Julien Grand-Chavin

French & Swiss — Based in France, open to relocation (US/EU)

about

I'm a mobile developer focused on building clean, performant apps end-to-end. I work mainly with Flutter, paired with backend tools like Go, Supabase, and Firebase. I care about fast iteration, strong UX, and clear architecture.

Before tech, I trained as a high-level athlete in the French national ski jumping program — an experience that shaped my discipline, resilience, and focus under pressure.

I usually work with my labrador Shelby sleeping next to my desk.

work

Appton — Co-Founder (2025 → Present)

appton.io

Two-person studio building mobile apps from idea to App Store. We focus on clean UX, fast iteration, and polished execution.

Freelance — Mobile Engineering (2018 → Present)

I help companies build high-quality mobile apps with strong UX, fast development cycles, and production-ready code.

Revolt Games — Co-Founder (2020 → 2025)

Co-founded the studio behind Neopolis, a mobile game played worldwide.

  • 5M players • 300K MAUs • $1.5M ARR
  • $3M+ raised
  • Best Social Game (Games Connection SF 2021)
  • Featured by Apple (2022 & 2023)

skills

Mobile: Flutter & Dart (expert), iOS/Swift (intermediate), Android/Kotlin (basics), architecture, CI/CD

Backend: Go, Node.js, Supabase, Firebase, GCP, OpenAI APIs

Other: Product strategy, UX/UI