Build a practical test strategy for Spring Boot microservices with fast domain tests, PostgreSQL and Kafka integration tests, message-contract checks, deterministic asynchronous assertions, and a small set of end-to-end flows.
Run Spring Boot services on Istio 1.30 with an ambient data plane, waypoint-based Layer 7 routing, Kubernetes Gateway API canaries, strict mTLS, workload authorization, and application-level trace propagation.
Apply strategic and tactical DDD without equating every bounded context with a microservice: model subdomains, define context boundaries, enforce aggregate invariants with JPA, and publish durable integration events through an outbox.
Define a measurable convergence contract for event-driven Spring Boot services, protect projections from duplicate and stale events, provide read-your-writes behavior, reconcile durable state, and repair drift safely.
Choose Redis data structures deliberately in Spring Boot, implement atomic sliding-window rate limits, recover Redis Stream consumers, share web sessions, build leaderboards and approximate counters, and operate Redis without turning it into an accidental source of truth.