Pattern series
Virtual Queue / Admission Control
5 System Design questions share this exact tag. Use the closely related series below for a fuller drill.
- 01Preview
Donation Platform
Design a donation platform like GoFundMe — a campaign can go viral overnight and receive a massive spike of small donations, and every dollar must be...
Practice bank - 02Preview
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 - 03Preview
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 - 04Free guide
Ticketmaster
Design Ticketmaster — an event ticketing system that sells reserved seats under extreme flash-sale contention without ever double-selling a seat.
Ticketmaster - 05Free 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