Architecture

A service slows down, every client retries, and the retries become the load that finishes it off. How retry storms form, why jitter matters more than backoff, and why retry budgets beat per-request limits.

Silo, bridge, or pool? Compare multi-tenant data isolation models on blast radius, cost, and operational load. Learn PostgreSQL row-level security, safe tenant context propagation, noisy-neighbour control, and how to migrate between models later.

How idempotency keys turn at-least-once delivery into safe, exactly-once API behavior, with request fingerprinting, response replay, and concurrency handling in Java and SQL.

Production patterns for eventual consistency in event-driven microservices: outbox, idempotency, sagas, schema evolution, and staleness UX.

A pragmatic Spring Boot implementation of hexagonal architecture with primary and secondary ports, module layout, and testing strategies that scale.

Practical guide to implementing Event Sourcing and CQRS in production systems. Covers event stores, read projections, snapshots, and honest trade-off analysis.

Master cell-based architecture patterns for fault isolation in distributed systems. Covers cell routing, blast radius containment, and real-world deployment strategies.

Complete guide to feature flag architecture — flag types, targeting rules, progressive rollouts, kill switches, and managing feature flag technical debt.

Step-by-step guide to the strangler fig pattern for monolith to microservices migration with routing strategies, data extraction, and rollback techniques.