Personal project · Dual-Stack Studio
Personal project · Dual-Stack Studio
El Dulce de la Nonna · Live client project
MVG Lash & Brow · Live client project
Bumerán
"Lo que das, vuelve" — neighborhood favor exchange
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About the project
A neighborhood favor-exchange app for requesting help, offering assistance, or giving items away — filtered by GPS across 13 categories. Users see only complementary content: those seeking help see offers and gifts, helpers see requests. In active development under Dual-Stack Studio with Claude Sonnet 4.6 as engineering partner.
Key features
- Three post types — necesito, ofrezco, regalo — with intent-aware feed filtering so users only see complementary content
- Full-screen map with color-coded pins per post type, plus a swipeable bottom sheet (20/45/85% snap points) for browsing
- Safety modal with real-world tips before WhatsApp handoff — exact GPS location is never shown publicly
- Twilio SMS verification (6-digit code, 10-minute expiry) — one phone number per account, enforced server-side
- Full connection lifecycle — pending → accepted → completed/cancelled — with a review system for local reputation
- NestJS backend with global rate limiting (100 req/min per IP) and Helmet security headers
- Google OAuth + JWT authentication, session persisted via AsyncStorage with automatic restore on launch
- Spanish, English and German localization, GDPR-compliant with a reusable legal footer across 4 screens
- Live in production on Railway
- Built with Claude Sonnet 4.6 as daily AI pairing partner throughout the build
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