ZorixOS
13+ VK questions

VK interview questions and how to prepare

The questions candidates report from VK interviews, sorted by how often they come up, with difficulty and topics, plus original practice written in VK's interview style.

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ZorixOS tracks 13 community-reported VK interview questions, drawn from an open-source dataset of real interview reports and sorted by how frequently each one comes up. Every question links to its source. Alongside them are 78 original ZorixOS practice questions written in VK's known interview style (not claimed as asked at VK), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to VK.

Updated July 2026

VK interview questions candidates report

Community-reported from real VK interviews (open-source dataset), most-asked first. Showing 13. Each links to its source.

  1. Maximize Distance to Closest Person
    Array
    Medium100% asked
  2. Permutation in String
    Hash TableTwo PointersStringSliding Window
    Medium100% asked
  3. Valid Parentheses
    StringStack
    Easy87% asked
  4. Two Sum
    ArrayHash Table
    Easy82% asked
  5. Move Zeroes
    ArrayTwo Pointers
    Easy80% asked
  6. Longest Subarray of 1's After Deleting One Element
    ArrayDynamic ProgrammingSliding Window
    Medium75% asked
  7. Summary Ranges
    Array
    Easy75% asked
  8. Valid Palindrome
    Two PointersString
    Easy75% asked
  9. Compare Version Numbers
    Two PointersString
    Medium66% asked
  10. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium66% asked
  11. Merge Intervals
    ArraySorting
    Medium66% asked
  12. Symmetric Tree
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy66% asked
  13. Best Time to Buy and Sell Stock
    ArrayDynamic Programming
    Easy64% asked

Practice questions in VK's style

Original ZorixOS questions written the way VK interviews, so you rehearse the real format. Not claimed as asked at VK.

  1. Design a simplified version of VK's News Feed service for a user base of 100M DAU, focusing on content delivery, fan-out, and storage for posts, photos, and videos. How would you handle hot posts going viral?

    Software EngineerSystem DesignTests: Evaluates understanding of distributed systems, scalability, storage, and caching strategies.

  2. VK Music has millions of tracks. Given a stream of user listening events (user_id, track_id, timestamp), write a function get_top_N_recommendations(user_id, N) that returns N tracks most likely to be enjoyed by the user, considering both collaborative filtering aspects (users with similar tastes) and item-based similarity. Describe your data structures and algorithm choices for efficiency at VK's scale. (Assume you have pre-computed embeddings or similarity scores available, focus on retrieval and aggregation).

    Software EngineerCodingTests: Assesses algorithm design, data structure selection, and scalability considerations for recommendation systems.

  3. Users are reporting intermittent buffering issues and disconnects during live video streams on VK Live, especially during peak evening hours. As a backend engineer, describe your diagnostic steps, potential root causes you'd investigate (network, server, CDN, client), and how you'd gather data to pinpoint the problem in a high-traffic production environment.

    Software EngineerDebuggingTests: Checks problem-solving, debugging methodology, and knowledge of video streaming infrastructure.

  4. Design the backend architecture for VK Messenger's group chat feature, supporting millions of concurrent users and ensuring message delivery, ordering, and offline message storage. How would you handle read receipts and typing indicators efficiently?

    Software EngineerSystem DesignTests: Evaluates knowledge of real-time communication protocols, distributed queues, and persistent storage for messaging.

  5. VK needs to filter out spam messages containing malicious URLs or inappropriate content. Design a function is_spam(message_text, sender_id) that leverages a set of rules and potentially a machine learning model endpoint. Focus on how you'd combine different signals and ensure low latency for real-time message processing on VK's platform.

    Software EngineerCodingTests: Assesses ability to combine rule-based and ML approaches, and consider performance for critical path operations.

  6. VK users upload petabytes of photos and videos daily. Design a system for storing, indexing, and serving these media files efficiently, considering different resolutions, transcoding needs, and content delivery network (CDN) integration for global (within Russia/CIS) distribution.

    Software EngineerSystem DesignTests: Evaluates understanding of large-scale blob storage, CDN usage, and media processing pipelines.

72+ more VK-style questions are in the free library, each practiceable live with adaptive follow-ups and an honest scorecard. Start free.

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VK Interview Questions (2026) | ZorixOS