Projects behind the guides
These projects are where the site's strongest backend examples come from. The case studies separate implemented decisions from future improvements instead of presenting architecture diagrams as proof by themselves.
CryptoEx
A crypto-exchange backend project used to explore withdrawals, balance reservation, queue retries, idempotency, durable state, and auditability.
SentinelFi
A fraud-detection microservices project used to explore event contracts, Kafka and gRPC boundaries, replay-safe consumers, risk signals, review queues, and decision history.