Worked as a Backend Software Engineer developing and maintaining applications with Ruby on Rails and Java/Spring Boot. Developed REST APIs, integrated external services, designed and optimized database schemas, and worked with PostgreSQL, MySQL, and SQL Server. Participated in performance optimization initiatives involving SQL queries, JPA, and N+1 problems, significantly improving API response times and report generation. Worked on SaaS platforms used by multiple clients in production, as well as mobile and web applications. Integrated Mercado Pago payment services and developed backend services consumed by Angular and Ionic applications. Also worked with Docker and AWS infrastructure, including deploying and operating Ruby on Rails applications in production. Collaborated with frontend and DevOps teams through code reviews, technical discussions, API integration, and troubleshooting of production issues. Participated in the migration of legacy PHP applications to Ruby on Rails, contributing to architectural improvements and reducing technical debt.