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      Senior .NET Engineer Interview

      May 11, 2025
      Anonymous Interview Candidate
      No offer
      Positive experience
      Average interview

      Application

      I interviewed at ADT

      Interview

      I applied for the position through the company website, and shortly after, HR contacted me to schedule a 30-minute video call. During the call, she asked about my background, why I’m seeking a new opportunity, my salary expectations, and desired benefits. Following that, she scheduled a 45-minute technical interview. This round focused on the basics of .NET troubleshooting and included some straightforward .NET and SQL questions—for example, how to find duplicate emails in an Employee table. I was then moved forward to a second technical round. This interview involved analyzing a multithreading code scenario that simulated traffic lights. The interviewer had a different output from the program than I did, and he asked me to modify the code to match his result. He also asked me to refactor the code and implement custom exception handling. The round concluded with a few SQL questions, such as: Calculating the total salary by department Counting the number of employees in each department Finding the second-highest salary among all employees The final round of the interview was a culture fit.

      Interview questions [1]

      Question 1

      Calculating the total salary by department Counting the number of employees in each department Finding the second-highest salary among all employees
      Answer question