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      Capital One

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      Software Engineer Interview

      29 Oct 2019
      Anonymous interview candidate
      McLean, VA
      No offer
      Positive experience
      Difficult interview

      Application

      I applied through a recruiter. The process took 2 weeks. I interviewed at Capital One (McLean, VA) in Oct 2019

      Interview

      On sight interview experience as follows: 1. Wait in the lobby with other interns until currently employed engineers come 2. The engineers come, take you to lunch, and talk about their experience at Capital One. Most of them had worked for Capital One less than 5 years and had previous internship experience so they were really cool about answering questions and describing their honest experience (the good and the bad), so don’t be afraid to ask questions! I’ll help ease your tension before the interviews. 3. Then, you take a tour of the building. Really cool, helped relax before the interviews. 4. The engineers lastly drop you off to the interview wing. Yes, expect a whole section of the building designed just to interview people in. It had snacks, coffee, and the bathrooms were stocked with things like deodorant just in case you were nervous and needed something. They then show you to your assigned room, which you stay in the entire time (all 3 interviews). In the room is your schedule (mine went Case, Technical, Behavioral) in order. The room also has a wipe board, calculator, paper etc fully equipped for your interview. I had never had such an intense interview before so it made me nervous, but now you know what to expect. I also have given a full description of all of the questions below that I was asked, plus a few important tips! Also, if you are not chosen to move forward, you receive no feedback as to why, which is unfortunate so expect that.

      Interview questions [7]

      Question 1

      Case - You are given a description of Capital One wanting to acquire a company that moved into the digital space (online banking). You’re asked many questions about the situation: Why would Capital One want to do this? What would be the way they would go about integrating systems? What would be the pros and cons? It’s a very abstract question and you will be given no indication if you’re correct or not. Study up on business integration and how companies integrate tech systems.
      Answer question

      Question 2

      Case - Given code on a piece of paper, how would you go about explaining what this code does to someone who isn’t an engineer? Basically, you’ll want to trace the code and draw a diagram or something. In my interview the code had statements that didn’t execute, they’ll expect you to be able to identify that and thus they’ll expect you to correct the code.
      Answer question

      Question 3

      Tech - Design a banking system that allows for withdrawals, deposits, multiple types of accounts (checking, savings) and also keeps track of all transactions up to 6 months. I believe they’re looking for a UML diagram or something of that nature so STUDY how you would draw up classes and inheritance without actually coding.
      Answer question

      Question 4

      Tech - Given an input in string form of “01-10-2018” convert that into “January 10th” form. Make sure you add the “th” “rd” etc at the end. Both outputs must be string.
      Answer question

      Question 5

      Behavioral- Describe a time you had to explain something technical to a non technical person. To give an example, the first time I answered this question I told them about how I had to explain the essence of why we use data structures to my mom, but that was WRONG. My interviewer stopped me and explained that it needed to have much more detail and reflective material so make sure you have a deep, cohesive example that you can reflect on easily. They will ask follow up questions like “how did you know they understood your explanation?” etc.
      Answer question

      Question 6

      Behavioral - Talk about one of your greatest accomplishments. What did you learn about yourself? Looking back would you have done anything any differently? Be super reflective and deep about all of your answers, don’t be cookie cutter.
      Answer question

      Question 7

      Behavioral - Tell me about a time you learned something new. There will also be a lot of follow up questions about this so be prepared to be reflective and asked for details. Key key key: do not be shallow, did deep and find complex examples.
      Answer question
      31

      Other Software Engineer interview reviews for Capital One

      Software Engineer Interview

      3 Jun 2026
      Anonymous interview candidate
      No offer
      Neutral experience
      Difficult interview

      Application

      I interviewed at Capital One

      Interview

      4 rounds of interview including coding , design , case study, behavioral after clearing the code signal assesment. Coding was medium hard of 2 questions each. case study and system design was difficult.

      Interview questions [1]

      Question 1

      focus on designing and case study
      Answer question

      Software Engineer Interview

      20 May 2026
      Anonymous interview candidate
      No offer
      Neutral experience
      Difficult interview

      Application

      I interviewed at Capital One

      Interview

      This took a bit longer than expected, stretching over several weeks. The technical rounds were intense, featuring an LRU cache implementation and a problem on detecting duplicate transactions within a 60-second window. I was nervous at first, but it clicked for me when I realized I had practiced a similar approach on PracHub just days before. Unfortunately, I didn’t receive an offer in the end, but the experience was a solid learning opportunity. The behavioral questions felt straightforward, so I wish I had made a stronger impression in the technical segments.

      Interview questions [2]

      Question 1

      Implement an LRU cache with get and put operating in O(1)
      Answer question

      Question 2

      Given a stream of transactions, detect duplicates within a 60-second window
      Answer question

      Software Engineer Interview

      14 Apr 2026
      Anonymous employee
      Accepted offer
      Positive experience
      Average interview

      Application

      I interviewed at Capital One

      Interview

      Un proceso largo, pero sin mucha complicación en el proceso. Empresa atenta en todo momento a dudas y disponibilidad de tiempo para las entrevistas. Exámenes con temas sencillos y complejos. Variedad en los ejercicios