Freelancer profile translated to English.

Description

React Native, NextJS Developer | Expert in Web and Mobile Applications | +7 years of experience

I am Paul, an independent Senior Full-stack Web and Mobile Developer expert in React.js/Next.js/TypeScript and React Native, and an entrepreneur based in France.

💎 I co-founded and worked on the development of the Sample app (formerly Sneakmart), a private sales application for Sneakers and Streetwear, accessible via a subscription application.

Sneakmart currently has +2500 paying members, 4.8 ⭐️ on the App Store (+4,500 reviews) and was selected for the Future 40, a selection of the 40 most promising start-ups at Station F.

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Here is what I can do for you:

📱 Mobile Application Design (iOS / Android)

🌐 Custom Web Application Development, Business Tools, Dashboards

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✅ Adherent to best practices:

Data Tracking, Conversion Optimization, Clean Code, Clean Architecture, SEO, a11y

Pair programming, Code Reviews, End-to-End Tests, Linting, Hooks, Server-Side Rendering, Clean Git, etc...

👉 Beyond a simple product delivery, I strive to bring real added value to your project. Always in line with my knowledge of the IT and entrepreneurial world, I will do my best to help you with the greatest possible commitment.

I transform your ideas into concrete projects while bringing my experience and vision.

Keywords: React, React Native, Javascript, Typescript, Next.js, Node.js, Express, Nest.js, SQL, Postgres, Mongo, FullStack, Frontend, Backend, Mobile, Web, Graphql, Craftsmanship, TDD, Clean Code, Clean Architecture

Industry field of expertise

Languages

French
Native or bilingual
English
Native or bilingual

Workplace preferences

Can work on-site

Paris (up to 50km)

The Bradery
Full Stack Software Engineer (Freelance)
E-COMMERCE
March 2026 - Today (5 months)
Paris, France
- Leading the full mobile app redesign for The Bradery (€100M+ GMV, 2M+ active users), a premium flash sales platform processing 1,000+ new products daily across React Native Expo and NestJS
- Architected the new homepage end-to-end: animated collapsing header, bestsellers carousel, upcoming sales with real-time countdown and subscribe-to-notify, glass UI effects — all behind feature flags for controlled rollout
- Drove the codebase-wide styling migration from Tamagui to NativeWind/Tailwind CSS; designed the upcoming sale preview as a modular component system (6 sub-components, full TDD coverage); authored 2 architecture RFCs adopted by the team
- Extended the NestJS BFF with API enhancements for upcoming sales and early access. ~110 commits, ~20K+ lines across 3 repos in 7 weeks with systematic test coverage
React Native Expo Mobile Application NestJs Node.js
SAMPLE (ex Sneakmart)
Co-Founder & Software Engineer
E-COMMERCE
March 2020 - Today (6 years and 5 months)
Paris, France
- Designed and deployed a cross-platform e-commerce application in React Native (Expo) from scratch, reaching over 250K active users, 20K+ paying subscribers, and 400K+ downloads

- Developed a high-performance web application and administration back office with React, Next.js, and TypeScript, optimized for SSR and static site generation

- Integrated the Shopify Storefront API for real-time stock synchronization with robust error handling and caching, and implemented RevenueCat paywalls with client-side validation and server-side receipt verification

- Set up analytics pipelines with Mixpanel, Segment, and Firebase, enabling granular funnel analysis and cohort tracking for data-driven product decisions

- Integrated OneSignal, Customer.io, and Firebase Cloud Messaging for targeted cross-platform push notifications with time-zone optimized delivery

- Drove A/B testing and conversion optimization on onboarding and purchase flows, managing over €100K in Meta/TikTok advertising budget, contributing to a cumulative revenue of €4M+
React Native Next.js Typescript Expo TailwindCSS
Gumroad – Remote
Software Engineer
SOFTWARE PUBLISHING
May 2025 - January 2026 (8 months)
New York, NY, USA
Contributed to Gumroad's open-source codebase (Ruby on Rails / React) across three feature initiatives, shipping pixel-perfect UI with minimal design feedback loops

- Rebuilt Gumroad's public-facing landing page (~25M monthly visits) from scratch with a responsive, mobile-first layout, animated scrolling categories, dark mode, and reusable Tailwind components

- Implemented a complete Stripe-integrated KYC flow for minor sellers with legal guardian verification, building the compliance model, webhook handling, and multi-step React verification UI (~3,500 lines of production code and tests)

- Designed and shipped end-to-end ISBN support for digital publications with Schema.org structured data for SEO, validated input fields, and hardened PDF file type detection
React.js Ruby on Rails Typescript Open Source Stripe