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      Testsigma

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      Senior Backend AI Engineer Interview

      14 Nov 2025
      Anonymous interview candidate
      Declined offer
      Negative experience
      Average interview

      Application

      I applied through a recruiter. The process took 2 weeks. I interviewed at Testsigma in Nov 2025

      Interview

      Cleared both technical rounds with positive feedback. The interviewers in the early rounds were professional and great to speak with. However, during the final discussion with the co-founder, the compensation that I had already shared and was told was acceptable at the start was suddenly considered “too much,” with unnecessary comments about lifestyle and cost of living. This should have been clarified upfront instead of after all rounds. Overall, it felt like a waste of time due to lack of transparency. Proceed only if you get compensation alignment in writing before interviewing.

      Interview questions [1]

      Question 1

      Given two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicates) is included in the window. If there is no such substring, return the empty string design github copilot
      Answer question

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