Usually companies which hire generalists would interview with Algos, DS, System Design and then have tech specific interviews later on. Some may not even do tech specific and others may do it in matching stage after making the offer.
Really there is a lot of variance, but if you are looking at FANG, better bite the bullet, give yourself decent time (3 - 6) months to prep and start applying/interviewing.
For other non FANG, I assume the process may not be so leetcode focused, no guarantees there as there are many companies which prefer to ape FANG style interviewing at their own peril!
Good luck.