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Practice the patterns 18 top companies test
- MetaProduct analytics at massive scale — engagement, retention and funnel metrics.
- AmazonOperational and retail metrics — orders, sellers, delivery and top-N reports.
- GoogleClean, efficient solutions — frequency counting, ranking and algorithmic Python.
- UberTrips, drivers and surge — share-of-total and time-window questions.
- StripePayments data — revenue rollups, growth rates and reconciliation.
- DatabricksLakehouse and pipeline work — Spark-style transforms and data modeling.
- SQL: Window functions, retention cohorts, self-joins, recursive CTEs
- Python & pandas: Data wrangling, groupby pipelines, rolling metrics
- Product & ML: Metric design, A/B testing, ML system design theory
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