System design concepts that show up in every system design interview. From CAP to consistent hashing - what it is, when it bites, how to talk about it.
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8 concept videos covering the database knowledge that interviewers actually probe: indexes, query plans, isolation, replication, sharding.
Versioning, idempotency, error contracts, rate limits - and the API ergonomics interviewers grade you on.
Quorums, Paxos/Raft intuitions, vector clocks, gossip - the building blocks behind every distributed system question.
Web vitals, render-blocking resources, hydration cost, image strategy - the levers that move real Lighthouse scores.
Session vs JWT tradeoffs, OAuth2/OIDC flows, refresh strategies, and the most common security footguns to talk about.
Now that the concepts are fresh, drill the questions that interviewers actually ask. Free preview on every question; Pro unlocks the full library.
