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Decouple services and handle long-running operations with event-driven architecture, using CloudEvents and Kafka for reliable, observable event flows.
Order created at 10:00. Order cancelled at 10:01. Your consumer processes them in reverse — cancellation arrives first, then creation "succeeds." The order is now in an invalid state. Event ordering bugs are subtle, expensive, and entirely avoidable.
Event sourcing for AI compliance: immutable audit trails, GDPR Article 22 compliance, replaying AI decisions, PII masking, and temporal queries for regulated industries.
Build production event-sourced systems. Learn append-only event stores, aggregate reconstruction, snapshots, projections, EventStoreDB vs Postgres, temporal queries, and schema evolution strategies.
Master read-after-write consistency, version vectors, causal consistency tokens, and UI patterns for systems where data is temporarily stale.