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Updated weekly · Last refresh Sep 26

Juspay Backend Engineer Interview Questions

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

22questions
~3htotal time
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1
CodingStart here. 11 questions · ~91 min
Explain Binary Search ComplexityEasy

Evaluates understanding of binary search and its time complexity.

binary searchtime complexityJuspay
Nearest Neighbor Tree in GridMedium

Tests ability to design algorithms for spatial nearest neighbor style problems using trees.

TreesJuspay
Hard LeetCode-Style CodingHard

Assesses problem-solving strategy under hard coding constraints.

leetcodeAlgorithmsJuspay
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2
System Design7 questions · ~58 min
Thread Safety in High ConcurrencyHard

Evaluates your understanding of concurrency hazards and safe design patterns.

thread safetyJuspay
Constrained System OptimizationMedium

Assesses your ability to model and solve optimization problems under real constraints.

Juspay
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3
More topics4 questions · ~33 min
Understanding ACID Properties in DatabasesMedium

Explain the ACID properties of database transactions and their importance.

Juspay
Memory Architecture and Digital LogicHard

Tests understanding of memory systems and basic digital logic for infrastructure-level reasoning.

Juspay
Indexing for Payment Gateway QueriesMedium

Evaluates your understanding of how indexing affects latency and throughput in payment workloads.

Juspay
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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Top Merchants QueryEasy
Practice
Practice drill

Use aggregation and joins to return the 10 merchants with the highest transaction counts.

JoinsGroup BysqlSSumUpJuspay
Checked vs Unchecked ExceptionsEasy
Practice
Practice drill

Compare checked and unchecked Java exceptions by retrieving their compile-time handling requirements and representative examples.

error handlingjavadatabase conceptsTThe CardWalmart Labs
SQL Data Structure ReviewHard
Practice
Practice drill

Audit PostgreSQL metadata for missing or invalid keys and tables with inefficient sequential-scan patterns.

database optimizationindexesData StructuresMercury
The finish line: interview-readyComplete all 22 questions plus 3 hands-on drills to finish this plan.