Right now, I'm doing PET SITTING, right close by, across the street, almost. Pay can be nice, but not when starting out...and if doing any 'dog walking' service it's nice to obtain liability insurance. This time the gig is going on a year, come July, (yippie).
That side job has PAID for one whole month of rent, not too shabby. (Of course it's not engineering, but I'm relatively free to study other 'Job ADs' while the neighbor's pets slumber nearby.)
Learned a lot, about being a self-conscious, upright 'employee', not causing trouble, and customer focussed, puts me above a lot of other, disrespectful service providers, (who express open contempt for the paying customer). Puppies or not, it's still a beneficial, easy side job.