Technically we have a open-list party-list proportional representation for the Nationalrat (one part of the legislative on federal level, like the congress in the US). This is the most interesting one in my opinion. Other parts of the political body do have slightly different systems I think, the Ständerat (kinda like the senate) even has a majority system.
I went down a YT rabbithole, because of your comments :D Short, kinda maths-video about different votingsystems: https://www.youtube.com/watch?v=PaxVCsnox_4 A longer math/maths-history video by veritasium: https://www.youtube.com/watch?v=qf7ws2DF-zk More about the tradition and culture in swiss politics (altho a bit romantic i must say) https://www.youtube.com/watch?v=qQ5pmW3l8tU
I miss small phones