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10 strategies, stampede, invalidation + 14 interview questions.
URL → DNS → TCP → TLS → HTTP, HTTP/2 vs 3, proxies & CDNs.
B+tree indexes, ACID, isolation levels, replication vs sharding.
L4 vs L7, every algorithm, health checks, sticky sessions, GSLB.
Sessions vs JWT, OAuth 2.0, password hashing, 401 vs 403.
REST vs GraphQL vs gRPC, idempotency, versioning, pagination.
Monolith vs micro, saga, circuit breaker, API gateway, discovery.
CAP (correctly), PACELC, consistency, vertical vs horizontal.
Partitions, consumer groups, delivery guarantees, DLQ, Kafka vs RabbitMQ.
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