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Updated weekly · Last refresh Aug 30

Bloomberg Data Engineer Interview Questions

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

17questions
~2htotal time
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1
PipelinesStart here. 3 questions · ~25 min
Schema Evolution in Data LakesMedium

Assesses your methods for managing schema changes safely in distributed storage and analytics systems.

schema evolutionBloomberg
Designing PySpark ETL on DatabricksMedium

Assesses your approach to building scalable ETL pipelines for real-time processing with PySpark and Databricks.

pysparkdatabricksBloomberg
Migrating Legacy Pipelines to CloudMedium

Evaluates how you maintain data quality and consistency during legacy-to-cloud pipeline migrations.

Data Qualitylegacy systemsBloomberg
2
Coding5 questions · ~41 min
Debugging a Memory LeakMedium

Tests your systematic debugging skills and ability to diagnose memory issues in data processing code.

memory leakdata processingDebuggingBloomberg
Caching for High-Frequency Market LookupsHard

Assesses your design for low-latency caching and correctness under high request rates.

cachingmicroservicesBloomberg
Nested JSON Transform Under Memory LimitsHard

Evaluates your ability to implement memory-efficient parsing and transformation for streaming JSON data.

json parsingBloomberg
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3
Behavioral & Leadership8 questions · ~66 min
Linux Automation for OperationsMedium

Tests your hands-on operational automation skills in Linux to support reliable data engineering.

linuxscriptingBloomberg
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4
More topics1 question · ~8 min
Optimizing SQL for ThroughputMedium

Tests your ability to diagnose and improve SQL and relational schema performance for high-ingestion workloads.

Bloomberg
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
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
SQL Duplicate Record DetectionEasy
Practice
Practice drill

Find duplicate American Institutes for Research assessment submissions using a CTE, GROUP BY, HAVING, and joins.

deduplicationsqldata integrityAmerican Institutes for ResearchMacy's
SQL Window DeduplicationMedium
Practice
Practice drill

Use ROW_NUMBER and windowed COUNT to retain the latest TruValidate record for each duplicate business key.

Window FunctionsdeduplicationRankingTransUnionCCS Global Tech
The finish line: interview-readyComplete all 17 questions plus 3 hands-on drills to finish this plan.