Reddit Software Engineer Interview Questions
Reddit Software Engineer interviews include coding rounds on algorithms/data structures, a system design round focused on high-traffic content/comment systems, and behavioral interviews on collaboration and community-mindedness. Expect 2 coding rounds, one system design round, and one behavioral round across a 4-round loop.
What to Expect
| Category | Focus Areas | Difficulty Mix | Typical Weight |
|---|---|---|---|
| Coding | Data structures, algorithms, complexity analysis | Medium-Hard | 35% |
| System Design | Feed ranking, comment threading, caching at scale | Medium-Hard | 30% |
| Behavioral | Collaboration, ownership, community focus | Easy-Medium | 20% |
| Domain Knowledge | Content moderation systems, API design | Easy-Medium | 15% |
Interview Stage Breakdown
| Stage | Format | Duration | What's Assessed |
|---|---|---|---|
| Recruiter Screen | Phone | 30 min | Background, role fit |
| Technical Phone Screen | Video | 45-60 min | Coding fundamentals |
| Onsite (3 rounds) | Video/Panel | 3 hrs | Coding, system design, behavioral |
Prep Tips
- Practice medium/hard coding problems on trees, graphs, and hash maps, common for feed/threading logic.
- Review system design for high-read, high-write content systems: feed ranking, comment trees, and caching.
- Prepare a behavioral story showing how you balanced fast iteration with system reliability.
- Study basic content moderation and abuse-prevention system concepts.
FAQs
How does Reddit's coding bar compare to larger tech companies? It's comparable to mid-size to large tech companies, with medium to hard difficulty problems.
Is content moderation experience required? It's a plus for trust-and-safety-adjacent teams but not required for most engineering roles.
How many rounds should I expect total? Typically a recruiter screen, technical phone screen, and 3 onsite rounds.
What system design topics come up most? Feed ranking, comment threading at scale, and caching strategies are the most common themes.
Is there a take-home assignment? It varies by team; some use a take-home coding exercise as part of the process.
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