Backend developer focused on building secure, scalable and well-structured REST APIs using Java and Spring Boot. I care deeply about clean architecture, separation of concerns and applying industry best practices from day one.

Currently deepening expertise in Spring Security, JWT authentication and stateless API design.

• 🎯 Goal: Become a professional backend engineer ready for production-grade systems
• 🔐 Interested in API security, authentication flows and fraud prevention
• ⚙️ Strong focus on architecture, code organization and scalability
• 📍 Brazil

Secure authentication API with JWT, Spring Security and fraud prevention mechanisms.

• Stateless JWT authentication with JwtAuthenticationFilter
• Route protection via SecurityFilterChain
• BCrypt password hashing + UserDetailsService integration
• Login attempt tracking with automatic account blocking
• Suspicious IP detection and user status control (ACTIVE, BLOCKED, UNDER_REVIEW)
• Global exception handling with standardized responses

RESTful API for donation management built with professional backend practices.

• Full CRUD with filtering by type and status updates
• DTO pattern for data protection and decoupling
• Jakarta Validation + global exception handling (@ControllerAdvice)
• Layered architecture: Controller → Service → Repository
• PostgreSQL persistence

Spring Security  ████████████░░░  Advanced filter chain & roles
JWT Auth         ████████████░░░  Refresh tokens & token rotation
Testing          ███████░░░░░░░░  JUnit 5 + Mockito
Docker           █████░░░░░░░░░░  Containerizing Spring Boot apps

• Clean Architecture → clear separation between layers
• Security First → authentication and validation from day one
• Meaningful Commits → Conventional Commits standard (feat:, fix:, docs:)
• RESTful Design → proper HTTP verbs, status codes and response bodies
• Readable Code → code that communicates intent without needing comments