React Native, Expo, and mobile delivery
I modernize React Native apps with Expo.
I help teams move away from fragile mobile stacks, stabilize releases, and regain control of Expo/EAS. Questovery, my geolocated treasure hunt product, keeps that work grounded in real usage.
Current focus
Mobile + product
- React Native legacy audits
- Expo/EAS migration delivery
- Field lessons from Questovery
Operating lane
Mobile apps that are easier to ship
I turn fragile native workflows into fast QA, predictable store releases, and team ownership.
Two focus areas
What I can do for your app
I mostly step in when a React Native app needs solid Expo foundations and a delivery workflow the team can keep owning.
React Native to Expo migration
Audit, migrate, and stabilize an existing app so your team can ship with Expo/EAS without fighting native complexity.
- Native dependency audit and migration roadmap
- Incremental Expo/EAS rollout without blocking the roadmap
- QA, store release, and hotfix playbook
Questovery
A geolocated treasure hunt platform with a participant mobile app. It is my real-world Expo lab for maps, offline behavior, geolocation, and field UX.
- React Native + Expo participant app
- Geolocation, routes, and field constraints
- SaaS creator experience connected to mobile delivery
Concrete cases
Projects close to your challenges
Examples of engagements where the work was to take over an existing base, ship to production, or make a team more autonomous.
Product / company
Consumer mobile app to book and manage campervan stays.
Impact / contributions
Mobile redesign + migration from legacy React Native to Expo.
Mobile lead for project structure and team enablement.
Product / company
Mobile app to stay connected with elderly relatives.
Impact / contributions
React Native build from scratch aligned with the web app.
Key features: reminders, messaging, photo sharing, video calls.
Product / company
Mobile app delivering push alerts for Bordeaux bridge lift times.
Impact / contributions
Personalized notifications based on user time slots.
Notification scheduling powered by Trigger.dev.
Product / company
Platform to create treasure hunts with a participant mobile app.
Impact / contributions
Interactive experiences built on geolocation.
Custom routes for events and tourism.
Migration method
How I make your Expo migration safer
We reduce release risk first, then move step by step toward an Expo workflow the team can maintain.
Audit the native surface
Map dependencies, app config, CI, store constraints, release pain, and Expo compatibility before touching the roadmap.
Migrate incrementally
Upgrade React Native and Expo in controlled steps, replace incompatible modules, and keep the product branch shippable.
Stabilize releases
Set EAS Build, Submit, Update, channels, fingerprints, and QA distribution rules that match how the team ships.
Transfer ownership
Document decisions, playbooks, and fallback paths so the internal team can keep releasing without a consultant in the loop.
Testimonials
What teams say after working together
Feedback from people who trusted me.
"Simon is great to work with: experienced, collaborative, and immediately involved. He adapted quickly and worked in synergy with our historic developer, giving us confidence in the long-term development of the project."
Eric
CEO, Vaerdict
"Great experience with Simon. Easy communication, very professional, high code quality, and fast delivery. We trusted him with a new mission after this one."
Anthony
CEO, LiNote
"I had the opportunity to work with Simon for over two years on my team. Simon is a true Full Stack developer: he improves UI components, backend or mobile, and can also optimize cloud infrastructure or CI/CD pipelines. He brings effective architecture ideas and quickly learns complex concepts."
Thomas
CTO, Silbo
Ready to ship
Let's talk about your mobile project.
Share the context and I'll come back within 48 hours with clear next steps.