I don’t know about now but back when i worked in STEM, almost everyone in tech used some atlassian software
the company has an IPO so the net worth is largely equity value, i’m sure the net worth would have increased substantially during COVID/wfh periods.
from his wikipedia page “Farquhar often carries the epithet of accidental billionaire after he and his business partner Mike Cannon-Brookes founded Atlassian with the aim to replicate the A$48,500 graduate starting salary typical at corporations without having to work for someone else”