Need someone to do tile work in bathroom for leak through ceiling

[Steve S.]

Basically the Plumber said the tile in the corners wasn’t installed correctly and is starting to drip out of the “pan” for the shower into the ceiling down below. 

Also need to Kilz and repaint the ceiling. 

Any suggestions on where to look for someone to do this work?  Plumber I use said he didn’t know someone but it’s not work he or his company do. 

What expertise should I inquire about to ensure I get a qualified person to do the job right?

What should it cost?