HubSpot mobile engineer interviews focus on iOS or Android platform knowledge, memory management, offline-first architecture, and mobile-specific system design.
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coding
Hard
Verified Question
#1
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
coding
Hard
Verified Question
#2
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
coding
Hard
Verified Question
#3
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
coding
Medium
Verified Question
#4
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
coding
Easy
Verified Question
#5
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
coding
Medium
Verified Question
#6
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
coding
Hard
Verified Question
#7
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: List
Output: Array
coding
Medium
Verified Question
#8
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: List
Output: Array
coding
Hard
Verified Question
#9
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...Input: ListOutput: Computed result
coding
Easy
Verified Question
#10
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
coding
Medium
Verified Question
#11
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
coding
Medium
Verified Question
#12
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
coding
Medium
Verified Question
#13
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
coding
Medium
Verified Question
#14
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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