Paulo-Marcos-Lucio/pix-automatico-reference

This is one of the most mature reference repos in the batch. pix-automatico-reference is not just a demo API; it presents a full production-style architecture for Pix Automático and Open Finance Brasil using Spring Boot 4, Java 21, PostgreSQL, Redis, Kafka, Flyway, Resilience4j, OpenTelemetry, Prometheus, Loki, Grafana, React, TypeScript, Tailwind, and a bundled operational dashboard. The README is detailed and persuasive: it covers hexagonal architecture, domain aggregates, idempotency, outbox, saga orchestration, observability, FAPI/DPoP, Testcontainers, ArchUnit, Pact, ADRs, OpenAPI docs, and useful Makefile targets. The pom.xml also supports the claims with real dependencies for security, OAuth2, Kafka, Redis, JPA, Flyway, observability, testing, and frontend build integration. Simulating usage, make up && make run should give a reviewer a complete local regulatory integration lab with API, UI, Kafka UI, Grafana, Prometheus, and traces. The only caution is that the README is very assertive in its production language; pairing it with screenshots, sample request flows, and a concise “what is simulated vs real BCB integration” section would make it even clearer. This is a strong portfolio-grade engineering repo.