Interview Simulator · System Design
Design a Cell-Based Architecture
A full 45 minute round, one phase at a time. Each phase has a time budget, follow-up questions from the interviewer, and a checklist for your level. Reveal a phase's model answer whenever you need it; the report shows which phases you earned.
A consumer platform with 120M accounts runs on one shared stack in each of three regions, and its last two major outages each took down a full region. Design the target cell-based architecture and the two year path to it for 400 services owned by 60 teams.