Top 36
Prep plan
Updated weekly · Last refresh Oct 17
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Preply Backend Engineer Interview Questions

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

36questions
~5htotal time
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1
System DesignStart here. 9 questions · ~72 min
Ensure Data ConsistencyHard

Design consistency guarantees across distributed ML data, feature, training, and serving components.

Feature Storedistributed systemsdata ingestionPPreply
SQL vs NoSQL for Interaction LogsMedium

Assesses your ability to choose storage technology based on access patterns and operational needs.

nosqlsqlPPreply
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2
Coding13 questions · ~104 min
Set vs Tuple vs ListEasy

Assesses your understanding of Python collection types and their behavioral differences.

Data StructurespythonPPreply
Complexities and Code ImprovementMedium

Evaluates your performance reasoning and your ability to optimize a provided implementation.

time complexityPPreply
Python Decorators Use CasesMedium

Evaluates your understanding of decorators and how they apply to real backend code.

decoratorspythonPPreply
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3
Behavioral & Leadership11 questions · ~88 min
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4
More topics3 questions · ~24 min
Django Transaction OperationMedium

Tests your ability to implement safe transactional behavior in Django.

transactionsPPreply
Microservices Design ConsiderationsMedium

Tests distributed systems design trade-offs and operational awareness.

Trade-offsRisk AssessmentScope ManagementPPreply
Database Index FundamentalsMedium

Assesses your knowledge of indexing strategies and their impact on query performance.

performancePPreply
Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
The finish line: interview-readyComplete all 36 questions plus 3 hands-on drills to finish this plan.