DField SolutionsMérnöki stúdió · Budapest
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CASE STUDIES · saas

Consumer self-improvement app · App Store + Play Store in 5 weeks

Zero-to-shipped iOS + Android for a self-improvement startup. Daily-challenge engine, TikTok-style short video feed, expert article library. 5 weeks from first design to App Store review pass.

Timeline5 weeks
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Reviewed by
01iOS + Android both approved on first submission (rare for RN apps).
025 weeks total from kickoff to Play Store published · 3 days later on App Store.
03Short-video feed 58-60 fps on mid-tier Android; 60 fps solid on iOS.
04OTA pipeline shipping weekly copy updates with zero review delay.
The problem01 / 03
  • 01Founder-led startup needed an MVP on both stores within a hard funding-milestone window.
  • 02Unclear whether native or React Native would win; previous vendor burned 4 months in a half-native build.
  • 03TikTok-style short-video feed needed to feel smooth on mid-tier Android (no jank).
  • 04AI-generated daily challenges had to respect GDPR (EU user data) with no signup beyond email.
The solution02 / 03
  • 01Expo managed workflow · default for the 2026 baseline (EAS Build, EAS Update, Expo Router).
  • 02Tailwind (NativeWind) + Reanimated 3 for the short-video feed · 60fps on Pixel 6 and iPhone 11.
  • 03OpenRouter-backed challenge generator behind a rate-limited proxy; PII scrubbed server-side.
  • 045 EAS Update channels (alpha, beta, prod-staged-1, prod-staged-5, prod) for gradual rollouts.
  • 05OTA-updatable copy so content teams ship weekly without store review.
The outcome03 / 03
  • 01iOS + Android both approved on first submission (rare for RN apps).
  • 025 weeks total from kickoff to Play Store published · 3 days later on App Store.
  • 03Short-video feed 58-60 fps on mid-tier Android; 60 fps solid on iOS.
  • 04OTA pipeline shipping weekly copy updates with zero review delay.
  • 05Rollback drill completed on day 28 · mean-time-to-revert < 6 minutes.
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