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PayPal Interview Question Bank

PayPal's loop is built from 45-minute rounds that often pack two or three classic problems into one session, alongside resume-driven deep dives and a hiring-manager conversation. Interviewer style varies widely, so be ready to drive the conversation and move fast.

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Last updated 2026/10/15

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Banking System Operations

Implement createAccount / deposit / transfer plus getTopSpenders(n) (top n by cumulative outgoing transfers, ties broken lexicographically by accountId). Stretch goal: schedulePayment with a delay and cancelPayment by id. Scheduled payments execute by due time, not creation order, so a plain FIFO queue is the wrong structure.

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Banking System Operations Implement LRU Cache Maximum Subarray Sum Lowest Common Ancestor of Two Nodes in a Binary Tree Binary Search Tree Pruning Number of Unique Binary Trees Minimum Steps to Move Balls to Respective Holes API Call and Data Processing Graph Traversal using BFS/DFS Find Reachable Good Endings in Choose Your Own Adventure Book Search Word in 2D Array Items Purchase (For Java Backend Engineer)Find Minimum Price to Spend Count User Logins (Singapore)Modify Array Similar Password (Singapore)K-Means Clustering Implementation with Manual Initialization Minimum Time to Schedule Processes on Degrading Processors

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