Core Patterns • October 7, 2023 • 4 min read
Idempotency — A Practical Guide for Backend Engineers
Why every non-trivial backend needs idempotency keys, the common designs, and the mistakes that let duplicates slip through anyway.
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Core Patterns
Core Patterns • June 21, 2023 • 5 min read
Transactional Outbox — The Pattern, End to End
Why "save to DB, then publish to Kafka" is almost always wrong, and the outbox pattern that fixes it — with real Java code, schema, and production considerations.
Core Patterns • March 9, 2023 • 4 min read
Saga Patterns Explained — Transactions Without Transactions
How to coordinate operations across services that each have their own database. Orchestrated vs choreographed sagas, compensating actions, and when to use which.
Core Patterns • October 27, 2022 • 5 min read
Event Sourcing in Practice — Lessons From Shipping It
The things nobody tells you about event sourcing until you've run it in production — snapshot strategies, schema evolution, event stream hygiene, and when to walk away.
Core Patterns • June 15, 2022 • 4 min read
Event Sourcing — The Basics
Storing events instead of state — what it is, what it buys you, and the situations where the complexity is worth the audit trail and replayability.
Core Patterns • March 22, 2022 • 4 min read
CQRS Deep Dive — Reads and Writes Don't Have to Be the Same
Command Query Responsibility Segregation explained from first principles — the problem it solves, when it's overkill, and what it looks like in real Java systems.