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Yahoo Data Engineer Interview Questions

The questions to prepare for a Yahoo Data Engineer interview. Questions from real interview reports rank first. Updated weekly.

50questions
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1
CodingStart here. 7 questions · ~68 min
B-Tree Height Coding ProblemEasy
Practice

Compute a B-Tree's height with recursive traversal, returning the number of levels from root to leaf.

AlgorithmsYahoo
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonYahoo
Merge Two Sorted ArraysEasy
Practice

Merge two sorted arrays into one sorted array using a two-pointer linear scan.

ArraysSortingTwo PointersYahoo
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2
SQL & Data Manipulation9 questions · ~88 min
Running Total With Window FunctionsEasy
Practice

Calculate each user's running order total over time using a window function.

Window FunctionsDate FunctionsRunning TotalsYahoo
Join and Aggregate by DayMedium
Practice

Aggregate Yahoo Mail messages and ad clicks by day using joins, CTEs, date extraction, and conditional aggregation.

Date FunctionsJoinsAggregationsYahoo
Retention by Cohort SQLHard
Practice

Calculate Yahoo Mail monthly cohort retention with multi-level CTEs, calendar periods, deduplicated activity, and retention percentages.

Window FunctionsDate FunctionsAggregationsYahoo
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3
Pipelines20 questions · ~195 min
Data Quality and Schema EvolutionMedium

Approach for handling schema changes and data quality checks in a high-volume data lake pipeline.

schema evolutionData ModelingQualityYahoo
Batch vs Stream Processing Trade-offsMedium

Compare batch and stream processing across latency, complexity, cost, and data quality in a modern analytics pipeline.

InfrastructureStream ProcessingETLYahoo
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4
Behavioral & Leadership14 questions · ~136 min
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