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Updated weekly · Last refresh Aug 30

PayPal Mobile Engineer Interview Questions

The questions to prepare for a PayPal Mobile Engineer interview. Questions from real interview reports rank first. Updated weekly.

45questions
~7htotal time
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1
CodingStart here. 26 questions · ~238 min
Maximum Sum Contiguous SubarrayEasy
Practice

Use Kadane's algorithm to find the contiguous subarray with the largest sum in linear time.

Dynamic ProgrammingArraysGreedyPayPal
Directed Graph Cycle DetectionMedium
Practice

Determine whether a directed graph contains a cycle using DFS or topological sorting.

RecursionGraphsPayPal
Reusable Networking LayerHard

Tests your ability to build production-grade networking components for PayPal APIs with reliability and performance.

network requestscachingFrameworksPayPal
API to Screen With UIKit or SwiftUIMedium

Tests your ability to connect PayPal-style APIs to UI while managing data flow and user experience.

network requestsFrameworksPayPal
NotificationCenter-Like PublisherHard

Tests your ability to implement observer-style patterns and state change propagation in mobile apps.

abstractionoopPayPal
Detect Cycles in Payment GraphMedium

Tests your ability to apply graph algorithms to detect suspicious patterns in payment flows.

dfsbfsGraphsPayPal
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2
Behavioral & Leadership18 questions · ~165 min
Technical Trade-off Under DeadlineEasy

Tests prioritization and decision-making under pressure, especially how you balance speed, quality, and long-term technical cost.

Decision MakingTrade-offsstarPayPal
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3
More topics1 question · ~9 min
Design a Payment ApplicationHard

Evaluates product thinking, system design trade-offs, and mobile integration for payments.

designPayPal

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