Type · Coding
Given a list of user interactions (e.g., upvote, downvote, comment, post) with timestamps, write a function to reconstruct a user's likely browsing session. Define what constitutes a 'session' and handle edge cases.
How to Pass the Reddit Software Engineer Interview in 2026
The Reddit DNA (TL;DR)
Reddit assesses product sense and technical depth, evaluating how candidates build for communities and scale features like r/popular. Expect system design and behavioral questions grounded in Reddit's unique culture.
The Reddit Interview Loop
Your onsite loop will typically consist of 5 rounds.
- 1
Round 1
Recruiter ScreenMotivation, role fit, logistics. - 2
Round 2
Coding ScreenLeetCode-medium algorithmic problems under time pressure. - 3
Round 3
System DesignDistributed systems, trade-offs at scale, architecture under constraints. - 4
Round 4
Onsite CodingLeetCode-hard, debugging, code clarity, edge cases. - 5
Round 5
Behavioral / LeadershipPast evidence of ownership, influence, resolving conflict.
The Danger Zone: Top Reasons Candidates Fail
Based on our database of Reddit interview outcomes, avoid these common traps:
- Assuming the array is fully sorted when it's not.
- Failing to articulate their specific actions and contributions.
- Implementing a single-node rate limiter.
- Describing a situation where they were simply assigned tasks, not true ownership.
Test Yourself: Real Reddit Questions
Three real prompts pulled from our database.
Type · System Design
Design a distributed rate limiter for API requests to Reddit's backend services. Consider different algorithms and how to handle distributed state.
Type · Algorithmic
Given a stream of user posts, design an algorithm to detect and flag potentially duplicate or near-duplicate content in real-time. Consider efficiency and memory constraints.
+ many more questions, signals, and worked examples
Sign up to unlock the full Reddit grading rubric
Reddit Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 20 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
Why are you interested in working at Reddit, specifically within our SaaS offerings?
2
Coding Screen
3- 2
Type · Algorithmic
Given a stream of user posts, design an algorithm to detect and flag potentially duplicate or near-duplicate content in real-time. Consider efficiency and memory constraints. - 3
Type · Algorithmic
Implement a function to find the k most frequent words in a large corpus of Reddit comments. Assume the corpus is too large to fit into memory. - + 1 more questions in this round (sign up to unlock)
3
System Design
4- 4
Type · System Design
Design a system to recommend relevant subreddits to new users based on their initial interactions and profile information. - 5
Type · System Design
Design a real-time notification system for Reddit. Users should receive notifications for new replies, mentions, and upvotes on their posts. Consider delivery guarantees and latency. - + 2 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · Coding
Given a list of user interactions (e.g., upvote, downvote, comment, post) with timestamps, write a function to reconstruct a user's likely browsing session. Define what constitutes a 'session' and handle edge cases. - 7
Type · Coding
You are given a large, unsorted array of post IDs. Implement a function to find if a specific post ID exists within the array, optimizing for the case where the array might be partially sorted or have clusters of similar IDs. Discuss trade-offs. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
9- 8
Type · Past Experience
Tell me about a time you had to influence a team or stakeholders who were resistant to your product ideas. How did you approach it, and what was the outcome? - 9
Type · Conflict Resolution
Tell me about a time you had a significant disagreement with a cross-functional partner (e.g., Engineering, Marketing, Design). How did you resolve it? - + 7 more questions in this round (sign up to unlock)
Unlock all 20 Reddit questions, free
No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.
Interview tracks at Reddit
How Reddit's DNA translates across functions. Pick your role.
Compare Reddit with similar employers
Same DNA, different bar. Browse the closest companies in our database and see how their loops differ.
Coverflex
Same tierThe technical assessment at Coverflex grades for a candidate's ability to drive tangible improvements to the Piattafo...
See Coverflex interview questions
Granola
Same tierThe "User Interview Pitch Standup" round at Granola evaluates a candidate's ability to quickly synthesize user needs ...
See Granola interview questions
LaGrowthMachine
Same tierTheir focus on 'Call Booked' metrics and the effectiveness of 'Magic Messages' in their Email Sales Automation Tool d...
See LaGrowthMachine interview questions
Practice Reddit interviews end-to-end
Reddit Mock Interview
Run a live mock interview with our AI interviewer using Reddit-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
Open
STAR Stories for Reddit Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Reddit interviewers grade on. Reuse them across every behavioral round.
Open
Reddit Interview Prep Hub
The frameworks behind every Reddit round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.
Open
Interview Frameworks
CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make Reddit interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.
Open
Sample answers
What a strong answer to these Reddit interview questions shows.
Given a list of user interactions (e.g., upvote, downvote, comment, post) with timestamps, write a function to reconstruct a user's likely browsing session. Define what constitutes a 'session' and handle edge cases.
A strong answer shows: Clear definition of session boundaries.; Efficient data processing and grouping.; Handling of time-series data and potential inconsistencies..
Design a distributed rate limiter for API requests to Reddit's backend services. Consider different algorithms and how to handle distributed state.
A strong answer shows: Algorithms like token bucket or leaky bucket.; Use of distributed coordination services (e.g., ZooKeeper, Redis).; Strategies for handling burst traffic..
FAQ
Explore careers on Workfive →