HubSpot data analyst interviews focus on SQL, data visualisation, business metrics, statistical analysis, and translating data insights into actionable recommendations.
1. OA[CodeSignal] Cloud File Storage System
Category: Graph coding problem
Question Your task is to implement a simple in-memory cloud storage system that maps objects (files) to their metadata (name, size, etc.). You...
Input: Graph (nodes and edges)Output: Array
2. OA[CodeSignal] Design Banking System
Category: Graph coding problem
Question Design a banking system that supports account management, transactions, and various financial operations.
Input: Graph (nodes and edges)Output: Computed result
3. OA[CodeSignal] In-Memory Database
Category: Graph coding problem
Description Implement a simplified in-memory database that supports record manipulation with various operations. The system should handle basic...
Input: Graph (nodes and edges)Output: Array
4. Service Log Aggregator
Category: Trie-based coding problemA distributed system emits log entries from multiple services and worker threads. Each log entry is a colon-separated string in the format...Input: Array
Output: Computed result
5. Top Recurring Substring
Category: Graph coding problemA search analytics service needs to find which fixed-length pattern occurs most often in a block of text. Given a lowercase string
s and a positive...Input: Graph (nodes and edges)Output: Computed result
6. Arithmetic Expression Tree
Category: Binary tree coding problemYou are given a mathematical expression encoded as a binary tree in JSON format. Evaluate the expression and return its integer result. Each node in...Input: Binary tree
Output: Computed result
7. Event Participant Role Validator
Category: Trie-based coding problem
Question A conference platform manages associations between events, attendees, and their roles. Each association is represented by three strings:...
Input: ListOutput: Array
8. Team Standup Scheduler
Category: Algorithm coding problem
Question A remote-work platform needs to schedule weekly standups for distributed teams. Each team member provides a list of dates (formatted as...
Input: ListOutput: Array
9. Peak Stream Viewer Tracker
Category: String coding problem
Question A streaming analytics platform needs to track peak viewership for each user on each day. You are given a list of Session records. Each...
Output: Computed result
10. Top Frequency Substring
Category: Graph coding problemGiven a string
text containing only lowercase English letters and a positive integer k, find the substring of length k that appears most...Input: Graph (nodes and edges)Output: Computed result
11. [CodeSignal] Contact Role Capacity Validator
Category: String coding problemA platform tracks permission assignments between departments, employees, and their access levels. Each assignment is represented by three strings:...Input: List
Output: Array
12. [CodeSignal] Country Meeting Date Finder
Category: Algorithm coding problemA global organization is scheduling regional check-ins for its distributed teams. Each team member belongs to a region and provides a list of...Input: List
Output: Array
13. [CodeSignal] Customer Peak Call Tracker
Category: String coding problemA billing platform tracks user sessions for resource usage metering. Each session record contains: - userId: an integer identifying the user. -...Input: List
Output: Computed result
14. Expression Tree Calculator
Category: Tree coding problemGiven a mathematical formula represented as a JSON object, compute its result. The formula is encoded as a recursive expression tree with two node...Input: Integer(s)
Output: Computed result
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