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      Junior Data Scientist Interview

      10 Jan 2024
      Anonymous interview candidate
      No offer
      Negative experience
      Average interview

      Application

      I applied online. The process took 2 weeks. I interviewed at CHECK24

      Interview

      I underwent a two-stage interview process, both sessions conducted by two technical leads from the team. The initial round, lasting approximately 30 minutes, covered fundamental aspects of software development, inquiries about my Git proficiency, and discussions about my previous experiences. Following this, I received positive feedback and an invitation to the second round, which was specifically focused on technical aspects. To my surprise, the second round mirrored the first, with the same set of questions being posed by the same interviewers. Initially, I thought this might be a way to test if I my answers were consistent. However, it became evident that they hadn't taken notes from the initial round and were unaware that they were repeating questions. This lack of preparation gave the interview an odd sense of déjà-vu during the first half-hour. The technical portion of the interview commenced after this period, and despite having submitted my CV in advance, it seemed the interviewers had not reviewed it thoroughly. They posed questions unrelated to the information provided in my CV, making it challenging for me to respond accurately. After several unanswered questions, the interview was ultimately canceled.

      Interview questions [2]

      Question 1

      In Python, what is a call stack and what would you use it for?
      Answer question

      Question 2

      What is the proper workflow when using Git in a collaborative setting?
      Answer question
      2

      Other Junior Data Scientist interview reviews for CHECK24

      Junior Data Scientist Interview

      2 Jun 2026
      Anonymous interview candidate
      Münster, North Rhine-Westphalia
      No offer
      Negative experience
      Average interview

      Application

      I applied online. I interviewed at CHECK24 (Münster, North Rhine-Westphalia) in Feb 2026

      Interview

      Ich wurde von einem Recruiter auf LinkedIn angeschrieben, habe dann meine Bewerbung hochgeladen und hatte ein virtuelles Meeting mit der Geschäftsführung. Danach wurde ich für einen halben Tag nach Münster zum Unternehmen eingeladen. Leider habe ich danach wochenlang nichts mehr gehört und nach mehrmaligem Vertrösten wurde mir mitgeteilt, dass es wohl aktuell keine Entscheidung geben wird (vermutlich wird die Stelle gestrichen/nicht mehr besetzt). Absolut schlechte Kommunikation von der Geschäftsführung. Immerhin war der Kontakt mit HR angenehm und freundlich.

      Interview questions [1]

      Question 1

      Wo siehst du bei uns Potenzial für datengestützte Anwendungen? Welche Features/ Änderungen würdest du vornehmen?
      Answer question

      Junior Data Scientist Interview

      14 Oct 2025
      Anonymous interview candidate
      Munich, Bavaria
      No offer
      Negative experience
      Easy interview

      Application

      I applied online. The process took 2 weeks. I interviewed at CHECK24 (Munich, Bavaria) in Oct 2025

      Interview

      1 hour long technical interview right after applying to the position so there was no HR interview. The interviewer came couple of minutes late to the meeting and lacked common courtesy. I felt like I was wasting his time and I was only interviewed to get rejected. I got interrupted couple of times while speaking and commanded to tell about something else. After 15 minutes of introduction of the company, myself etc. the technical part started. Interviewer asked about extremely basic concepts about Python, which I found it odd since one of the requirements for the position is to have a Master's Degree. I failed to answer some, and after he corrected me and I acknowledged the correct information, he always followed up with "but you just said it was not" by pointing out my wrong answer. Later, he shared his screen and asked the print of bunch of small tricky Python code snippets. Same behaviour happened for this part here as well, he never affirmed a correct answer from me and always stressed the wrong parts. One of the questions was "will the brackets be printed for a list?", I cannot think of a correlation between this information and the actual responsibilities of the position. Only in the last 5 minutes, he glanced to my CV, asked the first question related with ML&DS, which is a class imbalance scenario. After I correctly and througly answered, he said "everyone would know that" and asked something further on the same topic, I answered that correctly as well. Final question was related with CNNs, he tried to come up with a question in the moment which lacked context and displayed lack of preparation. When I asked about more context to be able to answer the question, he seemed frustrated and didn't try to elaborate more. I half-answered his question then the interview was over. Easily the worst technical interview that I ever had, whole technical part could be done over an online short questionnaire. I was prepared to talk about more advanced topics and ML&DS problems, not to answer some tricky syntax questions like one would do when they are looking for their first internship while they are in 2nd year of their Bachelor's etc.

      Interview questions [1]

      Question 1

      What happens when you try to train a classifier on a data of 10k dogs and 100 cats?
      Answer question

      Junior Data Scientist Interview

      15 Sept 2025
      Anonymous interview candidate
      No offer
      Neutral experience
      Average interview

      Application

      I applied online. The process took 1 week. I interviewed at CHECK24 in Sept 2025

      Interview

      Das Gespräch begann mit einer kurzen Vorstellungsrunde, in der ich meinen Werdegang und meine Motivation darlegen konnte. Anschließend wurden mir einige Logikfragen gestellt, um mein analytisches Denken zu prüfen. Danach folgten Fragen zu Python-Theorie sowie Aufgaben, bei denen ich Python-Code erklären und das erwartete Output beschreiben sollte. Zum Schluss gab es Fragen zu Machine-Learning-Theorie

      Interview questions [1]

      Question 1

      F: Können Sie erklären, wie ein LSTM funktioniert und wofür man es im Vergleich zu einem normalen RNN einsetzt
      Answer question