To maximize the chances of offers coming in around the same time, I generally suggest that candidates stagger applications as a first tactic. Generally speaking, we expect smaller companies or firms with lower levels of bureaucracy (not always the case) to move quicker, so one should apply to those last since they can usually be more agile.
Once in the interview process, you can try to expedite some interview processes while slowing down others. So you might ask one company to push an interview up and another to push an interview back. Once an offer is about to be presented, asking questions can help delay a bit as well - you could ask all your questions at once in an email if you want a speedy reply, and you could ask questions in a live meeting or call (that requires scheduling) if you want to buy yourself a few days.
Once in the interview process, you can try to expedite some interview processes while slowing down others. So you might ask one company to push an interview up and another to push an interview back. Once an offer is about to be presented, asking questions can help delay a bit as well - you could ask all your questions at once in an email if you want a speedy reply, and you could ask questions in a live meeting or call (that requires scheduling) if you want to buy yourself a few days.