FullStack Next.js PWA (Drizzle, PostgreSQL, Jest).
• Features: Workout & nutrition + offline support + Stripe payments.
• API NestJS: Client biometrics ➔ complete diets and food interaction.
• Microservice Go: Real-time voice interaction + media processing in S3 via Redis.
• Infra: Docker, CI/CD (GitHub Actions), VPS (Hetzner).

Backend Spring Boot (Hibernate, PostgreSQL + JSONB, MockMvc tests).
• Architecture: Strategy/Factory to scale by medical specialty (polymorphism).
• Passwordless: OTP with JWT and Refresh Tokens + Fingerprint HttpOnly cookies.
• Multimodal Interaction: Vite ↔ Go in real time (voice/image) for progressive context of the patient.
• Backend: Receive context, analyze and apply medical logic supported by a VLM model.
*Advanced analysis in development (Vector DB, Scikit-learn). Infra in Docker + AWS.

3-Layer IoT System integrating hardware and software.
• Backend: Node.js, Express, MongoDB, and Cron Jobs (time-based logic).
• Mobile App: React Native (TypeScript) and Firebase (Auth/Push).
• Real-Time Communication: Socket.io synchronized with physical world events and roles.
• ESP32 Firmware: C++ (PlatformIO), RFID reading, and encrypted MQTTS over RabbitMQ interacting with the App's UI logic.

Legacy refactoring in PHP (CodeIgniter 4) and JavaScript.
• Architecture: Translation of fiscal rules into MVC/REST + new features.
• Database: Redesign of a MySQL "spaghetti-schema", fixing inconsistencies and optimizing queries.
• Automation: Dependency and migration management with Composer.
• Infra: CI/CD implementation (GitHub Actions), improving deployments and maintainability.

End-to-end TypeScript Monorepo.
• Stack: Sharing types between backend (Node.js, Socket.io) and dual frontends (React/Web and Vite/PWA).
• Real-Time: Low-latency state synchronization and event handling.
• Infra: Process management with PM2, testing with Jest, and CI/CD with GitHub Actions.