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Updated weekly · Last refresh Oct 17

PayPal Mobile Engineer Interview Questions

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

46questions
~7htotal time
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1
CodingStart here. 24 questions · ~226 min
Valid Brackets ValidationEasy
Practice

Use a stack to determine whether every bracket is correctly matched and properly nested.

coding challengeStackStringsPayPal
Valid Brackets CheckerEasy
Practice

Use a stack to determine whether nested UI configuration brackets are correctly matched and ordered.

coding challengeStackBasic AlgorithmsPayPal
Maximum Sum Contiguous SubarrayEasy
Practice

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

Dynamic ProgrammingArraysGreedyPayPal
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2
Technical Fundamentals7 questions · ~66 min
Concurrency With GCD and CoroutinesMedium

Tests your understanding of concurrency primitives and how you prevent UI blocking and race conditions in PayPal apps.

technical experienceconcurrencyPayPal
Fix SwiftUI Code and Visual BugsMedium

Tests your ability to read SwiftUI code, identify UI problems, and propose precise fixes.

swiftuitechnical experiencePayPal
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3
Software Architecture3 questions · ~28 min
Modular Payment SDK DesignHard

Tests your ability to design reusable, secure, and integration-friendly payment components for PayPal merchants.

collaborationsolution designtechnical experiencePayPal
Offline-First Sync and ConflictsHard

Tests your ability to design robust offline sync and data consistency strategies for PayPal transaction experiences.

cachingsolution designtechnical experiencePayPal
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4
Behavioral & Leadership11 questions · ~104 min
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5
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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