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Updated weekly · Last refresh Aug 30

Plangrid Data Engineer Interview Questions

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

25questions
~4htotal time
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1
PipelinesStart here. 9 questions · ~78 min
Repartition vs Coalesce and CachingMedium
Recently asked

Tests Spark partitioning tradeoffs and caching decisions for performance tuning.

cachingsparkpartitioningPlangrid
Config-Driven Pipeline With Rate LimitsHard
Recently asked

Tests pipeline robustness, error handling, and operational logging for batch API ingestion.

error handlingPlangrid
Spark Join Strategy and SkewHard
Recently asked

Tests Spark join mechanics and practical mitigation of skew to control runtime and memory.

JoinssparkPlangrid
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2
SQL & Data Manipulation3 questions + 3 drills · ~56 min
Inner vs Left Join With NullsMedium
Recently asked

Tests join semantics, null handling, and strategies to prevent row explosion in large joins.

null handlingJoinsperformancePlangrid
Sessionization and Rolling RetentionHard
Recently asked

Tests advanced SQL for behavioral metrics over rolling windows and session boundaries.

Window FunctionsRetentionRunning TotalsPlangrid
SQL Window FunctionsEasy

Tests understanding of SQL window functions and applying them with Python.

Window FunctionssqlPlangrid
7-Day Rolling Active UsersMedium
Practice
Practice drill

Compute daily active users and a 7-day rolling average using a CTE, distinct counts, and window functions.

Window FunctionsDate FunctionsRunning TotalsMetaSpotifyMeta IT
Monthly Active User Growth by PlatformMedium
Practice
Practice drill

Use joins, CTEs, and monthly aggregation to compute Google Maps active users and month-over-month growth.

Window FunctionsDate FunctionsAggregationsEngineGoogleZoomInfo Technologies
Pivot Lucid Campaign Performance by MonthMedium
Practice
Practice drill

Use joins, a CTE, CASE expressions, and monthly pivoting to compare Lucid campaign performance across channels.

pivot tablesnull handlingData WranglingLucid Motors
3
Behavioral & Leadership11 questions · ~95 min
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4
More topics2 questions · ~17 min
Merge Overlapping IntervalsMedium
Practice
Recently asked

Sort intervals by start time, then merge overlapping ranges into a minimal non-overlapping list.

ArraysSearchingSortingPlangrid
Flatten Irregular JSON ConfigMedium
Recently asked

Tests Python parsing, recursion/iteration, and transformation of irregular nested JSON into tabular structure.

json parsingfunctionspythonPlangrid

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