People Tech Group Mobile Engineer Interview Questions

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

20questions

~3htotal time

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CodingStart here. 5 questions · ~41 min

Design an Image Cache LibraryHard

Design an in-memory image cache and explain how to evict, downscale, and react to memory pressure.

Hash TablesQueueHeap

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Biometric Local AuthenticationMedium

Tests secure mobile authentication design and correct use of biometric hardware APIs.

authenticationSecurityoop

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Explain ANR InternalsMedium

Evaluates your understanding of ANR causes, runtime behavior, and debugging approach.

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Kotlin and Java InternalsHard

Tests your grasp of data structures, complexity, and practical implementation in Kotlin/Java.

Data Structures

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Unit Testing and APNSMedium

Assesses testing discipline and your ability to deliver reliable push notification functionality.

design patterns

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Behavioral & Leadership15 questions · ~123 min

Optimizing a Production Mobile BottleneckEasy

Tests ownership and prioritization in fixing a real mobile production performance issue, with emphasis on diagnosis, trade-offs, and measurable user impact.

CommunicationOwnershipPrioritization

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Explaining Technical Issues to ExecutivesEasy

Tests communication and influence: can you translate technical complexity into business decisions, align stakeholders, and drive action?

Influence Without AuthorityStakeholder ManagementCommunication

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Leading a Mobile Architecture ResetMedium

Tests leading through ambiguity in mobile architecture decisions, with ownership, influence without authority, and prioritization under delivery pressure.

mobile applicationdesign patternsstate management

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