Algorithm patterns & code templates
End-to-end architecture problems
Design patterns & practical code
Deep dives into core tech
Production systems & operations
TCP, HTTP, TLS, DNS & more
Consensus, replication & more
Kernel, networking & system calls
Quick reference cards for interviews
“Run health checks quarterly with consistent metrics so you can spot trends, not just snapshots”
“Severity levels (SEV1-SEV4) give everyone a shared vocabulary and set expectations for response urgency. Without clear definitions, every incident either feels like an emergency or gets shrugged off”
Specialized databases for storing, indexing, and querying high-dimensional vector embeddings at scale
Stores unstructured data (files, images, logs, backups) as objects with metadata in flat namespaces
Raft decomposes consensus into three relatively independent sub-problems: leader election, log replication, and safety. Each one is tractable on its own, which is the whole reason Raft succeeded where Paxos confused everyone