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Full system design prompts. Draw architecture, define APIs, model data, explain tradeoffs.
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51 challenges found
Identify what data to collect and estimate storage for a year of performance metrics logs.
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Notify waitlisted patients when appointments are cancelled and manage slot acceptance within a time window.
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Unlock with Pro →Design a distributed payment system for 125,000 arcade machines using proprietary game cards.
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Unlock with Pro →Design an architecture to minimize server costs for CPU-intensive character animation processing.
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Unlock with Pro →Optimize a scoring system for a competitive online game that struggles under peak load during events.
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Unlock with Pro →Critique a design that uses IP detection to serve local-language event listings and propose improvements.
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Unlock with Pro →File upload, preview, drag-and-drop processing, and local file system access.
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Real-time multi-user drawing surface using Canvas API with sync and undo.
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Unlock with Pro →Real-time messaging UI with typing indicators, read receipts, and optimistic sends.
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Unlock with Pro →Real-time multi-user text editor with live cursors, conflict resolution, and offline support.
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Unlock with Pro →Keep cart, auth state, and UI in sync across multiple browser tabs.
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Widget-based dashboard where users drag, resize, and reorder components with layout persistence.
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Unlock with Pro →Client-side encryption of notes using Web Crypto API so the server never sees plaintext.
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Unlock with Pro →Build a robust HTTP client with caching, deduplication, and retry using the Fetch API.
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Unlock with Pro →Pan-and-zoom infinite canvas with virtualized object rendering, selection, and real-time collaboration.
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Unlock with Pro →Reusable drag-and-drop file upload component with chunked uploads and retry.
Store finder with live GPS position, map rendering, and distance sorting.
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Local-first notes app using IndexedDB as the primary store with cloud backup.
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Virtualized feed with lazy loading using Intersection Observer API.
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Full-stack subscription SaaS for engineers practicing interview skills.
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Unlock with Pro →Full-stack app for tracking job applications, interviews, and offers.
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Real-time driver position tracking on a map with smooth interpolation and state management.
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Unlock with Pro →Step-based checkout with form validation, payment integration, and resilient state management.
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Unlock with Pro →Infinite-scroll feed with real-time post updates, likes, and virtualized rendering.
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Unlock with Pro →In-app notification bell, real-time toast queue, badge counts, and persistent notification history.
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Design APIs and backend architecture for multi-channel notifications.
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Unlock with Pro →Architecture for a PWA that works offline using Service Workers and caching strategies.
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Unlock with Pro →Masonry or fixed-grid image feed with virtualization, lazy loading, and a lightbox viewer.
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Frontend architecture for a live SaaS metrics dashboard.
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Unlock with Pro →Accessible autocomplete with debouncing, result caching, and keyboard navigation.
Persistent shopping cart with optimistic updates, offline support, and cross-tab sync.
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High-throughput URL shortening and redirect service at 1B redirects/month.
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Adaptive streaming video player with buffer states, quality selection, and accessibility.
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Unlock with Pro →Audio playback pipeline with waveform visualization using the Web Audio API.
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Unlock with Pro →Offload formula evaluation and large dataset processing to Web Workers.
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Unlock with Pro →Peer-to-peer video/audio calling UI using WebRTC, signaling server, and TURN.
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Unlock with Pro →Estimate resource costs and design a scalable architecture for a viral 1-minute video sharing app.
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Unlock with Pro →Identify problems with bytewise file comparison for deduplication and propose efficient alternatives.
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Unlock with Pro →Scalable leaderboard supporting score submissions, top-100 queries, and per-player rank lookups.
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Estimate server count needed for storage and CPU load for an internal paste-sharing tool.
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Detect user country via IP and serve localized news — identify problems and improvements.
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Design a scalable prepaid-card payment system for 150,000 interactive kiosks worldwide.
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Unlock with Pro →Diagnose slowdowns in a nutrition tracking app that surged in popularity and propose scalability improvements.
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Unlock with Pro →Evaluate the tradeoffs of single-server vs multi-server architecture for a playlist streaming service.
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Identify issues with common password rules and propose a more effective validation strategy.
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Evaluate the advantages and disadvantages of a multi-server architecture for a topic-categorized podcast streaming platform.
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Diagnose performance issues and design a scalable architecture for a recipe app exploding in popularity.
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Unlock with Pro →Identify what data to collect and estimate storage requirements for a year of search query logs.
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Identify key considerations when porting smart appliance functionality from a networked computer to a low-cost embedded microcontroller.
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Unlock with Pro →Redesign a sports statistics platform to minimize the impact of unreliable third-party data API outages.
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Unlock with Pro →Build a pipeline to A/B test video frames and automatically select optimal thumbnails.
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