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Updated weekly · Last refresh Aug 30

Bgc Group Data Engineer Interview Questions

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

25questions
~4htotal time
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1
SQL & Data ManipulationStart here. 3 questions + 2 drills · ~46 min
Top Customers by Sales RevenueEasy
Practice

Use GROUP BY and SUM to rank the top 10 customers by total revenue from a single sales table.

RankingGroup ByAggregationsBgc Group
SQL vs NoSQL for Go-to-Market DataEasy

Explain how SQL and NoSQL differ in schema, consistency, scaling, and Demandbase-style analytics use cases.

JoinsData WranglingBgc Group
Optimizing SQL Query PerformanceMedium

Tests SQL tuning skills and your ability to improve query efficiency and resource usage.

Window FunctionsJoinsAggregationsBgc Group
Monthly Sales Trends by CategoryMedium
Practice
Practice drill

Aggregate monthly sales by product category and use LAG to calculate month-over-month changes.

InfrastructureToolsData WranglingTotal Wine & MoreInc.Benjamin Moore
Contact Center Agent Performance MetricsHard
Practice
Practice drill

Compute daily agent call KPIs and SLA using joins, aggregations, and window ranking in a contact center model.

ETLAggregationsData ModelingADP
2
Pipelines18 questions · ~158 min
Data Validation in ETL PipelinesMedium

Approach for validating ETL data with schema, business rule, and pipeline-level checks.

strategiesETLdata validationBgc Group
Batch vs Stream Processing Trade-offsMedium

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

InfrastructureStream ProcessingETLBgc Group
Design Scalable Pipeline InfrastructureHard

Design the core pipeline infrastructure for a new project, with attention to orchestration, data quality, idempotency, and future scale.

InfrastructureToolsQualityBgc Group
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3
Coding4 questions · ~35 min
Optimizing Sorting for Large DatasetsMedium

Explain how to choose and optimize sorting approaches for large datasets based on memory, data distribution, and stability requirements.

ArraysSortingGreedyBgc Group
Python Data AggregationEasy

Tests your ability to write correct Python for common data transformation tasks.

Hash TablesMathArraysBgc Group
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The finish line: interview-readyComplete all 25 questions plus 2 hands-on drills to finish this plan.