WEX Backend Engineer Interview Questions
The questions to prepare for a WEX Backend Engineer interview. Questions from real interview reports rank first. Updated daily.
Use post-order DFS to compute each folder's total size, including files in all nested subfolders.
WEXImplement lazy Singleton initialization that safely returns one shared instance across concurrent threads.
WEXDesign an extensible object-oriented logging and alerting system with thresholds, subscriptions, and multiple notification channels.
WEXDesign the BookMyShow payment flow with reliable state handling, gateway integration, and optional ML-based payment risk detection.
WEXExplain an internal ML project's HLD, measure your architectural impact, and propose improvements you would make in hindsight.
WEXUse a PostgreSQL join to include departments without employees and count matching employees.
WEXEvaluates your ability to choose APIs based on constraints in microservices.
WEXExplain how to diagnose and optimize a slow PostgreSQL query on large customer datasets.
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Rewrite a slow PostgreSQL loan payment query to reduce scanned rows while preserving the required aggregated results.
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AmeripriseEEltro Cyberchrome PrivateCalculate 30-day rolling average transaction volume for WEX Fleet One accounts using aggregation and window functions.
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