My company is WFH right now, but my team is distributed across 4 cities anyways. I've mentored a handful of junior developers and it seems to have worked well,

My company is WFH right now, but my team is distributed across 4 cities anyways. I've mentored a handful of junior developers and it seems to have worked well, however, you really need a culture which supports it. Active video/screen sharing time, solid onboarding documentation, RFCs which describe processes, etc.