Hi there! I'm Kevin , UI & design system specialist. From interface design to front-end development, I bridge design and tech teams to build consistent, scalable systems, for every kind of screen.

I've had the opportunity to work with major corporations, startups, agencies, and creatives such as Bêta.gouv and Grist, France TV, Accor, Yousign, Imagile, La Cordée & Checksign. You'll find client case studies further down this page that illustrate my diverse experiences.

I share my work by means of articles and conferences. Between 2017 and 2018, I organised the cssflip Meetup in Rennes, convening designers, integrators and developers to talk about front-end web topics.

Do you wish to discuss any web issues you may be having with your team? Find out more about my work? Or simply have a coffee and a chat? Feel free to write to me at this address bonjour@kevinbizien.com.

UI Design & UI Dev

contact
Kevin Bizien

UI & Design System specialist

Available for new missions, get in touch!

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UI Design

I design interfaces, from wireframe to high-fidelity mockup, built to be directly implementable in code, like on the full redesign of Yousign, where I built their first design system from a blank page. Focus on screens that hold up once they're in developers' hands.

An interface to rethink, or a product still to be designed from scratch?

Let's talk about your screens.

Design System

I build, audit or mature design systems meant to last, with the foundations, documentation and adoption to go with them, like I did at Accor on the cross-platform design system for the ALL program. Focus on solid foundations, clear documentation and real adoption by the teams.

A design system to build from scratch, or an existing one starting to show its limits?

That's exactly the kind of project I step into.

Front-end Development

I build interfaces in HTML/CSS/JS true to the mockups, on modern stacks like Vue and Nuxt, like on Yousign's marketing site, built in NuxtJS. I work directly from Figma files, to limit back-and-forth and deliver a pixel-perfect result. Focus on a scalable token and UI component architecture that keeps up with the design as it evolves.

UI design, UI development, or both at once?

I adapt to whatever the project actually needs.

Consulting

I help companies put cross-functional design processes in place. From design to interface development, the focus is on implementing scalable, maintainable solutions and tools that fit the company's needs. I help teams build bridges between designers and developers, with the goal of combining efficiency and quality.

Need help setting up a new project? Or refactoring an existing one?

Let's talk about it now!

Design System Example

Design resources for the kbizien website. Find it there the graphical charter, architecture, conventions and good CSS practices for the project.

View the kbizien design system

CSS Playground

Page dedicated to CSS basics and to experimenting with properties, selectors and good overall practices.

Play around with the kbizien CSS Playground
Diet App

2026

From spec to app: AI, React Native, Design System and Figma MCP

Building a mobile app on an unfamiliar stack. That was the starting hypothesis. React Native for mobile, Claude Code for AI-assisted development, Figma MCP to bridge designs and code. Three tools I had never used together, on a real production project.

This project documents that process end to end: how to structure your thinking with AI before touching any code, steer a build through sequenced batches, build a design system that lives simultaneously in the codebase and in Figma, and establish a two-way Code/Figma workflow via MCP. An app installed on my iPhone that I use every day.

Case study

Bêta.gouv Grist

2023-2024

Rethinking the experience of an open source data tool for the French public sector

Civil servants spend a significant amount of their time wrestling with data: spreadsheets that drift, files that multiply, information that gets lost between departments. Without the right tools, public data remains underused.

Grist changes the equation. This no-code open source tool allows any civil servant to structure their data, create custom views, and share them — without writing a single line of code, without depending on proprietary software. Hosted with full data sovereignty, actively contributed to by France at a European scale, it is a wager on public data as a common good.

Case study

Accor Smartphones

2020-2022

Book your hotel room from any device

Accor is a global leader in hospitality. The group includes iconic brands such as Sofitel, Novotel, and Ibis. In a context of growing digitalisation in the travel industry, Accor undertook a major digital transformation to improve the customer experience across all touchpoints. This project aimed to redesign the group's online booking platform, making it more intuitive, responsive, and performant across all devices.

Case study

Yousign Web Market Illustration

2017-2022

Signing your contracts has never been so simple.

Electronic signature in one click is possible and very simple with Yousign. If you have read the first part of the case study, you have discovered my work on the web application and the design system. I will now tell you about my role in the evolution of the marketing website.

Case study

Mentorship Illustration

2017-2018

Transmitting and sharing: the foundations of learning.

Transmitting knowledge and sharing have always been important values for me. Whether it's participating in professional events, working in a team or coworking space, giving conferences, organizing a meetup, providing private lessons, or facilitating practical workshops — the excitement of sharing seems essential to me for moving forward and making progress.

Case study

Yousign Illustration

2016-2019

Think digital. Sign online.

How many times have you ended up having to print out a document, sign it, scan it and send it back? Too many, no doubt. With Yousign, sign as many documents as you like with other people without wasting a single minute. And legally, of course.

Case study

La Cordée Illustration

2018

A caring work ecosystem.

Are you self-employed, or do you work remotely from home? Do you miss daily social contact? La Cordée offers warm and welcoming coworking spaces. Join the community so you never have to work alone again.

Case study

Hohey Screens

2016-2017

Find the ski resort that suits you best.

Are you planning a ski trip with your friends or family? Prepare your holidays with Hohey, a ski resort comparison site. Find the places that best suit you, compare them and choose your destination.

Case study

Guidr iOS

2014-2016

Helping expats and locals connect.

Discovering new countries and new cities is always exciting. Guidr helps expats and locals connect. Do you also get a bit scared at the idea of going abroad? Get in touch with the expat world!

Case study

Meeters

2014-2016

Connecting people via a mini-games application.

People spend more and more time on their smartphones. They spend time on social media, play games, chat via dating applications. Yet do these people truly forge real social relationships? Play2meetyou made that possible.

Case study

Writing

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UI Design & UI Dev

contact
Kevin Bizien

UI & Design System specialist

Available for new missions, get in touch!

EmailLinkedinMediumInstagramTumblrPinterestGithubCodepen