Facundo Ezequiel S.

Senior Full-Stack AI Engineer | SaaS MVPs, Mobile Apps & Automation

100% Job Success | Top Rated | 5.0★ Average Senior Full-Stack AI Engineer building production-ready SaaS platforms, mobile apps, marketplaces, booking systems, and AI-powered workflows. I help startups and product teams turn ideas into real software: clean architecture, scalable databases, authentication, payments, dashboards, automations, AI integrations, and deployment. I do not only build screens. I take ownership from product logic to production. What I build: SaaS MVPs: onboarding, dashboards, roles, permissions, admin panels Mobile apps: React Native / Expo, auth, premium features, app-ready builds AI integrations: Claude, OpenAI, Gemini, image analysis, document processing, AI-assisted workflows Payments: Stripe Checkout, subscriptions, webhooks, customer portals Booking systems: calendars, availability logic, confirmations, admin workflows Marketplaces: listings, transactions, search, maps, custom business logic Automations: Make, n8n, Zapier, CRM/email/SMS workflows Product architecture: database design, API structure, edge cases, deployment, handoff Tech stack: Next.js, React, TypeScript, React Native, Expo, Node.js, Laravel/PHP, PostgreSQL, Supabase, Firebase, Stripe, OpenAI, Claude API, Gemini, Mapbox, Tailwind, Docker, Vercel, Railway, Render, GitHub. Recent work: AI fitness mobile app with React Native, auth, AI-generated plans, image analysis, and premium features Production SaaS platform with Next.js, Supabase, AI workflows, auth, database/RLS, and billing flows Booking/customer management platform with calendar logic, admin dashboard, customer profiles, notes, reminders, and payments Marketplace-style systems with listings, transactions, ownership logic, search, and admin workflows AI document automation: PDF extraction, rule-based validation, structured Excel/report output eSIM e-commerce flow with checkout, digital product delivery, order management, and admin operations How I work: Clear communication Fast MVP delivery without messy architecture Strong product judgment, not just code execution AI-assisted development with Claude Code, Cursor, ChatGPT, Copilot, and OpenAI tools Comfortable joining existing codebases, fixing complex issues, and shipping improvements quickly I am currently working on production SaaS systems with real users, including complex workflows, payments, permissions, automations, files, and AI-assisted product development. Native Spanish, professional English. Flexible with time zones. Looking for startups and teams that need someone who can own the build, think through the product, and ship reliable software.