just one round of interview, ask some general tax questions, how to work with clients and how your experiences applicable to the role, why we need to hire you, what is your hours of availability

The interview process was smooth and typical. It doesn't take much to get hired so the sharper you are the easier it will be. Make sure you dress sharp, present yourself well and seem like you have ambition and drive to close business. This is just my personal advice, but when they ask do you have any questions, make sure you ask something about the company. It shows you have more interest in them.