Mobile System Design

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Designing one installed app end to end: offline sync over a local store, paged feeds, media and push pipelines, and releases that cannot be recalled. Senior mobile loops run it as a separate round.

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Interview Playbookempty
- Requirements & Scopingempty
- Diagram & Deep Divesempty
Client Architectureempty
- Layering & Data Flowempty
- Feature Modularizationempty
- Navigation & Entry Pointsempty
- App Lifecycle & Restorationempty
Backend Contractempty
- Wire Protocol Choiceempty
- Supporting Old App Versionsempty
- Request Pipelineempty
- Server-Driven Screensempty
Offline-First & Syncempty
- Outbox & Queued Writesempty
- Optimistic State & Rollbackempty
- Write Conflictsempty
- Change Tokens & Tombstonesempty
Caching & Local Storageempty
- Memory & Disk Cachesempty
- Stale Data & Invalidationempty
- Persistent Store Choiceempty
- On-Device Migrationsempty
Infinite Feedsempty
- Cached Cursor Pagingempty
- Refresh, Merge & Gapsempty
- Virtualization & Diffingempty
Client Media Pipelinesempty
- Image Loading & Decodeempty
- Image Variants & Formatsempty
- Resumable Uploadsempty
- Feed Video Preload & Downloadsempty
Real-Time & Pushempty
- Live Transport Choiceempty
- Connection Lifecycleempty
- Notification Deliveryempty
- Chat Delivery Semanticsempty
Device Resource Budgetsempty
- Radio Energy & Data Costempty
- Background Time Limitsempty
- Launch Path & Cold Startempty
- Frame Time & Memoryempty
Release, Flags & Telemetryempty
- Store Rollout & Upgradesempty
- Kill Switches & Experimentsempty
- Crash & Hang Reportingempty
- Analytics Event Pipelineempty
Client Security & Privacyempty
- Secrets on Deviceempty
- Pinning & Attestationempty