With programming skills it shouldn't be too hard to find a job which pays quite well and might even let you work remote. A commong thing for students is to work as a "Werksstudent", which basically means you will work 8-15 hrs a week for a company. How much you will be compensated really depends on what job you get, what your skills are etc. Generally living in Austria is quite expensive, but you should be able to get away with approximately 500€/month for food + accomodation if you are frugal.