Like all companies, you need to make sure, and having in writing, the bits of your job you worry about.

For example when I joined a startup, I got in writing that my hours would not exceed 40 a week. If a company doesn't want to do that, then I don't join.

Now we are lucky that presently a sysamdmin/SRE/devop can be picky.

There are so many startups out there, some are run by people who genuinely care about their staff, and some are run by callous shits. As with any job interview you really have expend effort reading your interviewers.

Are they worried about speaking plainly?

Do they raise eyebrows when you say that you have a family you want to see?

Do they get defensive when you ask them about engineering choices (platform/language/pattern)

Do they use issue tracking?

Etc, etc, etc. as with all interviews, you need to make sure that you are happy with the answers, and have no nagging doubts before joining (unless you are desperate for a job of course. )