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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?

? Invítame a tu trabajo-respondo en menos de 2 horas.","rawText":"Construyendo Aplicaciones Web Escalables y Automatizaciones Inteligentes | 10+ Años de Experiencia 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? ? Invítame a tu trabajo-respondo en menos de 2 horas.","canEdit":false,"editUrl":"https://www.workana.com/freelancer/9dd0dca01bd5cd5e343f0d66e0ee7563/profile/description","g11n":{"edit":"Editar","save":"Guardar","cancel":"Cancelar","warning":"Cuidado: No compartas datos de contacto o podrás ser bloqueado.","expandText":"Ver más detalles","collapseText":"retraer","placeholder":"Sintentiza en pocas palabras aquello que mejor te define como profesional. Muestra al mundo lo que puedes brindar para darle dirección a tu carrera freelance. Ej: Diseñador de imagen y sonido especialista en videos institucionales y retoque fotográfico"},"validation":{"required":true,"min":20}},"history":{"section":"history","title":"Historia laboral","dangerouslyWillBeRenderAsHtml_text":"- Ingeniero de Software | Software Mind (2017.7 - 2018.6)
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)
Dirigí microservicios impulsados por IA (NestJS/Kubernetes) para un cliente de comercio electrónico, aumentando las ventas en un 15% a través de recomendaciones personalizadas. Automatización de más de 500 horas/año de flujos de trabajo manuales mediante scripts personalizados. Renovación de un monolito frágil en servicios modulares, reduciendo las interrupciones en un 70%.","rawText":"- Ingeniero de Software | Software Mind (2017.7 - 2018.6) 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) Dirigí microservicios impulsados por IA (NestJS/Kubernetes) para un cliente de comercio electrónico, aumentando las ventas en un 15% a través de recomendaciones personalizadas. Automatización de más de 500 horas/año de flujos de trabajo manuales mediante scripts personalizados. Renovación de un monolito frágil en servicios modulares, reduciendo las interrupciones en un 70%.","canEdit":false,"editUrl":"https://www.workana.com/freelancer/9dd0dca01bd5cd5e343f0d66e0ee7563/profile/history","g11n":{"edit":"Editar","save":"Guardar","cancel":"Cancelar","warning":"Cuidado: No compartas datos de contacto o podrás ser bloqueado.","expandText":"Ver más detalles","collapseText":"retraer","placeholder":"Describe tus tareas en proyectos anteriores, tu rol y valor agregado para cada hito de tu carrera profesional. Cuéntanos cómo tu trabajo le dio valor a cada proyecto en los que hayas colaborado a lo largo del tiempo. Elige lo aspectos más relevantes de cada posición, qué aprendiste y qué lograste, y todo lo que ayude a entender el camino de tu historia profesional."},"validation":{"required":true,"min":20,"max":50000}}},"profileCompleteness":{"show":false},"newProfileCard":{"canEditCompany":false,"canAddFavorite":false,"addFreelancersDropdownTitle":"Agregar a lista","isHero":true,"isVerifiedAgency":false,"companyVisibleName":"Stefan","companyId":11517702,"companyHash":"9dd0dca01bd5cd5e343f0d66e0ee7563","ratingData":{"rating":4.71,"hasRating":true,"width":"width: 94.20%","noRatings":"Ninguna calificación todavía","average":4.71,"ratingText":"4.71 de 5.00"},"profileVisibilityEditInitials":{"isChecked":true,"actionUrl":"https://www.workana.com/companies/profile/edit/visibility","g11n":{"toggleLabel":"Perfil público"}},"agencyEditInitials":{"isChecked":false,"actionUrl":"https://www.workana.com/companies/profile/edit/is_agency","g11n":{"toggleLabel":"Perfil de Agencia"}},"phone":{"text":"Número de teléfono:","canEditPhone":false,"hasPhone":true,"number":null},"countryData":{"country":"RS","name":"Serbia","class":"flag flag-rs","url":"https://www.workana.com/es/freelancers/serbia?ref=freelancer_view","blankGif":"https://cf.wkncdn.com/static/assets/build/img/blank.4f4e80a62.gif"},"hourlyRate":{"text":"Valor hora:","rate":"USD 40,00","isSet":true,"currency":"USD","amount":"40.00"},"mainSkill":{"isSet":true,"text":"Freelancer experto en Programación y Tecnología"},"public":true,"clarificationText":"Formatos permitidos:
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