I'm curious if Australia and Ireland (two of the most prominent users of ranked-choice voting) use machines to automate the electoral process.
In Australia, the senate elections have been counted electronically for quite some time, with the software having existed in some form since at least 2003 (see the submission linked in the annotation) and said precursor was used for the 2004 election.  It is also used for commercial vote counting services provided by the AEC.  A video series "Down for the Count", was published roughly around that time period for educational purposes, and mentions the "help" of computers—I would interpret that as electronic counting of votes input via manual data entry, but that is of mostly historical interest. More current vote counting procedures were briefly touched upon in this SBS News report: Ballots are scanned with Fuji Xerox machines. This is the case with at least some of the state upper houses as well. I'm fairly sure lower house votes are still counted by hand in all elections though.
As for Ireland, I believe they trialled electronic voting machines in 2002, but plans to expand that in 2004 were scrapped due to auditability concerns. I am not aware of any use of electronic voting or vote counting machines other than that pilot program.