Intermediate everything in Analytics & Metrics, page 5
Transform a Time Series for a Gradient Boosting Model
Tests your ability to convert a sequential problem into a tabular one. A great answer covers creating lagged/rolling features and time-based features (e.g., day of week), and crucially, specifies a time-aware validation split.
How would you find leading indicators for long-term churn?
Tests your ability to connect a lagging business KPI to leading product metrics. A good answer defines churned/retained cohorts, analyzes first 30-day engagement differences (e.g., feature adoption), and validates findings. A red flag is jumping to ML models.
Calculate Daily Active Users (DAU) with SQL
This tests your ability to translate a business metric into a precise technical definition and query. A good answer defines "active," specifies the event data needed (user_id, timestamp, event_name), and uses COUNT(DISTINCT user_id).
Client-Side vs. Server-Side Event Tracking: Pros and Cons
Tests your grasp of data integrity trade-offs. A good answer defines both, contrasts reliability vs. implementation ease, and gives clear examples like 'payment_processed' (server) vs. 'button_click' (client). Red flag: Ignoring ad-blockers and data loss.
Build a SQL query for a multi-step conversion funnel
Tests your ability to translate a product question into robust SQL. A great answer uses CTEs or left joins to count users at each step, defining the attribution model (e.g., first-touch) and time windows. A red flag is a naive query that double-counts users.
Trade-offs: Bundled Analytics vs. a Warehouse-Native Stack?
This tests your grasp of modern data stack trade-offs: cost, data governance, and flexibility. Discuss the pros of warehouse-native (unified data, lower cost, security) vs. the cons (loss of specialized UI, implementation complexity).
Why do our analytics and backend user counts not match?
This tests your ability to systematically debug data integrity issues. A great answer first defines the metric, then investigates tracking implementation, privacy blockers, and time zone settings. A red flag is blaming one tool without a structured plan.
Client-Side vs. Server-Side Event Tracking
This tests your grasp of data integrity trade-offs. A great answer advocates for server-side tracking for critical events due to its reliability against ad blockers, using client-side only for supplementary UI events. A red flag is treating them as equal.
Architect a Multi-Touch Attribution System
Tests your grasp of data pipeline trade-offs under real-world signal loss. A great answer outlines the pipeline (ingest, store, model), contrasts last-touch (simple state) vs.
Design a User Onboarding Funnel Analysis System
This tests translating a business need into a data model and query. First, define the cohort. Then, use CTEs to find the first timestamp for each event per user. Finally, count users at each step.
Implement an A/B test for a new checkout flow
Tests your grasp of the full A/B testing lifecycle. A great answer outlines a feature flag system, consistent user bucketing via hashing a stable user ID, and an analytics query grouping by variant. A red flag is suggesting simple client-side randomization.
How do you handle the multiple comparisons problem in A/B testing?
Tests your grasp of statistical risk in experimentation. Explain how multiple tests inflate false positives, then describe mitigations like Bonferroni correction or limiting concurrent tests. A red flag is suggesting total test isolation, which is impractical.
Visualize Correlation Between Load Time and Session Duration
Tests your ability to choose the right chart for correlation and layer in additional variables. A great answer starts with a scatter plot (load time vs. session duration), then uses color to represent the network type.
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Set up a cohort analysis for a new onboarding flow
This tests your ability to design a clean experiment to measure product impact. A great answer defines control/treatment cohorts by acquisition date (before/after Jan 1st), picks a specific metric like W1 retention, and compares them.
How to visualize a complex, multi-stage customer funnel?
Tests your ability to choose the right visualization for non-linear user flows. Propose a Sankey or Alluvial diagram to show flow volume, drop-off, and re-entry. A red flag is suggesting multiple simple charts that fail to show the paths between stages.
Enforce GDPR's Right to be Forgotten Across a Complex Architecture
This tests your design of a verifiable, async deletion workflow. A strong answer proposes a central index metastore, an orchestrated workflow (e.g., Step Functions) for deletion, and an auditing layer.
How would you design a 'button_click' analytics event payload?
This tests your ability to design for future analysis. A great answer specifies core identifiers (user ID, timestamp), contextual properties (page, component), and a flat JSON structure. A red flag is forgetting the user ID or providing an unstructured list.
Apply the AARRR framework to B2B SaaS vs. B2C mobile games
Tests translating the AARRR framework into concrete analytics for different business models. Define AARRR, then contrast B2B SaaS (account-level activation) with B2C games (user-level engagement). Red flag: using identical metric definitions for both contexts.
What is the difference between a metric and a KPI?
This tests your ability to connect technical measures to business outcomes. Define metrics as operational data and KPIs as the subset tied to critical goals.
Design a self-service analytics platform for non-technical users
Tests your ability to abstract SQL. A great answer outlines a semantic layer for virtual datasets, a no-code drag-and-drop UI, and a backend that translates UI state into SQL queries. A red flag is describing only a SQL editor, ignoring non-technical users.
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