Open to work — senior mobile engineer, permanent role, Paris (on-site 2-4 days/week)
Arnaud Dufour
Senior React Native Engineer
React Native since 2018 · Former CTO & co-founder · AI-Native
Reims — 45 min from Paris Gare de l'Est
Summary
Senior React Native
Deep mobile specialisation since 2018: not a fullstack who can also do mobile, but a mobile engineer who can be fullstack.
Former CTO & co-founder
Happliness / Movizer: product trade-offs, scoping, technical decision-making.
AI-Native
AI embedded in the daily dev workflow, with measurable gains.
Experience
- Unlockt: full rewrite of the app from scratch (new codebase, on an existing product) — new design and new features (React Native, ~1.2M active users); Veriff & Yoti (identity verification)
- Disorder: built the entire front end (Skia, Reanimated, Stream Chat); RevenueCat monetisation
- Exposed / Vakarm: rebuilt the app from scratch and built the back end (Colyseus, real-time); RevenueCat
- Firebase & Sentry across all apps
- AI at the core of the workflow: Codex then Claude (Claude Code) progressively integrated into my daily practice — now indispensable.
- React Native mobile app development
- Contracts, Payment & Billing squad: critical customer-journey features and payment-related changes
- Mobile app built from scratch in React Native
- Contributions to the web front end as needed
- CI/CD & monitoring: Fastlane, AppCenter, Firebase, Sentry
- Technical and product leadership (co-founder)
- React Native mobile app and NestJS / GraphQL / PostgreSQL / Redis back end; Firebase
- Next.js web landing page, AWS infrastructure
- React Native mobile engineer staffed on-site (staff augmentation) with several clients
- Konectom (Biogen): launched the product from scratch within a large team (4 mobile, 3 backend, 2 data + PO/PM); built a native Swift module
- More Impact / Rift (Lita): took over the project and built new features
- Ornikar: feature development (short assignment)
- Jutheau-Husson: kicked off and set up the mobile project from scratch
- Mobile apps built from scratch: My UTT, Intégration UTT, Gala UTT (React Native)
- Added back-end endpoints (Laravel / PHP) and front-end for Intégration UTT
- TV display system for the school during the Gala (2017)
- President of the association (2017 & 2019)
Tech stack
Mobile
- React Native
- Expo / EAS
- TypeScript
- Reanimated
- Skia
- Native modules
- React Query
- Stream Chat
- MMKV
- Detox
- i18n (react-intl / i18next)
Backend
- NestJS
- PostgreSQL
- Colyseus
- GraphQL
- Redis
Infra & Tooling
- AWS
- RevenueCat
- Sentry
- Firebase
- GitHub Actions
- Veriff & Yoti (KYC)
Education
Engineering degree, SRT — Systems, Networks & Telecommunications
2020University of Technology of Troyes
TMSE specialization — Mobile Technologies & Embedded Systems.
Master's in Information Systems Security
2020University of Technology of Troyes
Languages
- French — Native
- English — C1
- Spanish — B1