Scale Engineer

Senior Software Engineer

Software EngineerIC4Hard

This interview process is designed to assess candidates for the Senior Software Engineer (IC4) role at Reddit. It evaluates technical proficiency, problem-solving skills, system design capabilities, and cultural fit within the company.

Rounds·4

Timeline·~14d

Experience·5 - 10 yrs

Comp band·US$170000 - US$220000

Interview time·180 min

Evaluation

What they measure.

  • Problem-solving approach and clarity of thought.
  • Code quality, efficiency, and correctness.
  • Understanding of data structures and algorithms.
  • Ability to design scalable and robust systems.
  • Communication skills and ability to articulate technical concepts.
  • Collaboration and teamwork potential.
  • Cultural alignment with Reddit's values.

Preparation

How to prepare.

Tips

  1. Review fundamental computer science concepts (data structures, algorithms, operating systems, databases).
  2. Practice coding problems, focusing on common patterns and complexities.
  3. Study system design principles and common architectural patterns.
  4. Prepare to discuss your past projects and technical challenges in detail.
  5. Research Reddit's products, culture, and recent news.
  6. Prepare questions to ask the interviewers about the role, team, and company.

Study plan

Fig · Study plan — 04 phases

01 / 04
01

Phase 01 of 04

Data Structures & Algorithms

Weeks 1-2: DSA fundamentals and practice (Easy/Medium).

Weeks 1-2: Focus on Data Structures and Algorithms. Cover arrays, linked lists, trees, graphs, hash tables, heaps, sorting, searching, dynamic programming, and greedy algorithms. Practice problems on LeetCode (Easy to Medium).

Questions

Commonly asked.

  • Design a system to handle Reddit's real-time notifications.
  • How would you implement a feature like Reddit's 'popular' feed?
  • Describe a time you disagreed with a technical decision. What did you do?
  • What are the trade-offs between SQL and NoSQL databases for a platform like Reddit?
  • How would you optimize the performance of a large-scale web application?
  • Tell me about a project you are particularly proud of.
  • How do you stay updated with new technologies?
  • What are your thoughts on microservices architecture?
  • How would you design a rate limiter for API requests?
  • Describe a situation where you had to mentor a junior engineer.

Locations

Regional differences.

Fig · Regions — 02 locations

01 / 02

Location

San Francisco

Interview focus

Emphasis on distributed systems and scalability relevant to Reddit's user base.Understanding of large-scale data processing and real-time systems.Experience with A/B testing and experimentation.

Common questions

  • How would you design a URL shortener for Reddit?
  • Discuss a time you had to deal with a production issue. What was your approach?
  • What are your thoughts on the current state of web development frameworks?

Tips

  • Familiarize yourself with Reddit's architecture and common challenges.
  • Be prepared to discuss your contributions to open-source projects.
  • Highlight experience with high-traffic websites and applications.

Rounds

Round-by-round.

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

DSA

Coding questions at Reddit.

Frequently reported on Reddit loops

View all at Reddit

Other guides

More at Reddit.