Laying this foundation is largely unachievable for people who are not full-time job seeking.
Even when you're doing nothing but applying and have a decently impressive combination of skills and experience, it can be quite difficult in certain environments to get a single offer, let alone multiple offers, let alone multiple offers coming in at the same time.
But if you're currently holding down a full-time job and are looking to make a move into a new role, the odds of everything lining up perfectly like this are going to be so low as to be unrealistic even for very talented people.