Ask for referrals from friends, family, or colleagues. You can also check with your local chamber of commerce to see if they have any recommendations. If you're not comfortable with that, there are many online reviews for mortgage brokers.
If you decide to go with an online company, make sure they have been in business for at least five years and have a good reputation.
Make sure that the broker is licensed by the state where they operate and has passed all required tests.
Do not hire someone who has been convicted of fraud or any other criminal activity in the past.