Interview Pro Tip
Pro-Move: 'We built an exec dashboard with 6 KPIs, 3 drill levels, and 15-min refresh—reduced where is this number from questions 90%.' Red Flag: Dashboard without clear KPI definition—garbage in, garbage out.
**Architecture**: Define KPIs with stakeholders. Source data—pipeline to curated layer. Design schema (star/snowflake). Build pipeline (idempotent, incremental). Visualize (Tableau, Looker). Refresh schedule (daily/hourly). **Key**: Actionable metrics; clean design; filters and drill-downs. **Scalability**: Pre-aggregate for large datasets; use materialized views....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Uber. The answer also includes follow-up discussion points that interviewers commonly explore.
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