Reddit Coding Interview Questions
We track 5 coding questions asked at Reddit, tagged with the algorithms and concepts they test. The most common: Hash Table, Breadth-First Search, Design, Doubly-Linked List, Enumeration.
Browse all 5 Reddit questions →Concept mix
Each question's weight is split evenly across its concepts, so the shares sum to 100%.
- Hash Table19.4%
- Enumeration16.7%
- Math16.7%
- Breadth-First Search11.1%
- String11.1%
- Design8.3%
- Doubly-Linked List8.3%
- Linked List8.3%
How many questions involve each concept
Share of all 5 tracked Reddit questions that touch each concept. Questions usually involve several, so these overlap.
- Hash Table40.0%
- Breadth-First Search20.0%
- Design20.0%
- Doubly-Linked List20.0%
- Enumeration20.0%
- Linked List20.0%
- Math20.0%
- String20.0%
Where Reddit differs from the average company
Concept weight at Reddit relative to the average across all companies we track. Green means Reddit leans on it harder than most.
- Hash Table2.9×
Reddit specialties
Concepts that show up at Reddit but are rarely asked elsewhere. They are easy to get blindsided by.
Difficulty mix
Level split of the 5 tracked Reddit questions.
- Junior20% (1)
- Mid/Senior60% (3)
- Staff20% (1)
Every concept in Reddit interviews
| Concept | Questions | % of questions | Share of mix |
|---|---|---|---|
| Hash Table | 2 | 40.0% | 19.4% |
| Breadth-First Search | 1 | 20.0% | 11.1% |
| Design | 1 | 20.0% | 8.3% |
| Doubly-Linked List | 1 | 20.0% | 8.3% |
| Enumeration | 1 | 20.0% | 16.7% |
| Linked List | 1 | 20.0% | 8.3% |
| Math | 1 | 20.0% | 16.7% |
| String | 1 | 20.0% | 11.1% |
Practice a Reddit interview
Take a realistic AI-led mock interview with questions Reddit actually asks, with live voice and real feedback.
Start a mock interviewYour first interview is free · no credit card required