortDesign Engineer
2022 — 2023One of Europe's most prestigious startup studios. Shipped the first version of a B2B SaaS loyalty platform, owning the entire frontend and design. Cohort was acquired by Brevo in September 2025.
- Built the design system from scratch
- Shipped the first version in 3 months working directly with the CTO, which brought in the first 10 clients
- Back-office interface for brand teams
- White-label customer-facing platform
invoxiaHead of Product Management
2020 — 2021Improved the mobile app and the B2B SaaS platform for this connected asset-tracking company.
DentalMonitoringProduct Manager & Designer → Head of Design
2017 — 2020Embedded with a mobile team of 5 developers to fully redesign the patient-facing scanning experience.
- Full redesign of the mobile scanning experience
- Drove +2 app store stars (now 4.7/5) and +800% growth in app users after the revamp
- Integrated ML algorithms into the patient scanning flow
- Managed the mobile team roadmap & delivery
SimpliFieldProduct Manager & Designer
2016 — 2017Product design and feature delivery on a retail execution platform, including its design system built from scratch.
Freelance / Co-founderDesigner / Developer
2010 — 201527 clients, 55 projects: websites and mobile apps, design and code.
- Founded Concours AST (B2C learning platform, sold in 2012) and Sleepy (iOS health app, ~35k downloads)
Generated from remicharreau.com — full version includes selected work (videos) & more.
Rémi Charreau
Design Engineer @ Vibe.coAvailable
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.
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
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
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
invoxia · Head of Product Management · 2020 — 2021
Improved the mobile app and the B2B SaaS platform for this connected asset-tracking company.
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
SimpliField · Product Manager & Designer · 2016 — 2017
Product design and feature delivery on a retail execution platform, including its design system built from scratch.
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
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 H.
Head of Product @ VibeManaged Rémi directly · Dec 2023Rémi 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 B.
Co-founder & CTO at Cohort (ex Google/LinkedIn)Managed Rémi directly · Sep 2022I 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 G.
Co-founder at Vook.aiClient · Jul 2025I 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 T.
Co-founder & CTO at BabackManaged Rémi directly · Nov 2023I 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 S.
CEO & Founder @ b-sharpeClient · Jan 2015We 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 G.
Chief Operating Officer at Lys TherapeuticsClient · Nov 2014Learning
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