ZorixOS
4+ Comcast questions

Comcast interview questions and how to prepare

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

Practice Comcast questions free All companies

ZorixOS tracks 4 community-reported Comcast 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 98 original ZorixOS practice questions written in Comcast's known interview style (not claimed as asked at Comcast), so you can rehearse the real format. Practice any of them out loud in a free AI mock interview tuned to Comcast.

Updated July 2026

Comcast interview questions candidates report

Community-reported from real Comcast interviews (open-source dataset), most-asked first. Showing 4. Each links to its source.

  1. Longest Substring Without Repeating Characters
    Hash TableStringSliding Window
    Medium100% asked
  2. Two Sum
    ArrayHash Table
    Easy100% asked
  3. Symmetric Tree
    TreeDepth-First SearchBreadth-First SearchBinary Tree
    Easy89% asked
  4. Number of Islands
    ArrayDepth-First SearchBreadth-First SearchUnion Find
    Medium77% asked

Practice questions in Comcast's style

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

  1. Imagine a Comcast Xfinity customer is reporting intermittent internet connectivity issues on their primary modem. Walk me through how you would debug this problem, considering common causes for such issues in a large ISP environment. What data would you look for first?

    Software EngineerDebugging and TroubleshootingTests: Evaluates systematic problem-solving and understanding of network infrastructure.

  2. We're experiencing high latency for video streaming on our Xfinity Stream app during peak hours in a major metropolitan area. Design a system to identify the bottlenecks. What components would you monitor, and what distributed tracing strategies would you employ?

    Software EngineerSystem Design for PerformanceTests: Assesses ability to design scalable systems and identify performance bottlenecks in a distributed environment.

  3. Write a SQL query to find the top 5 most frequently used channels by Xfinity TV subscribers in a specific zip code during the last month, excluding sports channels. Assume you have tables: `subscribers` (subscriber_id, zip_code), `viewing_history` (viewing_id, subscriber_id, channel_id, timestamp), and `channels` (channel_id, channel_name, category).

    Data ScientistSQL and Data AnalysisTests: Tests SQL proficiency and ability to extract meaningful business insights from structured data.

  4. Comcast is looking to improve the onboarding experience for new Xfinity Internet customers. What are the key success metrics you would track to evaluate the effectiveness of a new onboarding flow?

    Product ManagerMetrics and Success DefinitionTests: Evaluates understanding of product metrics and how to measure user experience improvements.

  5. Design a user interface for a new feature within the Xfinity Home app that allows users to remotely control their smart thermostat. Consider ease of use, accessibility, and common user flows for smart home devices.

    Product DesignerUI/UX Design for Smart HomeTests: Assesses design thinking, user empathy, and ability to create intuitive interfaces for complex products.

  6. How would you market a new Comcast business internet plan targeted at small to medium-sized businesses (SMBs) in a competitive market? What channels would you prioritize and what key value propositions would you highlight?

    MarketingGo-to-Market StrategyTests: Evaluates understanding of market segmentation, channel strategy, and value proposition development.

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

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Comcast Interview Questions (2026) | ZorixOS