Associate Software Engineer
Sum Digits Until One Digit
Given a non-negative integer, repeatedly sum its digits until the sum is a single digit. Describe your thought process and the approach you would take to solving this problem.
This question was asked in
Charles Schwab Associate Software Engineer Interview Experience
The interview process at Charles Schwab consisted of two rounds focusing on coding and behavioral questions. In the first round, candidates were asked to solve a problem regarding summing digits of a number until a single digit remains, along with behavioral questions on stress management. The second round continued with behavioral questions centered on handling difficult clients and delivering bad news. Overall, the experience appeared to be moderately challenging, emphasizing problem-solving and interpersonal skills.