System Design Problemset
110 deterministic distributed systems problems across 15 infrastructure domains
Architecture Mastery Telemetry
0 / 122,500 pts earned·0/110 AC
Featured Daily ChallengeHLD-408 · Expert (2000 pts)
Multi-Cluster LLM Prefix KV-Cache Router & Token SchedulerDesign an OpenAI / vLLM multi-cluster inference control plane that routes shared system-prompt prefixes to sticky KV-cache pools, enforces TPM quotas, and survives 8x storage/checkpoint brownouts.
Caching & Consistency · 7 Chaos & Skew Cases
| Status | Code | Question | Max Pts | Best | |
|---|---|---|---|---|---|
| — | HLD-201 | High-Throughput URL Shortener & Redirector | Medium | 1,000 | — |
| — | HLD-101 | Distributed API Rate Limiter & Quota Gateway | Easy | 500 | — |
| — | HLD-301 | Flash-Sale Concert Ticket Checkout | Hard | 1,500 | — |
| — | HLD-223 | Adaptive Bitrate Video Streaming & Edge Manifest CDN | Medium | 1,000 | — |
| — | HLD-102 | Pastebin & Ephemeral Text Snippet Store | Easy | 500 | — |
| — | HLD-402 | Global Real-Time Social Timeline Feed | Expert | 2,000 | — |
| — | HLD-202 | Product Catalog & Autocomplete Typeahead Search | Medium | 1,000 | — |
| — | HLD-310 | 1-on-1 & Small-Group E2EE Messaging, Offline Queue & Receipts | Hard | 1,500 | — |
| — | HLD-107 | Distributed 64-Bit ID & Sequence Service | Easy | 500 | — |
| — | HLD-221 | Online Coding Judge & Sandbox Execution Queue | Medium | 1,000 | — |
| — | HLD-319 | Global Card Payment Authorization & Idempotent Retry Engine | Hard | 1,500 | — |
| — | HLD-103 | Global Feature Flag & Dynamic Config Service | Easy | 500 | — |
| — | HLD-303 | Real-Time Ride-Hail Driver Location & Dispatch | Hard | 1,500 | — |
| — | HLD-401 | Low-Latency Equity Order Gateway & Risk Pre-Check | Expert | 2,000 | — |
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