Who should I set up 1 on 1s with after joining a team?

When you're new to a company (especially at a senior level in your case), you should be "trigger-happy" and talk to people even if there's a good chance it doesn't become a deeper relationship. Two reasons:

1. You're new, so people will be more willing/interested to say hi and set aside time for you. You may not get that courtesy a year from now.
2. Even if you don't end up meeting them regularly, it's still valuable to understand their perspective and what concerns they have. That can educate how you build things later.

On the topic of recurring vs one time, I'd start with one time. It'll become obvious who are the people you should be talking to more regularly, and in general I think it's a courtesy to check with people before setting up a recurring meeting with them (has things out like duration + frequency).

For my non-manager 1:1 recurring meetings, I usually had them be biweekly for a 3 month period. Finally, I'd also talk to your manager and ask them who they'd recommend you chat with.

Wanted to share a few resources that we added since the time this question was asked:

• Daniel Tomko's 4-part onboarding guide touches on setting up 1:1s
• Some common scenarios to setup 1:1s
• The masterclass about succeeding on a new team/company