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Updated weekly · Last refresh Oct 17

Unknowns Mobile Engineer Interview Questions

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

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1
CodingStart here. 23 questions · ~249 min
Valid Palindrome String CheckEasy
Practice

Check whether a string is a palindrome using two pointers while ignoring case and non-alphanumeric characters.

Hash TablesStringsTwo PointersUnknowns
Longest Unique Substring in EnoMedium
Practice

Use a sliding window and hash map to find the longest substring without repeated characters in a string.

Hash TablesStringsTwo PointersUnknowns
Two-Sum ProblemEasy
Practice

Find two Box file sizes that sum to a target using a hash map in O(n) time.

Hash TablesArraysUnknowns
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2
Technical Fundamentals5 questions · ~54 min
Swift vs Objective-C DifferencesEasy

Tests your understanding of iOS language differences relevant to maintaining and evolving codebases.

CommunicationOwnershipUnknowns
Conduct Mobile Code ReviewsEasy

Assesses your code review criteria and your ability to improve quality in a mobile team.

CommunicationOwnershipUnknowns
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3
Behavioral & Leadership19 questions · ~206 min
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4
More topics3 questions · ~32 min
Filter and Search Large DatasetMedium

Tests your product thinking and technical design for scalable search and filtering in mobile apps.

Feature PrioritizationUser NeedsUse CasesUnknowns
State Management with MVVMMedium

Assesses your approach to managing UI and data state in a scalable mobile architecture.

CommunicationOwnershipUnknowns
MVVM Architecture and BenefitsEasy

Assesses your understanding of MVVM and its impact on mobile code organization.

CommunicationOwnershipUnknowns

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