Viber Mobile Engineer Interview Questions

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

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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.

Java Native Threads and FixMedium

Assesses understanding of native threading and practical debugging of concurrency issues.

java

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Thread Safety and DeadlocksHard

Tests your ability to build thread-safe mobile code and prevent race conditions and deadlocks.

multithreadingconcurrency

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Product Sense3 questions · ~25 min

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

Designing a Messaging FeatureMedium

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

User NeedsValue PropositionUse Cases

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Offline-First Mobile ArchitectureMedium

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

MVPUse CasesProduct Vision

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Behavioral & Leadership5 questions · ~42 min

Owning a Device-Specific CrashEasy

Tests ownership and communication under ambiguity when diagnosing a device- or OS-specific production crash.

CommunicationOwnershipDealing With Ambiguity

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