Facundo Ezequiel S.

Full-Stack AI Developer building SaaS platforms, mobile apps, APIs, and AI-powered products. I help startups and businesses turn ideas into working software — from MVPs to production applications. My focus is full-stack development + practical AI integration. I can work across frontend, backend, databases, APIs, authentication, payments, automations, and deployment, while integrating AI where it creates real value for the product. Recently, I’ve worked on a production business-management SaaS with real users, contributing across a complex existing codebase involving CRM, project management, workflows, automations, files, permissions, payments, integrations, and AI-powered functionality. I’m comfortable joining an existing product, understanding how the system works, fixing bugs, improving architecture and performance, and building new features end-to-end. 🤖 AI & Automation • OpenAI, Claude and Gemini integrations • LLM-powered features and AI assistants • AI workflows and business automation • API integrations and data processing • AI-assisted application development 💻 Full-Stack & SaaS • React, Next.js, JavaScript & TypeScript • Node.js and PHP/Laravel • REST APIs and third-party integrations • PostgreSQL, MySQL, MongoDB, Supabase & Firebase • Authentication, roles and permissions • Stripe payments, subscriptions and webhooks • SaaS dashboards and complex business workflows 📱 Mobile Development • React Native & Expo & Flutter • Cross-platform iOS and Android applications • API-connected mobile apps • Authentication and real-time functionality ⚙️ Tools & Deployment • Git & GitHub • Docker • Vercel & Railway • Cloud infrastructure and storage • Claude Code, Cursor, ChatGPT & GitHub Copilot I also build my own products, including Wayo AI and DUFIT, which allows me to work beyond isolated development tasks and understand the complete product lifecycle — from an idea and architecture to implementation, testing and iteration. What I can help you build: • AI-powered SaaS applications • SaaS MVPs • Web and mobile applications • AI assistants and LLM integrations • REST APIs and backend systems • Business automations • Stripe subscription systems • Existing application improvements and new features • Third-party API integrations I care about understanding the product and the business problem behind it — not just completing tickets. If you need a Full-Stack AI Developer who can work across the application, integrate AI and APIs, and help turn requirements into a working product, feel free to send me a message.