Alfredo A.

React Native Developer | Expo, Supabase, Next.js | Full-Stack

I take your app from Figma to production — one senior developer, no coordination overhead • Top Rated • React Native & Node.js • Apps in Production I build mobile apps that handle real complexity: offline-first data sync, real-time WebSocket integrations, complex authentication flows, payment systems, and AI-powered features. On the backend I work with Supabase (Postgres, Auth, Edge Functions) and Node.js/Express when a custom API is needed. I also work with MongoDB for document-oriented projects. When the project needs web, I deliver with React, Next.js (App Router), and the same quality bar. Shipped and running: - Social marketplace app: 5-year engagement, real-time chat, bidding system, Google/Apple OAuth, Twilio SMS (React Native + Parse/MongoDB) - EV fleet management: cross-platform mobile + web, API optimization from 5-8s → < 1s, CI/CD from scratch, test coverage 30% → 98% (React Native) - Expense tracker: offline-first SQLite sync, AI receipt scanning (Gemini), Stripe payments, multi-currency settlement engine — live on Play Store and as PWA (React Native + Expo + Node.js) - DEX arbitrage dashboard: real-time WebSocket price feeds, Uniswap/SushiSwap, candlestick charts (React Native + ethers.js) - Client portal SaaS: multi-tenant, role-based access, real-time messaging, file sharing, i18n, dark mode (Next.js + Supabase) Mechatronics engineering background — I think in systems, not just screens. Startup experience at Luna DNA (genomics/healthcare) and Nuvve (EV fleet management). 6+ apps on Play Store. 100% Job Success comes from asking the right questions before writing a single line of code. You handle the vision. I design, build, and ship the system behind it. Message me your project's biggest challenge —I'll tell you how I'd approach it.