Interview Simulator · System Design
Design the Company Data Platform
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 company with 3,000 engineers and 400 services runs a separate set of pipelines in each org, feeding one of three warehouses, and every team builds its own PII masking. Design the data platform everyone moves to, covering ingestion, a lakehouse, governance and PII controls, self-serve analytics, and the path off the patchwork.