The technical code screening and system design were both outsourced by a company called Karat. I did not interact with anyone from OnePay beyond the initial phone screening with the recruiter. The interviewer read off a script, showed little interest in my process, and following some technical issues on my end I proposed reschedule the interview to maintain the integrity of the interview. I was dismissed, he continued on his script, and delivered low-effort responses to my questions on clarification.
I am firmly against the idea of a third party handling the interview process. It shows a lack of commitment, interest, and inability to acknowledge the importance of culture. Very disappointing interview process.