8 milestones Order + Payment

Mỗi milestone kết thúc bằng executable gate, ADR và failure evidence; không bắt đầu milestone sau nếu invariant trước chưa được test.

Lab 01 · Requirement và architecture baseline

Viết functional/non-functional scope, invariants, workload/SLO/RPO/RTO, C4/sequence/state diagrams, threat/failure map và ADR service boundary. Gate: 10-minute review chịu được challenge.

Lab 02 · Reproducible repository

Spring Boot modules, PostgreSQL, migrations, Compose/Testcontainers, one-command build/test, CI reports và dependency pinning. Gate: clean machine path không secret/manual DB step.

Lab 03 · Order + Payment correctness

Order state machine/API/optimistic locking; payment idempotency persisted. Test concurrent duplicates, stale transition, timeout-after-commit và mismatched key payload. Gate: one effect/invariant audit.

Lab 04 · Synchronous failure handling

WebClient/HTTP client phase timeouts, bounded retry/backoff+jitter, circuit/bulkhead và PAYMENT_UNKNOWN reconciliation. Inject latency/errors/pool saturation; gate bằng traffic amplification và recovery evidence.

Lab 05 · Async saga và outbox

Kafka hoặc RabbitMQ, versioned events, transactional outbox/relay, consumer inbox/idempotency, saga states, DLQ/replay. Kill producer/consumer tại commit boundaries; gate: convergence without duplicate effect.

Lab 06 · Data evolution và recovery

Expand-contract migration + checkpointed backfill dưới load; backup/PITR hoặc restore simulation, reconcile DB/broker/provider. Gate: mixed-version compatibility, RPO/RTO và discrepancy report.

Lab 07 · Platform, delivery và production controls

Non-root multi-stage images, SBOM/scan/sign, Compose và Kubernetes resources/probes/graceful shutdown; promote digest/canary. Thêm authz/secrets, OTel metrics/logs/traces, SLO alerts/runbooks.

Lab 08 · Game day và mock interview

Chạy duplicate/timeout/bad deploy/queue lag incident với roles/timeline/postmortem; demo failure-recovery. Thực hiện hai mock: architecture deep dive và production debugging, chấm rubric/gaps.

Rubric