# Freelance software developer, web and mobile

Type: homepage
Language: en-US
Canonical URL: https://simonboisset.com/en

I design and build web and mobile apps in TypeScript, from the interface to the API, all the way to production. Since 2020, for startups and SMEs, as extra hands in the team or as tech lead, with React, React Native and Node.js.

## What I do

- Team reinforcement: Shipping the next features with your team: web, mobile and API, all the way to production.
- Taking over an app: Understanding an existing codebase quickly, clearing technical priorities, putting structure back where it is needed.
- Building an app: Designing and shipping a web or mobile app from scratch, aligned with your existing product.
- Tech lead: Evolving the architecture and supporting the team in its technical choices.

## What I delivered

- CAMPING-CAR PARK (03.2024 – 09.2025), React Native · mobile lead. context: Booking app in production, built on an ageing React Native codebase. action: Migration to Expo: unmaintained libraries replaced, build and release pipeline configured. Then a redesign in 2025, booking and maps, with the product and back-end teams. result: An up-to-date Expo codebase, more reliable releases and a team supported over time. Expo · CI/CD · maps
- MOBIAPPS (10.2025), React Native · Expo migration. context: Legacy React Native app to modernise. action: Migration to Expo: native configuration, Expo plugins, dependencies and React Navigation. Expo · config plugins
- VAERDICT (since 2024), Full-stack · tech lead. context: Business web app to evolve, with an internal team. action: Re-architecture to make it scale, tech lead of the team. result: A more scalable codebase, a supported team. React · Node.js · TypeScript
- LiNote (2023), React Native · new app. context: Web communication platform with no mobile app. action: App built from scratch: messaging, photo sharing, video calls, notifications and alerts. result: Key features shipped on iOS and Android. Expo · iOS · Android
- Silbo (2020 – 2022 · employee), Full-stack. context: Web and field apps for healthcare. action: Full-stack development, real time, production operations. result: Apps shipped and used every day. Node.js · TypeScript · React · React Native

## Client feedback

- Eric: We started from a fairly complex legacy codebase. Simon took over the project, brought structure back to the whole stack, and still supports us day to day.
- Julie: Simon built our React Native app from scratch while keeping it aligned with the existing web app. In a few weeks, we had reminders, messaging, photo sharing, and video calls.
- Matthieu: We had been dragging this Expo migration for more than a year. Simon reassured us, delivered it in two weeks, and we were able to publish a clean version afterwards.
- Thomas: Simon joined a project where frontend, backend, mobile, and infrastructure were all tied together. He quickly understood how everything fit together, which saved us a lot of back and forth.
- Romuald: Simon migrated three of our React Native apps to Expo after more than 9 years of maintenance. The migration went smoothly, and we are already seeing the benefits: much faster upgrades and finally reliable builds.
- Antoine: Our mobile codebase had become too complex: too many special cases, too many dependencies, and not much certainty left. Simon helped us regain control and put a clear structure back in place.

## One expertise, one product

- React Native → Expo migration (expertise): Moving a legacy React Native app to Expo without blocking releases, including apps maintained for more than nine years.
- Questovery (my product · since 2024): Treasure hunts, scavenger hunts and guided tours: a web workspace for organisers, an iOS and Android app for players. Designed, built and sold on my own.

## Skills

- Mobile: React Native, Expo, EAS, push notifications, geolocation, store releases
- Web: TypeScript, React, TanStack Start
- Back end & delivery: Node.js, oRPC, Effect TS, Bun, PostgreSQL, Drizzle, Docker, GitHub Actions, CI/CD
- Agentic AI: Claude Code, Codex, MCP
- Product: UX/UI, user journeys, marketing, sales
- Education: Master's in Laser Physics, Université Lille 1, 2014. Software development, self-taught, project by project, since 2015.

## Contact

- I enjoy joining an existing product, understanding its constraints and moving it forward with the team in place. If your web or mobile app needs an extra pair of hands, I would be glad to talk.

## Related links
- [Website](https://simonboisset.com/en)
- [Expo migration](https://simonboisset.com/en/expo-migration)
- [Questovery](https://simonboisset.com/en/questovery)
- [Background](https://simonboisset.com/en/about)
- [Resume](https://simonboisset.com/en/cv)
- [Resume (PDF)](https://simonboisset.com/cv/Simon-Boisset-CV.pdf)
- [Blog](https://simonboisset.com/en/blog)
- [Legal documents](https://simonboisset.com/en/docs)
- [Schedule a call](https://cal.eu/simon-boisset/meet-simon)