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Matthias Lechien
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Matthias Lechien

Freelance Front-End Developer — React / Next.js / TypeScript

4+ years of experience building data dashboards and SaaS interfaces with React, Next.js, and TypeScript. I build products from idea to production — discovery, UX, development, and launch — with AI at the core of my workflow.

Get in touchDownload my CV
Location
Brussels, Belgium · Remote · Hybrid · On-site
Experience
4 years of experience
Languages
French (native) · English (professional)
Portrait of Matthias Lechien, freelance front-end developer

Who I am

About

For the past 4 years, I've been building web applications with React and TypeScript: SaaS products, dashboards, data platforms and internal tools, within agile, international teams.

I don't stop at code. User discovery, Figma mockups, specification, prioritization: I take part in defining the product as much as building it. That's what lets me ship interfaces that serve a goal, not just screens.

I've also launched and run my own e-commerce brand, from market research to production. So I understand business constraints, acquisition and the end customer — and I bring AI tools into my workflow to build faster without compromising on quality.

  • Product mindset

    Discovery, UX, Figma prototyping, prioritization: I think about usage before thinking about code.

  • Entrepreneurial experience

    Founder of an e-commerce brand: I know the business stakes behind every feature.

  • AI in the workflow

    AI tools built into my development cycle to ship faster and better.

Skills

Stack & expertise

A solid front-end foundation, backed by genuine product sense and working methods proven in distributed teams.

Front-end

  • React
  • Redux
  • Next.js
  • TypeScript
  • JavaScript (ES6+)
  • React Native / Expo
  • HTML5
  • CSS3
  • Tailwind CSS

Tools & quality

  • Git
  • CI/CD
  • Code review
  • Figma (mockups & prototypes)
  • Node.js
  • Shopify
  • Leaflet
  • Supabase
  • MongoDB
  • Docker

Methods

  • Agile / Scrum
  • Product discovery & specification
  • Prioritization
  • Remote work

AI

  • Integrating AI tools into the development workflow

Background

Experience

SaaS, interactive mapping, e-commerce: four years building web products, both in teams and on my own.

  1. JavaScript Developer · Kodama Px

    April 2026 – May 2026 — Freelance engagement

    • Built an interactive mapping platform (JavaScript, Leaflet): dynamic display of activities on a map, multi-criteria filters and an interactive multi-date system.
    • Created advanced front-end forms and custom responsive UI/UX components (custom WordPress base).
    • Delivered a complete feature independently and quickly, from design to production.
    • JavaScript
    • Leaflet
    • Wordpress
    • PHP

  2. Founder — Product & Development · Racclimb

    Since January 2025 — Side venture

    • Created and launched an e-commerce brand end-to-end: market research, positioning, brand identity and goto-market strategy.
    • Designed and developed the e-commerce site (Shopify), focused on user experience and conversion rate.
    • Defined and managed the product roadmap: user-centered prioritization under real business constraints, then iterations.
    • Managed external freelancers to delegate and optimize operations.
    • Javascript
    • Shopify
    • Liquid
    • HTML/CSS
    • Meta/Google Ads
    • Figma
    • Klaviyo

  3. Front-End Developer · Famoco

    March 2022 – March 2026 — International tech scale-up · Remote

    • Developed and evolved web interfaces in React / TypeScript within an international SaaS environment.
    • Designed reusable, maintainable components, meeting performance and accessibility standards.
    • Contributed to technical decisions and to the continuous improvement of the front-end architecture.
    • Scrum Master role: facilitated agile ceremonies, planned sprints and set up a smoother workflow between Design, Product and Development enabling the team to ship features ~40% faster.
    • Worked closely with Product, Design and Back-End in Agile / Scrum; code review, version control with Git and contribution to CI/CD pipelines.
    • React
    • TypeScript
    • Mui
    • Redux
    • Chart.js
    • Leaflet
    • Figma
    • Jira
    • Vite

Projects

Proof through projects

Products designed, built and shipped to production end to end.

Preview of the Urban Boulder platform: interactive map of urban climbing spots

Flagship project

Urban Boulder

A web platform dedicated to urban climbing, allowing users to discover and share climbing spots near them. Designed and developed end-to-end, from concept and UX to development and deployment.

  • User discovery, UX/UI and prototyping
  • Next.js / TypeScript development
  • Production launch, acquisition, iterations
  • Next.js
  • TypeScript
  • Tailwind CSS
  • Supabase
Visit websiteLaunching June 2026
Homepage of the Racclimb e-commerce store

Entrepreneurship

Racclimb

An e-commerce brand created and launched end to end: market research, branding, a conversion-focused Shopify store, go-to-market and freelancer management.

  • Shopify
  • E-commerce
  • Conversion
Visit website

Contact

Let's work together

A React / Next.js engagement, a product to build or a team to strengthen? I'm available now — let's talk.

matthias.lechien@gmail.comDownload my CV