Wealthfront Software Engineer - Android interview questions

Applied online and got an unscheduled call from recruiter. The recruiter was hesitant about salary mismatch from the beginning of the call. Not a great start. I though agreed to give the interview, for my own benefit of gaining experience. Scheduled a technical phone screen a week later. Received the call from the interviewer on time and the interviewer was very communicative. They asked a medium leetcode question, which I was able to compile and run successfullt. This was followed by Android domain knowledge. I believe I answered the questions correctly. But, got a reject so I was clearly below par.