Hellyson Dantas

Senior Java Full Stack Developer Java, Spring Boot, Quarkus Reactjs, Typescript @CASSI

Led development teams and designed technical solutions such as secure and scalable REST APIs and Gateways built with Java (versions 8, 11, 17) using Spring Framework and Quarkus, following SOLID, CLEAN ARCH, KISS, and DRY principles, along with Oracle and MongoDB databases using JPA/Hibernate with and TDD(JUnit, Mockito).• Built an OAuth2 Authorization Server (Spring Security) used by users.• Developed an asynchronous messaging system using event-driven Kafka, WebSocket, and Spring Stomp, actively used by users and monitored with Grafana and Prometheus.• Worked with Spring Security, Spring Authorization Server, OAuth2, and Keycloak to ensure API security.• Used Docker and Kubernetes for containerization and microservices deployment in CI/CD pipelines on Azure DevOps.• Developed front ends using ReactJS, TypeScript, and Vite.