Top 12
Prep plan
Updated weekly · Last refresh Aug 30
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BCG Data Engineer Interview Questions

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

12questions
~2htotal time
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1
CodingStart here. 3 questions · ~29 min
Two Sum With Sorted HintEasy
Practice

Find two indices in a sorted array whose values equal a target using the two-pointer technique in O(n) time.

leetcodeAlgorithmsBBCG
SQL to PySpark TransformationMedium

Assesses understanding of translating SQL logic into PySpark DataFrame operations.

pysparksqlBBCG
Optimize Slow PySpark CodeMedium

Evaluates performance-tuning skills for PySpark workloads.

pysparkperformanceoptimizationBBCG
2
SQL & Data Manipulation3 questions + 3 drills · ~59 min
PySpark and SQL Coding RoundMedium

Tests ability to connect core coding fundamentals with SQL and PySpark data manipulation.

pysparkData StructuressqlBBCG
Fill Null Values in PySparkMedium

Evaluates data preprocessing skills for handling missing values in PySpark.

pysparkdata cleaningBBCG
SQL vs NoSQL DifferencesEasy

Tests understanding of relational vs non-relational data models and when to use each.

JoinsData WranglingAggregationsBBCG
Rolling Average with SQL WindowsMedium
Practice
Recently asked
Practice drill

Calculate each active RpmGlobal Enterprise Planning user's 30-day rolling average of daily activity.

TavantRpmglobalTwo Six Technologies
Weekly Service KPI by TeamMedium
Practice
Practice drill

Analyze weekly service delivery performance by team using joins, a CTE, date aggregation, and KPI calculations.

KPIJoinssqlDeloitteReputation
SQL Missing Marks RuleEasy
Practice
Practice drill

Use GROUP BY and HAVING to exclude students missing marks in two or more subjects.

data cleaningsqlPayPal
3
Behavioral & Leadership4 questions · ~39 min
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4
More topics2 questions · ~20 min
Secure Cross-Network DB Access in AWSHard

Tests secure networking design for accessing private AWS data stores.

SecurityawsBBCG
Clean and Describe Data in PySparkMedium

Evaluates practical data cleaning and exploratory analysis skills in PySpark.

pysparkdata cleaningBBCG

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