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      Senior Software Engineer I Interview

      2 Mar 2025
      Anonymous interview candidate
      Declined offer
      Positive experience

      Other Senior Software Engineer I interview reviews for Checkout.com

      Senior Software Engineer Interview

      12 Apr 2026
      Anonymous employee
      Tallinn
      Accepted offer
      Average interview

      Application

      I interviewed at Checkout.com

      Interview

      (London) Great experience with constant communication and thorough preparation before each round. The process consists of four steps: An initial call with a recruiter to better understand the position and assess the fit for the role. A technical screening with a series of questions about past experience, typical challenges faced as an engineer, best practices, etc. It might initially seem like a checklist, but it is actually open-ended. A coding round, which can be either a take-home task or a live coding session. I chose the take-home task, which took me about 5–6 hours to complete. The key here is not to overthink or overengineer. This is followed by a live questioning session about improvements and design decisions (again, very open-ended). The final round involves visiting the office (a rare experience nowadays) for an onsite system design interview, where I built a payment gateway, followed by a behavioral interview. It’s important to have a solid understanding of distributed systems and to brush up on security topics such as authentication, encryption, backups, etc. Overall, all interviewers were supportive and interactive. Communication was clear, and the offer was competitive, but I ultimately decided to accept an offer from my dream company.

      Interview questions [1]

      Question 1

      Q: What techniques would you use to improve resilience when calling an external service?
      1 Answer
      3
      Positive experience
      Difficult interview

      Application

      I applied through a recruiter. I interviewed at Checkout.com (Tallinn) in Feb 2026

      Interview

      The best interview process that I had so far . Starts with a survey after the recruiter screening which is very detailed for the candidates to align with the company culture, with a clear feedback on the end. The challenge at home with a task that makes sense for the domain of the company was the next one, followed by a live explanation of the project I liked much more than the traditional pair programming rounds, as it removes a bit the pressure of live coding which eventually brings problems totally disconnected of the position that we are applying and gives you the time to discuss your solution with the interviewers afterwards. The final stages, system design and values interview in person are much more enjoyable and feels more like a workday at the office with a colleagues than live interviewers made on-line.

      Senior Software Engineer Interview

      10 Dec 2025
      Anonymous interview candidate
      No offer
      Negative experience
      Difficult interview

      Application

      I interviewed at Checkout.com

      Interview

      Up until the system design it was really friendly. Then it became the most embarrassing interview I’ve ever had. The guy visually facepalmed and laughed if I said something he didn’t like. Asking a lot of trick questions and said hashing the API Key when storing in the database doesn’t make any sense. 😆

      Interview questions [1]

      Question 1

      Why would you hash an API key when storing in the DB?
      Answer question
      7

      Senior Software Engineer I Interview

      19 Aug 2025
      Anonymous interview candidate
      London, England
      No offer
      Negative experience
      Difficult interview

      Application

      I applied through a recruiter. I interviewed at Checkout.com (London, England) in Aug 2025

      Interview

      I had a first-round interview with talent acquisition, followed by a take-home test, and finally an in-person interview focused on system design. During all three steps, I received positive feedback. However, after a call from the HR team informing me that I had successfully passed all the steps, they suddenly told me I was not successful due to some gaps in system design and the coding challenge from the second-round interview. This felt quite strange; it seemed like they didn't know what they were doing. It is possible to successfully pass all interview stages and still not progress with your application, which I find unprofessional.

      Interview questions [1]

      Question 1

      Design a system that processes payments and communicates with two third-party providers, such as a bank and an inventory system.
      Answer question
      3