Yes, as others have said, the auction houses from “betreibungsamt” definitely exist, each canton will have on their own website, for example https://www.bka.bs.ch/versteigerung-verkauf/liegenschaften.html
I had lots of free time a few years ago & went to the object viewing (usually a week or 2 before the auction, so you would have time to sleep it over, organise some cash, maybe get a bank confirmation if u need a bit of a loan), there were at least 20-30 people there.
Then the auction, maybe 4 people, someone from the bank I think, someone who stopped bidding at a very low price (probably just a bargain-hunter there in case no-one else came) and two parties who bid in earnest. After the auction, the winner handed over an envelope and I think 100’000 deposit in 1000 franc notes were counted & signed for by the court.
As with such processes try step through the process with a test run before your dream house comes along.
Also these properties are usually being repossessed due to bankruptcy which usually takes a while to happen & then come to court. The maintenance and condition can be a bit neglected the last years. The one I looked at had a messy living there. Needless to say in that example you would probably be getting a house crammed to the brim with junk when (and if) you finally manage to eject the ex-owner and now your renter (can take a year or longer if they fight the eviction, possibly paying no rent in the meantime). Of course can be totally easy-peasy too!