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      Junior Data Engineer Interview

      May 16, 2025
      Anonymous Interview Candidate
      Amsterdam
      No offer
      Positive experience
      Average interview

      Application

      I applied online. The process took 3 weeks. I interviewed at Booking.com (Amsterdam) in Mar 2025

      Interview

      My process began with a 30-minute phone screen with HR to discuss my background, motivations, and general fit. I then had a technical interview with the Team Lead, covering SQL, Python scripting, and data modeling. During that call it became clear they were specifically looking for SAP expertise, which my profile didn’t match, so we agreed the role wasn’t the right fit and I didn’t proceed to the take-home assignment.

      Interview questions [1]

      Question 1

      In SQL Server, what’s the difference between a merge join and a hash join? In what situations would the optimizer pick one over the other—considering things like sorted inputs, memory use, and data volume?
      Answer question