Backend Java Developer
More than three years building and maintaining backend services in Java and Spring Boot: REST APIs, SQL databases, deployments on Azure and Docker, integrations, performance optimization and production support.
Three years of backend work, mostly in Java and Spring Boot, across development, data integration and production support.
Every month I migrate more than 20,000 invoices from the contract-management system into accounting, with SQL ETL processes and the patience of checking that every record reconciles across databases before I call it done. The rest of the time I build new backend requirements in Java and Spring Boot.
Java, Spring Boot, SQL, ETL, Git
I automated moving invoices from PDF into Excel, a task that took two days of manual entry and dropped to five minutes, without the mistakes. With that time freed up, I built sales metrics in pandas so purchasing decisions could run on data.
Python, OCR, pandas
For three years I maintained and developed e-commerce REST APIs and reactive services on Azure: orders, products, customers and payments. I fixed a critical payment-gateway flow and cut downtime by 35%. I optimized endpoints that answered in six to ten seconds down to one or two, using pagination, DTO projections and indexing.
Java 8, Spring WebFlux, JPA/Hibernate, Azure, SQL
Selected work where I built the backend end to end, from the sensor to the database.
Thesis, UPC, 2025 – 2026
A system that rewards recycling. An ESP32 container detects and weighs the material, the backend validates the operation, and the user receives a reward as a real token on a blockchain.
Architecture
The ESP32 firmware publishes its sensor and session readings over MQTT. The Spring Boot API (Java 21, DDD, JWT) consumes and processes those messages, persists to PostgreSQL and integrates an ERC-20 token on Polygon through Web3j. The Flutter app talks to the API and handles the QR and reward experience. Everything runs on an Azure VM with Docker.
Stack
Java 21, Spring Boot, PostgreSQL, MQTT, Docker, Azure, JWT, DDD, Web3j, Polygon, Flutter, ESP32
Academic, UPC, 2024
An API for reserving parking spaces between private users.
Architecture
Security with Spring Security and JWT, the Profiles context refactored with Clean Architecture, and reads split from writes with CQRS. The logic is covered with tests in JUnit 5 and Mockito.
Academic, UPC, 2024
A platform that diagnoses the health of tomato crops from images.
Architecture
The Spring Boot backend orchestrates a Python vision model (Flask and TensorFlow) that classifies each image and returns diagnosis, anomaly and confidence level. The interface is Angular and everything is integrated with Docker.
Backend developer with more than three years of experience in Java and Spring Boot, building and maintaining APIs and services that stay stable under load.
I work close to architecture, production support and performance: separating domains clearly, diagnosing incidents and optimizing queries and services so they hold up under pressure.
whoami
Backend Java Developer
cat stack.txt
Java, Spring Boot, PostgreSQL, Docker, Azure
cat interests.txt
Microservices, Cloud, DevOps, IoT
status
Building reliable backend systems
Java, Spring Boot, REST APIs, reactive services and backend architecture.
You can write to me by email or use the form.