Alfredo A.

Need an app that works beyond the demo? I'm a senior full-stack developer who takes products from Figma to the App Store and Play Store — mobile, web, backend and AI, built by one person who owns the whole system. Top Rated • 100% Job Success • 6+ years • 6+ apps in production Most apps break at the hard parts. Those are the parts I specialize in: • Works offline — data syncs automatically when the connection returns, nothing lost • Updates in real time — chat, live feeds and notifications over WebSockets • Takes payments — Stripe marketplaces with payouts, milestone payments and subscriptions • Uses AI that's actually useful — assistants, receipt extraction, image generation, smart search and auto-categorization • Keeps data secure — per-user data isolation, Google/Apple sign-in, biometric lock, encryption • Grows without rewrites — clean architecture, server-side business logic, automated tests and CI/CD Recent results: • Cut API load time from 6s to under 1s and raised test coverage from 30% to 98% in 2 weeks for an EV fleet platform • Built and maintained a home-improvement marketplace for 5 years: bidding, milestone payments, real-time chat and an AI cost estimator • Launched an offline-first expense tracker with AI receipt scanning on Play Store and web • Built a multi-tenant client-portal SaaS with AI-generated project briefs and Stripe subscriptions • Built a real-time DEX arbitrage dashboard with live on-chain price feeds Stack: React Native (Expo), React, Next.js, TypeScript, Node.js, Python/FastAPI, Supabase, Postgres, Firebase, MongoDB, Parse, Stripe, Gemini, Docker, Google Cloud Run Startup experience at LunaDNA (genomics/healthcare) and Nuvve (EV fleet management), plus a Mechatronics Engineering degree — I think in systems, not just screens. My 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. Tell me your project's biggest challenge, and I'll tell you how I'd approach it.