Top 30
Prep plan
Updated weekly · Last refresh Oct 17

Brex Backend Engineer Interview Questions

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

30questions
~4htotal time
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1
System DesignStart here. 12 questions · ~98 min
Data Consistency in MicroservicesHard

Tests your consistency strategy across services, including transactions and eventual consistency.

distributed systemsconsistencymicroservicesBrex
Brex-Style Balance Check and FraudHard

Tests backend design for balance validation plus baseline fraud detection using transaction data.

fraud detectionBrex
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2
SQL & Data Manipulation3 questions + 3 drills · ~54 min
3
Execution3 questions · ~24 min
Distributed Performance BottlenecksMedium

Assesses practical performance troubleshooting and optimization approaches in distributed systems.

Problem Solvingdistributed systemsBrex
Rate Limiting for Public APIHard

Tests ability to protect APIs using throttling strategies and correct failure behavior.

Trade-offsRisk AssessmentScope ManagementBrex
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4
Coding4 questions · ~33 min
Debugging a Production Memory LeakMedium

Assesses diagnostic skills and practical debugging workflow for production memory issues.

memory leakDebuggingBrex
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5
Behavioral & Leadership7 questions · ~57 min
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6
More topics1 question · ~8 min
The finish line: interview-readyComplete all 30 questions plus 3 hands-on drills to finish this plan.