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      Senior Software Engineer Interview

      Jun 12, 2026
      Anonymous employee
      Boston, MA
      Accepted offer
      Positive experience
      Average interview

      Application

      I interviewed at Keystone (Boston, MA)

      Interview

      Process was organized and professional. It included a recruiter screen, a technical interview, additional fit/problem-solving interviews, and final discussions with the team. The technical interview was not LeetCode-style. It focused on practical Python/data work using Pandas: reading CSV/JSON data, parsing dates, cleaning and transforming data, grouping results, working with dictionaries/lists/dataframes, and drawing conclusions from messy datasets. Overall, the process felt more analytical and data-crunching focused than traditional software engineering.

      Interview questions [1]

      Question 1

      Using Python and Pandas, read a CSV file, parse dates, clean the data, group records by a field, and calculate aggregate statistics from the results.
      Answer question