Battle-tested backend & system design references — free with your email. Download once, keep forever.
Every core command, data structure and eviction policy on one printable page.
Topics, partitions, offsets, consumer groups and delivery guarantees, distilled.
Indexing, query plans and the joins that quietly kill your database.
The most-asked HLD questions with a one-line framework for each.
The full path — languages, databases, caching, queues, scaling, design.
REST, GraphQL, gRPC — versioning, pagination, errors and idempotency done right.
The 40 things to get right before you split the monolith — and after.
CQRS, SAGA, event sourcing, circuit breaker — when to use each, visualized.
The commands and manifests you actually reach for, side by side.
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