Scale Engineer

Software Engineer

Software EngineerSenior EngineerHard

Comcast's Senior Software Engineer interview process is designed to assess a candidate's technical expertise, problem-solving abilities, system design skills, and cultural fit. The process typically involves multiple rounds, including HR screening, technical interviews focusing on data structures, algorithms, and coding, a system design interview, and a final managerial or behavioral interview.

Rounds·4

Timeline·~14d

Experience·5 - 10 yrs

Comp band·US$130000 - US$180000

Interview time·180 min

Evaluation

What they measure.

  • Technical proficiency in relevant programming languages and technologies.
  • Strong understanding of data structures, algorithms, and software design principles.
  • Ability to design scalable, reliable, and maintainable systems.
  • Effective problem-solving and analytical skills.
  • Clear communication of technical concepts and thought processes.
  • Collaboration and teamwork abilities.
  • Cultural fit with Comcast's values.
  • Leadership potential and mentorship capabilities (for senior roles).

Preparation

How to prepare.

Tips

  1. Review core computer science fundamentals: data structures (arrays, linked lists, trees, graphs, hash maps), algorithms (sorting, searching, graph traversal, dynamic programming), and their time/space complexity.
  2. Practice coding problems on platforms like LeetCode, HackerRank, or AlgoExpert, focusing on medium to hard difficulty.
  3. Study system design principles: scalability, availability, reliability, consistency, CAP theorem, load balancing, caching, databases (SQL vs. NoSQL), message queues, microservices.
  4. Understand common design patterns and architectural styles.
  5. Prepare for behavioral questions by reflecting on past experiences using the STAR method.
  6. Research Comcast's products, services, and company culture.
  7. Prepare thoughtful questions to ask the interviewers.
  8. Ensure your resume highlights relevant experience and achievements.
  9. Practice explaining your thought process clearly and concisely, especially during coding and system design rounds.

Study plan

Fig · Study plan — 04 phases

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01

Phase 01 of 04

Data Structures & Algorithms

Weeks 1-2: DSA fundamentals and practice (2-3 problems/day).

Weeks 1-2: Focus on Data Structures and Algorithms. Cover arrays, linked lists, stacks, queues, trees (binary trees, BSTs, heaps), graphs, hash tables. Practice algorithms like sorting (quicksort, mergesort), searching (binary search), graph traversals (BFS, DFS), dynamic programming, and greedy algorithms. Aim to solve at least 2-3 problems per day, focusing on understanding the underlying concepts and optimizing solutions.

Questions

Commonly asked.

  • Write a function to find the k-th largest element in an unsorted array.
  • Design a rate limiter for an API.
  • How would you design a system to handle real-time notifications for a social media platform?
  • Tell me about a time you disagreed with a technical decision and how you handled it.
  • Explain the difference between TCP and UDP.
  • How do you approach testing a complex distributed system?
  • Describe a situation where you had to mentor a junior engineer.
  • What are the trade-offs of using a microservices architecture?
  • How would you optimize the performance of a web application?
  • Tell me about your experience with cloud computing platforms.

Locations

Regional differences.

Fig · Regions — 03 locations

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Location

Philadelphia, PA (HQ)

Interview focus

System design and architecture for large-scale distributed systems.Deep understanding of cloud-native technologies and best practices.Experience with media streaming technologies and protocols.Leadership and mentorship capabilities.

Common questions

  • How would you design a scalable video streaming service for millions of users?
  • Describe a complex technical challenge you faced and how you overcame it.
  • Discuss your experience with cloud platforms like AWS, Azure, or GCP.
  • How do you ensure code quality and maintainability in a large project?
  • What are your thoughts on microservices architecture vs. monolithic architecture?

Tips

  • Familiarize yourself with Comcast's specific technologies and services, especially in media and entertainment.
  • Be prepared to discuss your experience with large-scale, high-availability systems.
  • Highlight any experience with content delivery networks (CDNs) and video encoding/decoding.
  • Showcase your ability to lead technical discussions and mentor junior engineers.

Rounds

Round-by-round.

Expand a step for evaluation criteria, sample questions, and prep notes.

DSA

Coding questions at Comcast.

Frequently reported on Comcast loops

View all at Comcast

Other guides

More at Comcast.