How do you connect a light switch with no wires available?
You don't have enough wires between switch and lamp to use hardwired controls. 

However, you do have "always-hot" and neutral going to each relevant location. 

It's time to go with "smart devices".  You need a smart lamp fixture (or a plain lamp with a smart module), and a smart switch capable of remote-controlling said lamp or module without the use of hard wiring.  Such things either communicate wirelessly, or they induce signals onto the power wires.  

It's difficult to give a product recommendation, as these things are blossoming onto the market very rapidly, and the options are ever-changing.  (for that reason, SE's format is to focus on durable advice and not to give specific product recommendations as they are quickly outdated.)

I'm quite sure what your 'maintenance guy' did was intentionally misconfigure your wiring so the light misused the safety ground wire as a neutral/return.  That is an illegal and dangerous thing to do, and we won't recommend it here.  Not least, any wiring problem can put 120V on the light switch cover screws and electrocute you!