It’s essential for an interviewer to take some form of notes during an interview. These notes can be turned into a formal write-up, ideally as soon as possible after the interview itself. New interviewers should typically budget about the same length of time for their write-up as they spent on the interview, although with a great deal of practice and good in-interview note-taking, the time commitment will go down by half or more.
Good notes capture the questions that were asked and give a high-level description of what happened during the interview, including both candidate answers and any key moments in the discussion.
When interviews include coding questions, a complete report will capture the candidate’s written code, to allow the hiring team to objectively evaluate the results and consistently calibrate the process. A complete and final write-up will include a high-level assessment of the code quality.
Some interviewers are able to capture more detailed quotes while the interview progresses. This makes reconstructing the interview and creating a good write-up easier and can be particularly useful for folks whose schedules preclude a full write-up immediately following the discussion. However, note that good interviewers will only take down this level of detail if they can simultaneously stay engaged with the candidate.