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Design the data model for AI-agent conversation logs, for product analytics AND eval mining.

The question where data engineering meets the AI-native FDE job. Conversations, turns, LLM calls and tool calls each have their own grain, model them wrong and neither the cost dashboard nor the eval set can be built.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

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Next in this trackThe nightly job that took 1 hour now takes 9, since a new source was onboarded. Triage it live.Premium Next in this trackFrom user activity logs, find the top 3 most active users for each day, handling ties appropriately.Premium Next in this trackWrite a query for the top 5 product pairs bought together by the same user in the same transaction.Premium

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