Pattern series
Rate Limiting / Quota
8 System Design questions share this exact tag. Use the closely related series below for a fuller drill.
- 01Preview
AI Agent System
Design a production AI agent application platform that accepts user goals, manages context and memory, calls tools safely, pauses for human review whe...
Practice bank - 02Preview
Coupons and Deals Platform
Design a coupons and deals platform where users browse and search a large, frequently changing catalog of deals and redeem coupon codes exactly once p...
Practice bank - 03Preview
Flash Sale
Design a flash sale system where a limited quantity of a hot item goes on sale at a fixed instant and receives a 1000x traffic spike in seconds — inve...
Practice bank - 04Preview
Ticketmaster (General Admission)
Design Ticketmaster for general-admission events — there is no seat map, only a fixed capacity count per ticket tier, and the system must sell tickets...
Ticketmaster - 05Free guide
Web Crawler
Design a web-scale crawler that politely fetches and indexes billions of pages, deduplicates content, and keeps the corpus fresh.
Google - 06Free guide
LLM Inference Gateway
Design an LLM inference gateway that sits between internal product teams and multiple model providers/backends, handling routing, streaming, quotas, a...
OpenAI / Anthropic - 07Preview
AI Training Cluster
Design the scheduler for a large GPU/TPU training cluster shared by multiple teams running distributed training jobs, handling gang scheduling, preemp...
Meta - 08Preview