Capital One Machine Learning Engineer Interview Questions
Practice the exact questions companies are asking right now.
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Solve OA tasks on string, grid path, subarrays
You are given three independent coding tasks. Task 1: Reverse the middle if ends are vowels Given a string s (ASCII letters), if both the first and la...
Simulate round-robin package assignment to servers
You are simulating a round-robin dispatcher across m servers labeled 0..m-1. - Each server i has an initial remaining capacity cap[i] (a non-negative ...
Validate virtual credit card transactions from encoded IDs
You are designing logic for a virtual credit card product. Part 1: Product reasoning Explain key benefits and drawbacks of virtual credit cards for: -...
Design model deployment, monitoring, and low-latency inference
You have trained a fraud detection model and need to productionize it. Part A: Deployment - How would you deploy an ML model to production? - What art...
Count ordered fragment pairs forming a password
You are given: - A target string password. - A list of N string fragments fragments[0..N-1] (fragments may repeat). Count the number of ordered pairs ...
Compute minutes since last train departure
You are given a daily train timetable as a list of departure times (24-hour format HH:MM). Given the current time (also HH:MM), find the most recent d...
Return all root-to-leaf tree paths
Given the root of a binary tree, return all root-to-leaf paths. - A leaf is a node with no children. - A path should be represented as a string with n...
Support updates and count target-sum pairs
You are given two integer arrays: - A (fixed / primary) - B (modifiable / secondary) You must process a sequence of operations of two types: 1. Update...
Implement string/matrix simulations and counting pairs
You are given several independent implementation-focused tasks. For each task, write a function that returns the required value. Task 1 — Count matchi...
Explain core ML concepts and lifecycle
You are interviewing for an ML Engineer role. Answer the following (conceptually; no code required): 1) Bias–variance tradeoff - What are bias and var...
Answer leadership scenarios with STAR
Answer the following behavioral questions with specific examples from your experience: 1. How did you challenge the status quo? 2. Describe a time you...
Maximize grid-path expression and count sawtooth subarrays
Problem 1: Maximize a valid expression along a grid path You are given an m x n grid grid. Each cell contains either: - an operator: '+' or '-', or - ...
Rotate matrix and find max lamp coverage
1) Square-matrix rotation with extra space: Given an n x n integer matrix, return a new matrix that is the 90-degree clockwise rotation of the input. ...
Solve matrix rotation and 1-D illumination
Question LeetCode 48. Rotate Image – rotate an n×n matrix 90° clockwise (extra space allowed). Find the point(s) with the maximum number of illuminate...
Describe projects, conflicts, and tough stakeholders
Manager (HM) behavioral interview prompt You have a 30–45 minute hiring-manager conversation. Expect a discussion centered on your recent work plus a ...
How would you improve card-type detection?
Scenario You have a service that needs to determine a credit/debit card network/type (e.g., Visa, Mastercard, AmEx, Discover, etc.) from the card numb...