LinkedIn and Indeed mostly, though I do check my resume against the listing using stuff like jobscan.co to play the stupid match-the-keywords game to rank myself as high as possible. The response rate sucks but I do get responses, and I think shitty response rates for applications via job boards is kinda common in general. In my area (both geographically and career-wise I suppose) there are also plenty of recruiters looking for people to get in the door, which gets you past the AI gatekeeper. Though recruiter activity has slowed down in the past year and it's not a time of plenty anymore they're still around.

As with anything YMMV. So many variables, and surely some luck has played a part in my experience.