Scale Engineer

Staff Engineer

Software EngineerIC5Hard

This interview process is designed to assess candidates for the Staff Engineer (IC5) role at Reddit. It focuses on deep technical expertise, system design capabilities, leadership potential, and a strong understanding of large-scale distributed systems. Candidates will be evaluated on their problem-solving skills, ability to mentor others, and their alignment with Reddit's culture and values.

Rounds·5

Timeline·~14d

Experience·8 - 15 yrs

Comp band·US$180000 - US$250000

Interview time·270 min

Evaluation

What they measure.

  • Technical depth and breadth in relevant areas (e.g., distributed systems, backend development, data engineering).
  • System design skills, including scalability, reliability, and maintainability.
  • Problem-solving abilities and analytical thinking.
  • Leadership, mentorship, and influence.
  • Communication and collaboration skills.
  • Cultural fit and alignment with Reddit's values.

Preparation

How to prepare.

Tips

  1. Review core computer science fundamentals, especially data structures and algorithms.
  2. Deepen your understanding of distributed systems concepts (e.g., consensus, replication, caching, load balancing).
  3. Practice system design problems, focusing on scalability, reliability, and trade-offs.
  4. Prepare to discuss your past projects in detail, highlighting your contributions and technical decisions.
  5. Familiarize yourself with Reddit's architecture and technical challenges through their engineering blog.
  6. Think about examples of leadership, mentorship, and influencing technical decisions.
  7. Prepare questions to ask the interviewers about the team, technology, and company culture.

Study plan

Fig · Study plan — 05 phases

01 / 05
01

Phase 01 of 05

Data Structures & Algorithms

Weeks 1-2: DSA Fundamentals. Practice LeetCode (medium/hard). Analyze complexity.

Weeks 1-2: Focus on Data Structures and Algorithms. Review fundamental data structures (arrays, linked lists, trees, graphs, hash tables) and algorithms (sorting, searching, graph traversal, dynamic programming). Practice coding problems on platforms like LeetCode, focusing on medium to hard difficulty. Understand time and space complexity analysis.

Questions

Commonly asked.

  • Design a system to handle Reddit's real-time comment updates.
  • How would you optimize the performance of Reddit's feed loading?
  • Describe a time you had to make a significant technical decision with incomplete information.
  • How do you approach mentoring and growing engineers on your team?
  • What are the key challenges in scaling a platform like Reddit?
  • Design a distributed caching system for user sessions.
  • How would you implement a content moderation system at scale?
  • Tell me about a time you disagreed with a technical decision and how you handled it.
  • What are your thoughts on the future of social media platforms and Reddit's role in it?
  • How do you stay up-to-date with the latest technologies and trends?

Locations

Regional differences.

Fig · Regions — 02 locations

01 / 02

Location

San Francisco, CA

Interview focus

Deep dive into distributed systems design and trade-offs.Leadership and mentorship capabilities.Experience with high-traffic web applications.Understanding of Reddit's specific technical challenges and product.Ability to influence technical direction and strategy.

Common questions

  • How would you design a real-time notification system for Reddit's comments section, considering scalability and latency?
  • Describe a complex technical challenge you faced at scale and how you overcame it. What were the trade-offs?
  • How do you approach mentoring junior engineers and fostering a collaborative team environment?
  • Discuss your experience with A/B testing and experimentation frameworks. How would you use them to improve a Reddit feature?
  • What are your thoughts on the current state of web performance and how would you optimize Reddit's frontend for speed and user experience?

Tips

  • Be prepared to discuss specific examples of leading technical initiatives.
  • Demonstrate a strong understanding of system design principles and their application to Reddit's scale.
  • Articulate your approach to mentoring and growing engineering teams.
  • Research Reddit's recent technical blog posts and engineering challenges.
  • Be ready to engage in a high-level architectural discussion.

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.