Esteban
Full Stack | Backend Developer, Santa Fe, Santa Fe, Argentina
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Argentina
- Grabar
Argentina Full-stack developer with 6+ years of experience building and operating production systems: backend in Java/Spring Boot, Node.js/NestJS, and C#/.NET (legacy maintenance and modernization); frontend in React, Angular, and Next.js. Designed and maintained microservices for tax platforms (more than 100,000 taxpayers), banking, and e-commerce, with production releases covered by automated tests. Real AWS experience (S3 integrations), AI integration in products (OpenAI), and daily AI-assisted development with coding agents. Mentor and code reviewer in Agile (Scrum) teams, working remotely with distributed teams for years.
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Hacer consultaExperiencia / Trabajos Anteriores
Full-Stack Developer
- Built backend microservices (Java/Spring Boot) and frontend (React) for the tax-management system of Misiones province (platform serving more than 100,000 taxpayers). Project-based contract, concluded when the development phase closed.
- Tax-returns module migration: redesigned a denormalized 8-table Oracle schema as a normalized inheritance model for the new PostgreSQL database, cutting declaration query times from ∼5 s to 2–3 s.
- Built the tax-interest calculation module: high-complexity fiscal logic with validations, reaching 100% test coverage over all known case combinations.
- Contributed to microservices architecture design, code reviews, and team mentoring.
Full-Stack Developer
- Full-stack delivery for multiple clients: airline HR role-assignment system (Java/Spring Boot, MongoDB, React frontend), a sports-trivia web app (Java 21 REST API + PostgreSQL, Next.js frontend, deployed on Heroku and now commercialized by the client), and NestJS backends (TypeScript) with OAuth authentication.
- Legacy .NET work: maintained a production .NET 4.8 banking payment system (business-rule adjustments for company-payment identification via barcode and verification against the processed-payments database) and delivered new features for a cruise-line signage module (.NET 4.5 + AngularJS).
- AWS S3 storage integration in a client project; deployments with Docker and CI/CD pipelines with GitHub Actions.
- Designed and shipped an AI assistant (OpenAI, Python) for project management, adopted by 100% of its users (2 teams, 20 people) until the project closed.
- Technical mentoring and code reviews, working autonomously in Agile teams.
Backend Developer (Freelance)
- Complete membership management system for the Club Deportivo y Náutico Azopardo (end client, 700 members): activity enrollment, hall rental, family groups with discounts, and quota control with automatic lapse for nonpayment.
- Domain-sensitive business rules: member age-of-majority checks with email notices and due-quota notifications; Mercado Pago payment integration (checkout and receipt issuance) and administration with 3 distinct roles. Stack: NestJS (TypeScript) + PostgreSQL, deployed with Docker and CI/CD with GitHub Actions.
Full-Stack Developer
- Invoicing microservice for an enterprise e-commerce platform (Java/Spring Boot, Magento integration): migrated issued-invoice storage from a self-managed server to AWS S3, eliminating dedicated infrastructure and gaining scalability, availability, and disaster recovery.
- Start of the platform migration to a hexagonal architecture (ports and adapters), with asynchronous inter-service communication over a Kafka event bus; React frontend features.
Java Developer
- Tax-calculation module for checking accounts in a production banking system (Java/Spring): Strategy pattern to run different rule schemes by customer type.
Full-Stack Developer
- Maintained and extended a production Magento 2 e-commerce platform.
Development Analyst
- Business rules for the BRMS of DIRECTV Argentina’s national prepaid-TV system (Java + Drools), moving logic into a rules scheme and automating test scenarios with Cucumber.