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Hola, soy Stefan. Desde 2014, he ayudado a empresas de comercio electrónico, salud e inteligencia artificial a resolver complejos desafíos técnicos, desde aplicaciones web de alto tráfico hasta integraciones API de misión crítica. Soy el puente entre las necesidades de negocio y la ejecución técnica, entregando soluciones que son escalables, seguras y mantenibles.

? Dominio de la pila completa: Frontend (2014) → Backend/APIs (2019) → Sistemas de extremo a extremo.
? API Whisperer: más de 100 integraciones (Stripe, Shopify, Twilio, OpenAI, etc.)
? Probado en la industria: Sistemas construidos que manejan más de 10K pedidos/día, datos que cumplen con HIPAA y automatizaciones de IA.
? Los clientes se quedan conmigo porque entrego resultados, no solo código

? Cómo resuelvo los problemas
✅ Desarrollo centrado en API: REST, GraphQL, WebSockets - desde el diseño hasta el despliegue.
✅ Automatización de flujos de trabajo: Zapier/Make o scripts personalizados (ahorrado a los clientes más de 500 horas/año)
✅ Rescate de sistemas heredados: Arreglar integraciones rotas, reducir la deuda tecnológica, mejorar el rendimiento
✅ Full-Stack Builds: React, Node.js, Django, o PHP - con arquitectura para el crecimiento

? ¿Por qué trabajar conmigo?
✔ Enfoque de negocio primero: Me centro en tu ROI, no solo en las especificaciones tecnológicas.
✔ 10 años de cicatrices de batalla: He visto lo que se rompe-y cómo evitarlo.
✔ Código limpio y documentación clara: Tu equipo (o futuros desarrolladores) no me odiarán.
✔ Sin sorpresas: Actualizaciones regulares, plazos realistas, entrega dentro del presupuesto.

? Tecnologías que domino
Lenguajes: Python, JavaScript, TypeScript, PHP, Java
APIs: Stripe, Twilio, Shopify, OpenAI, AWS, Google Cloud.
Herramientas: Zapier, Make, Postman, Swagger, AWS API Gateway
Arquitectura: Microservicios, Serverless, MVC, Event-Driven

? Construyamos algo que dure
Necesitas un desarrollador senior que lo consiga?

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Construí aplicaciones web de alto rendimiento usando Java/Spring & React, optimizando APIs para manejar más de 5K solicitudes diarias. Rescaté un backend de comercio electrónico heredado, reduciendo la latencia en un 40% a través del ajuste de consultas y el almacenamiento en caché. Pipelines CI/CD automatizados, reduciendo el tiempo de despliegue en un 30%.

- Desarrollador Full-Stack | N-iX (2018.8 - 2020.4)
Diseñó APIs escalables en la nube (Node.js/PostgreSQL) para una integración de Shopify de 10K pedidos/día, mejorando la fiabilidad del checkout en un 90%. Lideré un equipo para modernizar un portal de salud, asegurando el cumplimiento de HIPAA a través de encriptación y registro de auditoría.

- Desarrollador Full-Stack | Directio (2020.7 - 2023.3)
Diseñé una plataforma de tecnología financiera Python/Django con integraciones Stripe/Twilio, procesando más de 2 millones de dólares en transacciones mensuales. Reducción de errores de API en un 60% a través de pruebas rigurosas y lógica de reintento. Mentor junior devs en las prácticas de codificación segura.

- Desarrollador Senior | Ingsoftware (2023.5 - 2024.11)
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