Squeeling coming from front end...

This will probably get me in trouble with some of the professional mechanics on here but here goes;
they had to remove the wheel bearings to get at the brakes. they should have inspected, cleaned and repacked (grease replacement) them. a good mechanic would be able to tell if they were bad between the cleaning and repacking stages and should have said something if they were questionable. That only leaves improper installation after the brake job as the cause for them going bad so soon after your brake job.