Foursquare Data Engineer Interview Questions
The questions to prepare for a Foursquare Data Engineer interview. Questions from real interview reports rank first. Updated daily.
Use a hash map to find two array elements that sum to a target in O(n) time.
FoursquareFind the longest substring with all unique characters using a sliding window.
FoursquareExplain how hash tables store data, handle collisions, and why their operations are usually O(1) on average.
FoursquareExplain how you improved a slow ETL pipeline on multi-terabyte data, including bottleneck analysis, tuning choices, and validation.
FoursquareDiscuss the data integration tools you have used and how they fit into ETL, orchestration, and data quality workflows.
FoursquareApproach for maintaining data quality and integrity across ETL pipelines.
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Tests self-awareness around motivation and whether that motivation translates into ownership, learning, and measurable impact.
FoursquareExplain how SQL and NoSQL differ in schema, consistency, scaling, and Demandbase-style analytics use cases.
FoursquareRank venues within each city by visit count and return the top three, including venues with zero visits.
FoursquareCompute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.
Meta
Spotify
Meta ITAggregate monthly sales by product category and use LAG to calculate month-over-month changes.
Total Wine & More
Inc.
Benjamin Moore