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Problems (423)

Status	Title	Difficulty	Language	Company	Topic
	Model Drift and Retraining Pro	Hard	Conceptual	Meta Amazon	practical-experience
	Model Serving: TorchServe and TF Serving Pro	Hard	Conceptual	Amazon Google Microsoft	deep-learning-libraries
	Month-Over-Month Revenue Change Pro	Hard	SQL	Netflix Spotify Airbnb	window-functions
	Moving Average with Window Frame Pro	Hard	SQL	Amazon Two Sigma Uber	window-functions
	Multi-Step Funnel Analysis With CTEs Pro	Hard	SQL	Meta Airbnb Netflix	ctes
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	Naive Bayes Classifier Pro	Hard	Python	Meta OpenAI	machine-learning
	Naive Bayes Independence Assumption Pro	Hard	Conceptual	Google Meta Twitter/X	machine-learning
	Nested Subquery for Percentile Filtering Pro	Hard	SQL	JPMorgan PayPal Capital One	subqueries
	Neural Network Forward Pass Pro	Hard	Python	Google NVIDIA DeepMind	machine-learning
	North Star Metric Selection Pro	Hard	Conceptual	Uber Airbnb DoorDash	business-skills
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	NTILE for Quartile Bucketing Pro	Hard	SQL	Stripe Airbnb Two Sigma	window-functions
	Orders Exceeding Customer Lifetime Average Pro	Hard	SQL	Amazon Stripe Shopify	subqueries
	Percentile Rank of Order Values Pro	Hard	SQL	Stripe Google Meta	window-functions
	PERCENT_RANK for Distribution Analysis Pro	Hard	SQL	Two Sigma Amazon Uber	window-functions
	Permutation Test Mechanics Pro	Hard	Conceptual	Netflix Uber Airbnb	statistics
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	Polynomial Features Pro	Hard	Python	LinkedIn Salesforce	feature-engineering
	P vs NP Problem Pro	Hard	Conceptual	Google Microsoft	computer-science
	Rank Employees Pro	Hard	SQL	—	window-functions
	Recursive CTE for Number Sequence Pro	Hard	SQL	Databricks Google Snowflake	ctes
	Recursive CTE for Org Hierarchy Depth Pro	Hard	SQL	Snowflake Meta Google	ctes
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	Regression Independence Assumption and Autocorrelation Pro	Hard	Conceptual	Goldman Sachs JPMorgan Capital One	statistics
	REST API Design Principles Pro	Hard	Conceptual	Stripe Airbnb	computer-science
	Revenue Contribution by Region With Rollup Pro	Hard	SQL	Walmart Amazon Stripe	group-by
	ROI Calculation for a Data Project Pro	Hard	Conceptual	Stripe Coinbase Robinhood	business-skills
	Running Total Pro	Hard	SQL	Amazon Stripe	window-functions
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