Build an AI Agent Task Queue with Resumability Premium
Design an agent execution framework that handles long-running tool calls, persists agent state so tasks can be paused and resumed across server restarts, enforces token and cost caps, and supports parallel sub-agent execution.
Build Amazon's Product Search Ranking Premium
Design a search ranking system that incorporates real-time inventory, pricing, and sales velocity signals into results, personalizes rankings per user, and re-indexes a product catalog of 500 million items.
Build Amazon's Review Aggregation Pipeline Premium
Design a review processing pipeline that deduplicates submissions, filters fraudulent reviews using behavioral signals, computes rolling star averages, and surfaces the most helpful reviews per product.
Build a Bot Detection System Using Behavioral Signals Premium
Design a bot detection system that distinguishes human users from automated bots using behavioral and network signals, works without user-visible challenges, and updates its models as bots adapt their behavior.
Build a Concurrent Device Session Manager Premium
Design a session enforcement system that limits streaming to N concurrent devices per subscription plan, kicks the oldest session when the limit is exceeded, and works correctly across distributed servers.
Build a Distributed Cron Job Scheduler Premium
Design a cron scheduler that guarantees exactly-once execution of jobs across a cluster of nodes, handles missed executions during downtime, and scales to millions of scheduled tasks.
Build a Distributed Inventory Reservation System Premium
Design an inventory system that prevents overselling across 50 regional warehouses, reserves stock for a checkout session with a TTL, and releases reservations automatically if payment is not completed.
Build a Distributed Lock Manager and Leader Election Service Premium
Design a distributed coordination service that provides mutual exclusion across a cluster, implements lease-based locks that expire on node failure, and enables leader election for singleton workloads.
Build a Distributed Rate Limiter Across 100+ API Gateway Nodes Premium
Design a rate limiter that enforces per-user and per-tenant request limits globally across a horizontally scaled API gateway fleet, with no single coordinator bottleneck and sub-milliseclient enforcement latency.
Build a Distributed Shopping Cart with Guest Session Merge Premium
Design a shopping cart system that persists items for guest users, merges the guest cart into the authenticated cart on sign-in, handles concurrent modifications, and survives server restarts.