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Updated weekly · Last refresh Sep 25

Paytm Backend Engineer Interview Questions

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

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1
CodingStart here. 8 questions · ~68 min
Analyze Time and Space ComplexityEasy
Recently asked

Explain how to derive time and space complexity for a coding solution and justify the final Big O bounds.

Hash TablesArraysSortingPaytm
Mirror Image TreesMedium
Recently asked

Evaluates tree traversal logic and correctness for mirror checks.

RecursionPaytm
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2
Technical Fundamentals8 questions · ~68 min
Backend Collections, Cache, LoggingMedium
Recently asked

Assesses your practical backend engineering experience across performance and observability components.

collectionscachePaytm
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3
SQL & Data Manipulation5 questions + 3 drills · ~73 min
Ensuring Data IntegrityMedium
Recently asked

Evaluates your practices for preventing invalid states and maintaining correct data over time.

data integrityPaytm
Common Users Between Two TablesEasy
Practice
Recently asked
Practice drill

Use CTEs and an INNER JOIN to find distinct Paytm users active in both Wallet and UPI during January 2026.

JoinssqlPaytm
Max Salary Across DepartmentsMedium
Practice
Practice drill

Find each department's maximum salary and all employees tied at that salary using aggregation and joins.

aggregationsqlInformaticaPaytm
Validate Data IntegrityMedium
Practice
Practice drill

Audit transaction records for missing references, invalid values, duplicate user emails, and unusable dates before analysis.

data preparationdata anomalydata validationKeystonePaytm
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4
System Design8 questions · ~68 min
Logging and Monitoring DesignHard
Recently asked

Evaluates your ability to build observability for diagnosing issues across services.

monitoringdistributed systemsPaytm
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5
Behavioral & Leadership12 questions · ~103 min
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6
More topics5 questions · ~43 min
Authentication and AuthorizationMedium
Recently asked

Assesses security design knowledge for access control in backend systems.

authenticationauthorizationPaytm
Performance Monitoring ToolsMedium
Recently asked

Tests your ability to instrument systems and use monitoring to drive architectural decisions.

experienceToolsarchitecturePaytm
API Design ConsiderationsMedium
Recently asked

Tests API design principles including contracts, versioning, security, and usability.

Trade-offsSuccess CriteriaScope ManagementPaytm
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The finish line: interview-readyComplete all 46 questions plus 3 hands-on drills to finish this plan.