I'm not at Pinterest specifically but I recruit in the same tier and a former colleague moved there last year. I've compared notes. Here's what's actually happening in that recruiter screen.
The recruiter screen at Pinterest is 30 minutes. Standard stuff but a few things to know:
They actually read your resume. Not all do. Pinterest recruiters often have a specific question ready about something on yours. If you have a gap, have something brief and non-defensive ready.
Questions I've heard come up consistently: Why Pinterest (they seem to care more about this than average, probably because the brand isn't as "obvious" a destination as FAANG) What's a project you're most proud of. Keep it concise; they want to see you can summarize What are you looking for in your next role Availability and visa status if applicable
Comp alignment: they do ask ballpark TC expectations on the first call. Know your number. Don't be cagey. They will not extend an OA to someone dramatically outside their band.
Timeline they usually give: OA within a week of the recruiter screen if they're moving forward. Recruiter was apparently pretty responsive in a lot of the threads I've seen.
The recruiter screen is honestly more of a filter than a test. Be coherent, know why you want the role, know your number. That's most of it.