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
“Translate technical complexity into business impact. Executives care about revenue, risk, and velocity, not architecture”
“Sustainable on-call rotations need a minimum of 6-8 people. Fewer than that and individuals end up on call too frequently, which leads to burnout and attrition”
The de facto open-source registry for ML models, datasets, and the Transformers library
Caps request rates to protect services from abuse, DDoS, and resource exhaustion
An SSTable (Sorted String Table) is an immutable, sorted file of key-value pairs with an index block for fast lookups. Immutability is the key design decision: writes never modify existing files, they create new ones. This makes writes fast and crash recovery simple