Viber Mobile Engineer Interview Questions

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

25questions

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CodingStart here. 16 questions · ~136 min

Compare arrays and linked lists by memory layout, access cost, and update performance, and explain when each is the better choice.

Handling Multithreading on MobileMedium

Tests your ability to design safe concurrency for mobile responsiveness and correctness.

synchronizationQueue

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Multithreading in MobileMedium

Tests your understanding of concurrency fundamentals and why they matter for responsive mobile apps.

synchronizationQueue

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Kotlin Generics UsefulnessEasy

Tests understanding of Kotlin generics and how they improve type safety and code reuse.

Hash TablesArraysStrings

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Product Sense3 questions · ~25 min

Tests product sense for building messaging experiences with correct UX, data flow, and reliability.

Offline-First Mobile ArchitectureMedium

Tests your ability to design offline-capable architectures with synchronization and conflict handling.

MVPUse CasesProduct Vision

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Real-Time Communication ConsiderationsMedium

Tests your ability to reason about latency, reliability, and scalability for real-time mobile messaging.

User NeedsPain PointsProduct Vision

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Behavioral & Leadership6 questions · ~51 min

Prioritizing Across Competing Client ProjectsEasy

Tests prioritization under pressure across multiple projects, including trade-off judgment, stakeholder communication, and ownership of outcomes.

OwnershipPrioritization

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The finish line: interview-readyComplete all 25 questions to finish this plan.