Docusign Senior Software Developer interview questions

Questions were neither too easy, not too difficult. Was asked a design question over the phone when doing a phone interview. Provided the solution, was later asked to submit the working code for it, which I did. Later was asked for on-site interview. Met with 4 people, 2 at a time. Each pair of engineers interviewed me for an hour. Expect to be asked to solve string manipulation problems. I guess that's what they do a lot at work there... or maybe not.