DEX Software Engineer Interview Questions

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

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CodingStart here. 7 questions · ~72 min

Reverse a String in PythonEasy

Practice

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

Stringsfunctionspython

DEX

Object-Oriented Programming PrinciplesMedium

Practice

Implement shape classes using abstraction, encapsulation, inheritance, and polymorphism to calculate total area.

Hash Tablesclean codeArrays

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Execution4 questions · ~41 min

Troubleshooting Slow SystemsMedium

Tests diagnostic skills, performance investigation, and structured troubleshooting.

Trade-offsRisk Assessment

DEX

RESTful APIs and ImportanceMedium

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

Trade-offsRoadmapping

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Behavioral & Leadership8 questions · ~82 min

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More topics4 questions · ~41 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 Systems

DEX

Data Quality in ETL PipelinesEasy

Approach for maintaining data quality and integrity across ETL pipelines.

IdempotencyData ModelingQuality

DEX

SQL vs NoSQL DifferencesMedium

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

InfrastructureData Modeling

DEX

End-to-End ML System DesignHard

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

Feature StoreModel ServingRecommendation Systems

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