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ronybrand/README.md

🇧🇷 Ler em português

Rony Reinehr Brand

Senior Software Engineer, 23+ years, most of it full-stack. Based in São Paulo, Brazil.

Open to Senior Backend/Full-stack roles, remote or São Paulo.

Backend focus on Java/Spring Boot and microservices, with AI-assisted engineering as a deliberate daily practice, not an experiment: deterministic guards around LLM agents, red-team code review, architecture decisions logged as ADRs while they're made.

Worth a look:

  • Brazilian States AI Agent: an LLM agent with tool calling against a live production API, hardened against prompt injection and system-prompt leakage. Live demo.
  • Brazilian States: a legacy codebase from 2018, rebuilt on Java 25/Spring Boot 4.1 with full AWS ownership from scratch. 14 ADRs and 4 production bugs documented from first principles. Case study.
  • spring-order-api: event-driven order management with transactional outbox, CQRS, and consumer-driven contract tests.

Core: Java · Spring Boot · Microservices · REST/JWT/OAuth2 · AWS · Docker/Kubernetes · Kafka/RabbitMQ · CI/CD

Also: Angular · React · Node/NestJS · Python · C#/.NET · Terraform · Testcontainers

LinkedIn · ronybrand@gmail.com

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  1. estado-ai-agent estado-ai-agent Public

    Spring AI + Gemini agent for the Brazilian States project: answers questions via tool calling, with prompt-injection and leak guardrails

    Java 1

  2. estado estado Public

    Spring Boot REST API for the Brazilian States project: CRUD, JWT auth, rate limiting

    Java 1

  3. react_state react_state Public

    React frontend for the Estado project — CRUD for Brazilian states, JWT auth, TanStack Query

    TypeScript 1

  4. spring-order-api spring-order-api Public

    Order management API in Spring Boot: CQRS read-model, transactional outbox, RabbitMQ notifications, OAuth2/Keycloak, Pact contract tests

    Java 1