public class PauloUchoa extends Developer {

    String role        = "Full-Stack Developer (Java + Angular)";
    String location    = "São Paulo, SP 🇧🇷";
    String[] focus     = { "RESTful APIs", "Full-Stack Web Apps", "Event-Driven / Messaging" };
    String[] learning  = { "Cloud (AWS/GCP)", "Docker & Kubernetes", "DevOps" };

    @Override
    public String toString() {
        return "Passionate about clean code and solving real problems.";
    }
}

A full-stack app to organize personal finances: accounts, categories, transactions, monthly budgets and visual reports.

• What it does: JWT authentication (register/login), CRUD for accounts and categories, income/expense entries with filters and pagination, per-category budgets tracking spent vs. limit, and income × expense reports with a per-category chart.
• Backend: Java 17 · Spring Boot 3 · Spring Security (JWT) · JPA/Hibernate · PostgreSQL · Flyway · OpenAPI/Swagger
• Frontend: Angular · TypeScript · RxJS + Signals
• Engineering: automated tests (JUnit 5, Mockito, Testcontainers), Docker Compose (database + API + web) and GitHub Actions CI

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A security-focused authentication service: tokens live in HttpOnly cookies (never exposed to JavaScript), not localStorage.

• What it does: short-lived JWT access token + rotating refresh token with reuse detection — replaying a stolen token revokes the whole token family. Plus CSRF double-submit, brute-force lockout, Argon2id hashing, security headers and an audit trail.
• Backend: Java 17 · Spring Boot 3 · Spring Security 6 · JWT · Argon2id · PostgreSQL · Flyway
• Frontend: Angular 21 (cookie flow, CSRF + transparent token-refresh interceptors)
• Engineering: unit, MockMvc and Testcontainers tests; Docker Compose and GitHub Actions CI

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An asynchronous notification service built around RabbitMQ. A REST API accepts requests and delivers them in the background through per-channel workers (email, SMS, push).

• What it does: per-channel routing, retries with exponential backoff, a dead-letter queue for exhausted messages, idempotent consumers, and full delivery-status tracking (PENDING → SENT / FAILED / DEAD).
• Stack: Java 17 · Spring Boot 3 · RabbitMQ / Spring AMQP · PostgreSQL · Flyway · OpenAPI/Swagger
• Engineering: integration tests with Testcontainers (real RabbitMQ + Postgres), Docker Compose and GitHub Actions CI

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A REST API for managing car dealerships, with role-based access (admin, owner, manager, assistant) and automatic assignment of sales opportunities based on assistant workload.

• Stack: Java 17 · Spring Boot 3 · Spring Security (JWT) · JPA/Hibernate · Swagger · Docker
• Highlights: layered permission checks (@PreAuthorize + business rules) and a fair lead-distribution algorithm

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🔨  Building full-stack apps with Spring Boot & Angular
📨  Exploring event-driven systems with RabbitMQ
🧪  Writing well-tested code (JUnit, Mockito, Testcontainers)
🌱  Studying cloud & containerization (Docker, AWS)