Giambattista Sabia

I'm a self-taught freelance developer based in Rome, Italy, specialised in native Android apps, AI agents and intelligent automation systems. I design, build and ship complete digital products end-to-end — from architecture and backend infrastructure to AI integration, monetisation and production release on Google Play.

I founded and developed MastroPro, a native Android app for Italian craftsmen that generates professional quotes from voice or photo input using Claude AI (Anthropic) in under 30 seconds. The app handles Italian electronic invoicing (SDI), client management, payment tracking and WhatsApp sharing — built with Kotlin 2.0, Jetpack Compose, Firebase and RevenueCat, and live on Google Play.

My other products include FitVision AI, a fitness and nutrition app with an integrated AI coach (Claude API, Firebase, Stripe, Capacitor 6), and Svolta, a multi-tenant SaaS platform for Italian driving schools with lesson booking, instructor scheduling and real-time KPI dashboards.

Core expertise: Claude API / OpenAI integration · AI agent development · Kotlin + Jetpack Compose · Flutter · Firebase (Auth, Firestore, Functions, FCM) · RevenueCat · Stripe · Python automation · React · Supabase · MVVM + Clean Architecture.

I work directly with clients — no intermediaries — and deliver production-ready code, not prototypes. Available for AI integration projects, mobile app development and custom SaaS.