Esteban Nicolás Diaczun

Backend developer with 3+ years in healthcare systems: integrations with insurers and public health agencies, electronic medical records, scheduling and billing. I work across several stacks (Laravel, NestJS, .NET, Python) and own both design and production operation. I use AI daily and have built a product on top of it.

Remote · Laravel, Node.js, SQL Server, MySQL, WebSockets, Azure

• Tech lead for e-prescription integrations: built connectors from scratch with five providers (OSDE, Farmalink, Preserfar, Admifarm) and the Health Ministry (MSAL Bus: PUCO, SISA). Thousands of prescriptions a day.
• Led the patient app sold to clinic networks: backend from scratch and HIS modules adapted for mobile. One client has 3,000+ active users.
• HIS modules: patient and practitioner portals, scheduling, medical records, billing, and gradual migration from legacy (vanilla PHP, PowerBuilder) to Laravel.
• Real-time web queue caller with WebSockets for appointments and waiting rooms at healthcare centers.
• Advanced SQL Server: stored procedures, views and functions for medical data processing.

Remote · .NET 6, C#, Entity Framework, PostgreSQL, Angular, xUnit

• REST APIs in .NET 6 with Entity Framework and PostgreSQL, MVC architecture, xUnit tests and an Angular frontend.

Remote · Python, FastAPI, Selenium, AWS (S3, RDS), Scrum

• Web scraping for the pharmaceutical industry with FastAPI and Selenium, storage on AWS.

clara.net.ar · NestJS, Next.js, Prisma, PostgreSQL, Redis, Docker, Claude API

• Multi-tenant SaaS: a conversational assistant that serves patients over WhatsApp, books appointments and integrates with the clinic's system; a back office to manage organizations, schedules and plans.
• Full design, development and operations: monorepo, queues, Docker deployment on a VPS, monitoring and backups.

• Programming Technical Degree — since 2025.
• BSc in Systems Analysis, Instituto Superior N.º 24 — two years completed.
• C# & .NET bootcamp (OpenBootcamp) · Python & Django (Coderhouse).

• Languages & frameworks: PHP, Laravel, JavaScript, TypeScript, Node.js, NestJS, Express, Python, Django, FastAPI, C#, .NET, Go.
• Databases: SQL Server, T-SQL, MySQL, PostgreSQL, MongoDB, Redis.
• AI: Claude API, OpenAI, tool calling, WhatsApp bots (Twilio, Meta).
• Async: RabbitMQ, event-driven architecture, WebSockets, queues.
• Infrastructure: Docker, Git, GitHub, GitLab, Bitbucket, AWS (EC2, S3, RDS, DynamoDB), Azure.
• Architecture: Clean Code, SOLID, DDD, REST APIs, multi-tenant systems.

• Spanish: native. English: B2.