Reddit software engineer interviews cover algorithms, data structures, system design, and coding problems drawn from real interview rounds.
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coding
Hard
Verified Question
#1
1. Ping-Pong Match Scorer
Category: String coding problemYou are building a scoring system for competitive ping-pong matches. Points are awarded one at a time to a player, and the score must be tracked...Input: String
Output: Computed result
coding
Hard
Verified Question
#2
2. Admin Permission System
Category: Trie-based coding problemYou are designing a system that tracks administrator privileges for an online platform using a time-ordered log of administration actions. Each log...Input: List
Output: Computed result
coding
Hard
Verified Question
#3
3. Expense Ledger
Category: Graph coding problemA company's expense tracking database was lost. Fortunately, a complete historical log of all financial transactions was retained. Your task is to...Input: Graph (nodes and edges)
Output: Computed result
coding
Hard
Verified Question
#4
4. Document Context Merger
Category: Trie-based coding problemA document review application maintains a history of entries where each entry is identified by a unique, strictly increasing integer
id and...Input: ListOutput: Array
coding
Hard
Verified Question
#5
5. Org Chart Navigator
Category: Tree coding problemA company's reporting structure is described as a list
relationships, where each element is a list of strings. The first string represents a...Input: Array of stringsOutput: Array
system design
Hard
Verified Question
#6
6. Top 5 Reddit System Design Questions
Category: Trie-based system design problem
System Design Questions - Reddit These are the most commonly asked system design questions from Reddit interviews.
Input: Number(s)Output: Computed result
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