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Updated weekly · Last refresh Aug 30

DEX Software Engineer Interview Questions

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

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1
CodingStart here. 8 questions · ~72 min
Reverse a String in PythonEasy
Practice

Reverse a string in Python using character traversal and return the reversed result.

StringsfunctionspythonDEX
Object-Oriented Programming PrinciplesEasy

Tests your understanding of OOP concepts and how they guide software design.

Hash TablesArraysStringsDEX
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2
Execution4 questions · ~36 min
Troubleshooting Slow SystemsMedium

Tests diagnostic skills, performance investigation, and structured troubleshooting.

Trade-offsRisk AssessmentDEX
RESTful APIs and ImportanceMedium

Tests your understanding of API design and how REST supports system integration.

Trade-offsRoadmappingDEX
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3
Behavioral & Leadership8 questions · ~72 min
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4
More topics4 questions · ~36 min
Design a Cold Start RankerMedium

Design a recommendation and ranking system that handles cold start for both new users and new items without hurting feed quality.

Cold StartTwo-Tower ModelsRecommendation SystemsDEX
Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQualityDEX
End-to-End ML System DesignHard

Tests system design depth across ML lifecycle and operational monitoring for a production product.

Feature StoreModel ServingRecommendation SystemsDEX
SQL vs NoSQL DifferencesMedium

Tests database fundamentals and practical decision-making for data storage at DEX.

InfrastructureData ModelingDEX

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