Alejandro Villamizar
Java Backend Engineer
Perfil profesional
Backend engineer with 7+ years building resilient , cloud-native backends using Java , Spring Boot , Kafka , and AWS for e-commerce , banking , and healthcare . Expert in microservices , event-driven design , and high-availability systems
Experiencia laboral
Built API-first integrations (REST/GraphQL + OAuth 2), applied CQRS, Dependency Injection, and documented architecture with ADRs. Ensured code quality with JUnit, Mockito, SonarQube (80% coverage).
Logro principalDesigned event-driven microservices with Spring Boot & Kafka, optimized PostgreSQL, and replaced monoliths with AWS Fargate services. Raised NPS by 15% and ensured 99.95% availability.
Handled 200k+ daily requests, automated CI/CD with GitHub Actions, mentored junior engineers, and reduced integration bugs by 40%.
Logro principalImproved DB performance 70% with Redis caching, built microservices with Spring Boot, Kafka, AWS, and unified REST services with GraphQL.
Produced technical specs, enforced testing with JUnit/Mockito, led on-call rotation, and maintained 99.9% uptime.
Logro principalDelivered features with Java EE, Spring Boot, React, and Oracle. Improved code quality from 70% to 92% and cut integration time by 40%.
Formación académica
Universidad de córdoba (co) | Profesional
