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Deutsche Bank Data Engineer Interview Questions

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

11questions
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1
CodingStart here. 3 questions · ~30 min
Linked List ReversalEasy
Practice

Reverse a singly linked list in-place using iterative pointer manipulation.

RecursionLinked ListsArraysDeutsche Bank
Searching in a Binary Search TreeEasy

Explain how BST search works by comparing the target at each node and analyze best, average, and worst-case time complexity.

time complexitySearchingTreesDeutsche Bank
Parsing Nested JSON InputsMedium

Evaluates your ability to parse and process nested JSON data reliably in code.

data parsingDeutsche Bank
2
SQL & Data Manipulation3 questions + 3 drills · ~60 min
Optimizing Slow Queries at ScaleHard

Explain how to diagnose and optimize a slow PostgreSQL query on large Apidel Technologies datasets.

SubqueriesJoinsData WranglingDeutsche Bank
Star vs Snowflake for Sales AnalyticsMedium

Compare star and snowflake schemas for warehouse design, including trade-offs in normalization, query simplicity, and analytics performance.

JoinsData WranglingGroup ByDeutsche Bank
Using SQL Analytical FunctionsMedium

Assesses your knowledge of SQL analytical functions for data analysis and transformations.

sqlDeutsche Bank
Third Highest Salary in SQLEasy
Practice
Practice drill

Find the third-highest distinct salary at NCR Voyix using DENSE_RANK and a department join.

sqlNCRDeutsche Bank
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
Unify CRM and Google Analytics ViewHard
Practice
Practice drill

Merge CRM orders with GA events via an identity map to build a customer-level view using joins, window functions, and monthly rollups.

SubqueriesJoinsData WranglingArtefact

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3
Behavioral & Leadership3 questions · ~30 min
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4
More topics2 questions · ~20 min
Complex ETL Pipeline ArchitectureHard

Explain the architecture of a complex ETL pipeline built from scratch, including orchestration, data quality, idempotency, and backfill strategy.

InfrastructureETLData ModelingDeutsche Bank
Handling Streaming Ingestion FailuresMedium

Evaluates your approach to resilience, retries, and data correctness in streaming ingestion.

streamingerror handlingdata ingestionDeutsche Bank
The finish line: interview-readyComplete all 11 questions plus 3 hands-on drills to finish this plan.