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A customer says they need 'real-time dashboards.' How do you respond, batch or streaming?

A requirements-interrogation question disguised as an architecture question. The first move isn't Kafka, it's a freshness-SLA conversation that usually deletes 90% of the cost. Here's the script strong FDEs run.

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 trackETL vs ELT, what changed, and when is classic ETL still the right call?Premium Next in this trackDesign a daily pipeline that survives reruns, late-arriving data, and a 3-year backfill, without double-counting.Premium Next in this trackYou must ingest from a customer source that ships nulls, duplicates, and surprise schema changes. Design defensive ingestion.Premium

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