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bbg

11 notes·3h to read

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Mobile System Design InterviewsA one-hour, deliberately open-ended conversation where clarifying the problem matters more than any single "right" answer — and where the bar rises sharply with seniority.9m
Mobile System Design, A 5 Step Interview FrameworkFive ordered steps turn an open-ended prompt into a controlled, 45-minute conversation, so neither you nor the interviewer gets lost.8m
Designing a Mobile News Feed AppAn offline-capable, infinitely scrolling feed for 500M users — built one problem at a time.21m
Design a 1:1 Chat AppA real-time, offline-capable messaging client for 30M daily users — a local-first database reconciling with a store-and-forward relay over two channels.20m
Design a Mobile Stock Trading AppGetting fast-moving prices onto a phone, reliably and safely — where a few seconds of lag can cost a user real money.15m
Design a Reusable Pagination LibraryThe hard part isn't paging data — it's building an API other developers will happily adopt, extend, and depend on for years.15m
Design a Hotel Reservation AppSearch, hold, and pay for a room from a phone — where the interesting problems are a countdown clock you can't trust and a payment you can't fumble.13m
Design a Google Drive Mobile ClientStoring, syncing, and versioning files from a phone — where a 10 GB upload has to survive a dropped signal and a locked screen.12m
Design a YouTube Mobile ClientGetting video to start fast and never stall — on a billion phones, across every network from fiber to one flickering bar.12m
Mobile System Design Building BlocksThe architecture, storage, networking and delivery patterns you reach for again and again — and the trade-offs that decide between them.35m
Quick Reference Cheat SheetEvery consideration worth raising in a mobile design interview, grouped by domain — a scannable prompt sheet, not a checklist to recite.5m