Title: System Design Interview Questions: 20 Most-Asked Problems | LeakCode
Open Graph Title: System Design Interview Questions: 20 Most-Asked Problems | LeakCode
X Title: System Design Interview Questions: 20 Most-Asked Problems | LeakCode
Description: The 20 most-asked system design interview questions ranked by frequency in LeakCode reports. Design Twitter, design Uber, design TinyURL, rate limiter, and more.
Open Graph Description: The 20 most-asked system design interview questions ranked by frequency in LeakCode reports. Design Twitter, design Uber, design TinyURL, rate limiter, and more.
X Description: The 20 most-asked system design interview questions ranked by frequency in LeakCode reports. Design Twitter, design Uber, design TinyURL, rate limiter, and more.
Opengraph URL: https://leakcode.dev/system-design
X: @leakcode
Domain: leakcode.dev
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| Design Twitter #1 How to design Twitter (X) for ~500M DAU with the fanout-on-write timeline pattern. Asked at: meta, amazon, google, uber, linkedin | https://leakcode.dev/system-design/design-twitter |
| Design Uber #2 Geospatial matching at scale: how Uber matches 100M+ riders to drivers in under 5 seconds. Asked at: uber, lyft, doordash, amazon, google | https://leakcode.dev/system-design/design-uber |
| Design TinyURL #3 The most common system design phone screen. Base62 encoding, key generation, and 100:1 read/write ratio. Asked at: amazon, google, meta, microsoft, stripe | https://leakcode.dev/system-design/design-tinyurl |
| Design Rate Limiter #4 Token bucket vs sliding window vs fixed window: which algorithm and how to make it distributed. Asked at: google, amazon, stripe, cloudflare, uber | https://leakcode.dev/system-design/design-rate-limiter |
| Design Parking Lot #5 The classic OOD/LLD interview question. State machine, allocation strategy, and concurrency in a 1000-spot lot. Asked at: amazon, google, meta, uber, lyft | https://leakcode.dev/system-design/design-parking-lot |
| Design Instagram #6 Photo storage, feed generation, Stories TTL, and the read-heavy 100:1 workload. Asked at: meta, amazon, google, snap, pinterest | https://leakcode.dev/system-design/design-instagram |
| Design WhatsApp #7 End-to-end encryption, message ordering, and presence at 2B-user scale. Asked at: meta, amazon, google, linkedin, slack | https://leakcode.dev/system-design/design-whatsapp |
| Design Netflix #8 Adaptive bitrate streaming, global CDN, and the recommendation pipeline. Asked at: amazon, google, meta, netflix, hulu | https://leakcode.dev/system-design/design-netflix |
| Design YouTube #9 Video upload, transcoding pipeline, and serving 1B+ hours/day. Asked at: google, amazon, meta, netflix, tiktok | https://leakcode.dev/system-design/design-youtube |
| Design Google Search #10 Inverted index, query understanding, and ranking 100B+ pages in under 200ms. Asked at: google, amazon, meta, microsoft, linkedin | https://leakcode.dev/system-design/design-google-search |
| Design Dropbox #11 File sync, deduplication, and delta-block uploads across 700M+ users. Asked at: amazon, google, meta, dropbox, microsoft | https://leakcode.dev/system-design/design-dropbox |
| Design Typeahead #12 Trie-based prefix matching, real-time popularity updates, and sub-50ms response. Asked at: google, amazon, meta, linkedin, doordash | https://leakcode.dev/system-design/design-typeahead |
| Design Web Crawler #13 Politeness, dedup, and the URL frontier for crawling 1B+ pages. Asked at: google, amazon, meta, microsoft, openai | https://leakcode.dev/system-design/design-web-crawler |
| Design Notification System #14 Multi-channel delivery, dedup, user preferences, and at-least-once guarantees. Asked at: amazon, google, meta, uber, stripe | https://leakcode.dev/system-design/design-notification-system |
| Design Distributed Cache #15 Consistent hashing, replication, eviction, and the thundering herd problem. Asked at: amazon, google, meta, uber, stripe | https://leakcode.dev/system-design/design-distributed-cache |
| Design Pastebin #16 Write-once read-many, TTL expiration, and similar to URL shortener with body storage. Asked at: amazon, google, meta, microsoft | https://leakcode.dev/system-design/design-pastebin |
| Design Stock Exchange #17 Order matching engine, fairness, and sub-millisecond latency requirements. Asked at: amazon, google, meta, stripe, robinhood | https://leakcode.dev/system-design/design-stock-exchange |
| Design Ride Hailing #18 Generalized rider-driver matching system. Often a variant of the Uber question. Asked at: uber, lyft, doordash, amazon | https://leakcode.dev/system-design/design-ride-hailing |
| Design Instagram Stories #19 24-hour TTL, view ordering, and seen-state per viewer for 500M+ DAU. Asked at: meta, snap, amazon, google | https://leakcode.dev/system-design/design-instagram-stories |
| Design Spotify #20 Audio streaming with low buffering, offline downloads, and the discovery algorithm. Asked at: amazon, google, meta, spotify, apple | https://leakcode.dev/system-design/design-spotify |
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