Capital One full stack engineer interviews cover both frontend and backend topics including API design, database modelling, React or Vue components, and end-to-end system design.
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coding
Hard
Verified Question
#1
1. [CodeSignal] Battery Rotation Scheduler
Category: Array coding problemA remote system uses a circular array of backup generators to sustain a critical task. Each generator can power the system for a fixed number of...Input: Array
Output: Integer
coding
Hard
Verified Question
#2
2. [CodeSignal] Grid Arithmetic Path
Category: Matrix coding problemYou are given a grid where each cell contains either a single digit ('0' to '9') or an arithmetic operator ('+' or '-'). Starting from any cell, you...Input: Matrix (2D array)
Output: Integer
coding
Easy
Verified Question
#3
3. [CodeSignal] Cyclic Consonant Shift
Category: String coding problemYou are given a string s consisting of lowercase English letters. Transform each character using the following rules: - If the character is a vowel...Input: String
Output: Computed result
coding
Medium
Verified Question
#4
4. [CodeSignal] Leftmost Zero Filler
Category: Array coding problemYou are given a binary array slots containing only 0s and 1s, and an array of string commands ops. Apply each command in order: - Command "1": Find...Input: Array of strings
Output: Computed result
coding
Medium
Verified Question
#5
5. [CodeSignal] Matrix Command Engine
Category: Matrix coding problemYou are given a 2D integer array grid of size n x m and an array of strings commands. Apply each command in order: - "reverseRow r": Reverse the...Input: Matrix (2D array)
Output: Computed result
coding
Medium
Verified Question
#6
6. [CodeSignal] Sequential House Builder
Category: Grid/matrix coding problemYou are monitoring cell activations on an infinite integer grid line. Initially, no cells are active. You are given an array queries of distinct...Input: 2D grid
Output: Integer
coding
Easy
Verified Question
#7
7. [CodeSignal] Vowel Enclosed Reversal
Category: Array coding problemYou are given an array of strings text. For each word that starts and ends with a vowel (case-insensitive: a, e, i, o, u), reverse the substring...Input: Array of strings
Output: Computed result
coding
Hard
Verified Question
#8
8. Text Layout Formatter
Category: Graph coding problemYou are formatting a document page. Given paragraphs (a 2D array of words), aligns (alignment per paragraph), and width (maximum characters per...Input: Graph (nodes and edges)
Output: Computed result
coding
Hard
Verified Question
#9
9. [CodeSignal] Round-Robin Package Dispatcher
Category: Trie-based coding problemA logistics platform assigns packages to processing stations in round-robin order. You are given stationCapacity (max packages each station can...Input: Given input
Output: Integer
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