Hey, founder of interviewing.io here. We actually did zero thinking about SEO. We had someone look at this guide at the end through an SEO lens, but then we decided that that would make the content not as good and would make the guide less readable.

(As an aside, I think in recent years, the spirit of SEO has become more about just making good stuff and less about hacking...)

Anyway, it wasn't for SEO. It's hard to edit stuff well because we're so passionate about what we wrote here, and we probably should do another pass.