System Design
From URL shorteners to global feeds — designed end to end.
Deep-dives on cache, queue, replica, shard, and consistency tradeoffs. L4 to Staff+ scope, with real diagrams and capacity math.
- system design interview
- leetcode system design
- neetcode system design
- hackerrank system design
- scalability interview
- design twitter
Design a URL Shortener: IDs, Redirects, and Hot-Key Reality
From base62 counters to contention — a loop-friendly walkthrough with math you can say out loud.
- system design interview
- design url shortener
- scalability interview
Design a Chat System: Delivery Semantics and Presence at Scale
WebSockets, retries, and why exactly-once delivery is a myth you should not casually promise.
- system design interview
- chat system design
- messaging system design
Design a Distributed Cache: Eviction, Coherency, and Stampede Control
Memcached vs Redis patterns, single-flight, and what 'TTL' implies for your consistency story.
- system design interview
- distributed cache design
- redis interview
Design a Payment Ledger: Idempotency, Double-Entry, and Reconciliation
Financial correctness beats microservice fashion — start from invariants, not diagrams.
- system design interview
- payment system design
- ledger design
Design a News Feed: Fan-out, Ranking, and the Consistency Spectrum
Push vs pull, hybrid fan-out, and why 'real-time' is a product claim, not a default.
- system design interview
- design twitter
- news feed system design
Design a Video Streaming Platform: Encoding, CDN, and Playback QoS
Adaptive bitrate, segment storage, and DRM-adjacent concerns without Hollywood jargon.
- system design interview
- video streaming design
- cdn interview
Design a Distributed Rate Limiter: Tokens, Leaks, and Shared State
Edge vs service limits, approximate counters, and what breaks under Redis failover.
- system design interview
- rate limiter design
- distributed systems interview
Design Search Autocomplete: Tries, Ranking, and the Prefix Hotspot Problem
Latency budgets, personalization boundaries, and why caching prefixes is harder than it sounds.
- system design interview
- autocomplete system design
- search system design
System Design Interview Framework: The 7 Steps FAANG Loops Actually Score
Stop drawing boxes for forty-five minutes. Score the rubric the interviewer is filling out in real time.
- system design interview
- leetcode system design
- neetcode system design
- system design framework
Stop grinding. Start patterning.
Patterns-first interview prep — coding, design, behavioral, mocks, ML/AI in one $19/mo subscription.