auto body repair technician, aka. mud slinger , mud man, dent jerker, body guy, body man.
A person that fixes cars is called a mechanic.
A person who fixes the glass portion of windows is called a glazier.
A person that fixes lights is called an electrician. They are able to fix and repair electric wiring, lights, and appliances.
What you call person who fixes light
A mechanic or an automotive technician is the person who fixes cars.
You may be thinking of the person who cuts or works with glass, known as a glazier. This job is performed by a skilled, guild-recognized craftsperson. I hope this helps.
A cobbler is a person who mends shoes.