Capital One

Role: Fullstack Mid-level SE

College: Not Specified

Interview Date: June 2025

Interview Type: Full-Time

Result: Not Specified

Difficulty: Medium (implied, with some challenging aspects)

Rounds: Online Assessment + Power Day (4 rounds)

Topics Asked: Data Structures, Algorithms, Object-Oriented Programming, System Design, Behavioral, Case Study

Experience:

The candidate, with over 4 years of experience, underwent an Online Assessment (OA) followed by a Power Day consisting of four rounds.

The OA included three coding questions. The first two were foundational, with the third building upon them. One specific OOP problem involved parsing transaction data into a chosen data structure, writing functions to manipulate it (e.g., sort by date, company, cashback offer), and explaining time/space complexity.

The Power Day comprised a Technical Case, a Coding Question, a System Design round, and a Behavioral interview.

The Technical Case presented a real Capital One problem, requiring the candidate to explain existing code, solve simple math problems related to it, and implement basic logic. Discussions also included "Virtual Credit Number initiatives and its pros and cons and how it would be implemented."

The Coding Question focused on Object-Oriented Programming, specifically "Designing a simple bank account class with deposit, transfer, and withdraw functionality." The interviewer emphasized the thought process and handling edge cases over complete implementation.

The System Design round involved designing a credit card application site (login, user creation, application), a banking app, or a smart electric meter system for an apartment building, focusing on high-level design, scalability, and AWS integration.

The Behavioral round followed the STAR format, with questions like "Tell me about a time to learn something new," "Time you had conflict with teammate," "How did you challenge a manager/mentor," "Your weakness/strength," and "Why do you want to work at Capital One."