Best Free System Design Resources to Learn in 2026
Curated, ranked guide to the best free system design videos, books, and labs in 2026 — what each teaches and how to sequence them.
Idempotent API Design: The Complete Engineering Guide
Idempotency keys, conditional requests, dedup stores, and natural idempotent operations — the production blueprint for safely retryable APIs in 2026 at scale.
Azure Cosmos DB Consistency Levels Explained: Strong, Bounded, Session, Eventual
Cosmos DB's 5 consistency levels — Strong, Bounded Staleness, Session, Consistent Prefix, Eventual. Latency, throughput, and when to use each.