Traffic and reliability

Moving requests through a system without losing or repeating work: load balancing, rate limiting, queues and idempotency.

Oct 3, 2026api
API gateway for system design interviews
API gateway for system design interviews. The jobs the hop is good at, what must stay behind it, and a chat or feed that needs one.
Oct 3, 2026messaging
Backpressure in system design interviews
Backpressure in system design interviews. Slow consumers, bounded queues, drop versus block, and how you apply it across a network hop.
Oct 3, 2026availability
Circuit breaker pattern for interviews
Circuit breaker pattern for interviews. Closed, open, and half-open, what trips the breaker, honest fallback, and where it lives next to retries.
Oct 3, 2026networking
Reverse proxy for system design interviews
Reverse proxy for system design interviews. TLS, buffering, caching, and the mistakes that turn the hop into a bottleneck.
Oct 2, 2026fundamentalsdesigns
Idempotency keys in system design
Idempotency keys in system design. How a client retries a payment or a create without doubling the effect, and where the key has to be stored.
Oct 2, 2026fundamentalsdistributed-systems
Load balancing for system design interviews
Load balancing for system design interviews. Round robin, least connections, and consistent hashing, and when layer 4 and layer 7 change the answer.
Oct 2, 2026fundamentalsdistributed-systems
Message queues for system design interviews
Message queues for system design interviews. What a queue is for, how it differs from a log, and which delivery guarantee you should claim.
Oct 2, 2026fundamentalsdesigns
Rate limiting for system design interviews
Rate limiting for system design interviews. Token bucket, leaky bucket, and fixed windows, plus how a limit stays correct across more than one server.