Build Google Drive's File Sync Engine Premium
Design a file synchronization system that detects changes on any device, propagates them to all other devices within seconds, handles concurrent edits, and resolves conflicts without data loss.
Build a HIPAA-Compliant Tamper-Evident Audit Log Premium
Design an audit logging system for healthcare data where every record access and modification is logged immutably, the log itself cannot be altered without detection, and auditors can query it efficiently.
Build a Medical Record Deduplication System Premium
Design a patient identity matching system that detects and merges duplicate patient records across hospital systems using probabilistic matching, handles conflicting data fields in the merge, and provides a full audit trail of merges.
Build a Model Versioning and A/B Testing System for ML Premium
Design a model deployment system that safely rolls out new ML models alongside existing ones using traffic splitting, measures business metrics per model variant, and automatically rolls back when a new model underperforms.
Build a Multi-Agent Orchestration System with Shared Memory Premium
Design an orchestration layer where a planner agent decomposes a task, spawns specialized sub-agents in parallel, and coordinates their outputs through a shared memory store - with full observability into every agent's actions.
Build a Multi-Region Config Management System Premium
Design a configuration management system that propagates changes to 20 global regions in under 500ms, prevents config divergence between regions, and supports instant rollback when a bad config causes elevated error rates.
Build a Multi-Tenant Database System Premium
Design a database architecture that isolates tenant data, prevents noisy-neighbor query interference, and allows individual tenants to be migrated, backed up, or throttled independently - all on shared infrastructure.
Build a Real-Time Multiplayer Game State Sync System Premium
Design a game state synchronization system that keeps all players in a match consistent with sub-100ms latency, handles lag compensation so fast-network players don't have an unfair advantage, and recovers gracefully when a player disconnects.
Build a Payment Processing System with Idempotency Guarantees Premium
Design a payment system that safely retries failed transactions without double-charging users, handles partial failures across payment provider integrations, and maintains a consistent ledger under concurrent requests.
Build a Push Notification Routing System Premium
Design a notification dispatch system that routes messages across APNs, FCM, and Web Push, guarantees at-least-once delivery with deduplication, and handles delivery failures with smart retry strategies.