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Top 29
Prep plan
Updated weekly · Last refresh Sep 25

Photon Backend Engineer Interview Questions

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

29questions
~4htotal time
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1
System DesignStart here. 13 questions · ~117 min
Ensure Data ConsistencyHard

Tests your understanding of consistency models, distributed transactions, and practical trade-offs.

distributed systemsdata consistencyarchitecturePhoton
REST vs GraphQL for High TrafficMedium

Assesses API design trade-offs for performance, flexibility, and client needs.

restapi designPhoton
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2
Coding5 questions · ~45 min
Difference Between Interface and Abstract Class in JavaMedium

Explain the differences between interfaces and abstract classes in Java and when to use each.

Hash TablesArraysStringsPhoton
Memory Leaks in Long-Running JavaMedium

Evaluates debugging and prevention strategies for memory issues in production Java services.

memory managementjavaperformance optimizationPhoton
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3
SQL & Data Manipulation4 questions + 1 drill · ~46 min
Checked vs Unchecked ExceptionsEasy
Practice

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

error handlingjavadatabase conceptsPhoton
Core Java and Spring MicroservicesMedium
Practice
Practice drill

Return cardholders whose 2025 approved transaction total is at least 1000 across multiple transaction records.

javaJoinssqlMastercard
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4
Behavioral & Leadership3 questions · ~27 min
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5
More topics4 questions · ~36 min
Refactoring Legacy for PerformanceMedium

Assesses execution skills, impact measurement, and performance-focused refactoring.

refactoringperformancelegacy systemsPhoton
Zero-Downtime Legacy DB MigrationHard

Tests planning and execution for safe migrations with minimal or no service disruption.

legacy systemsPhoton
Connection Pooling for High TrafficMedium

Assesses practical performance tuning and resource management for backend services.

javaperformancePhoton
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The finish line: interview-readyComplete all 29 questions plus 1 hands-on drill to finish this plan.