1 min lesson
The recurring trio: scale, cost, security
Imagine this comes up at work: "The JD's three example projects are a hint about the interview. What single lens should you apply to almost any system-design answer in this loop?" Start with the practical move.
Step 1 of 2
The recurring trio: scale, cost, securitythe lens for every answer
Read all three projects together and the same three constraints appear in each. Scale, cost and security are the axes Cursor optimizes on and a strong system-design answer holds all three at once rather than maximizing one.
"I'd Z-order the bronze table on the high-cardinality filter columns and run scheduled compaction to kill small files - that cuts both query cost and the metadata overhead. I'd gate the agent-training extract behind Unity Catalog column masking so the cost win never comes at the expense of PIIPersonally Identifiable Information. Data that can identify a person (names, emails, SSNs); regulated and sensitive. Press Enter for the full definition. exposure." One sentence, all three axes.
Answering only on scale is the most common miss. A candidate who designs a beautiful high-throughput pipeline but never mentions cost-per-TB or who can read the agent data reads as someone who has only worked where money and compliance were someone else's problem. At Cursor's scale they are yours.