What kind of flies are these and how do I get rid of them?

There are thousands of them, I compost in my balcony and they're driving me crazy. They're not fruit flies, any idea how to get rid of them?

I try to always end on a pile of browns but the bulk of the flies is not inside the bin, but behind / around it, so I'm not sure if compost management is the problem. I tried bug spray but there's always some left to restart their colony.