Congrats on making it here! Now wait, keep the network you just made, and ask for feedback.
The basics
Email everyone you interviewed with within 24 hours to thank them for their time
You'd be surprised how small a % of folks I've interviewed emailed me after to say thanks
Email the recruiters to thank them for setting everything up
Add everyone you spoke with (interviewers and recruiters) on LinkedIn
Wait patiently :)
When you hear back
If you got the job, congrats!!
Take some time to chat more with the hiring manager / leaders to get a sense for if this is an opportunity that truly fits your values and learning goals
are popping up nowadays to help you negotiate comp
If you didn't get the job
It's okay, happens to everyone. Even people who've held seniors PM roles at a bunch of popular tech companies have copious rejections from all stages of their career
Ask the recruiter for feedback on what you should focus on to improve next time you do interviews
Email or LinkedIn message one or a couple interviewers from your onsite (ones you think you got along well with) to ask for feedback as well
Either way
Whether you got the offer or not, and whether you accepted it or not, you now have a larger network!
Interviewing is a great way to meet fellow professionals in your network, and you should stay in touch with them / offer to help them out periodically
The most consequential job offer I've gotten in my career came to me because I interviewed (and did't get an offer) at a different company a year beforehand and hit it off with one of the interviewers from that loop, who was working at the new company (that ultimately gave me an offer). He made sure I got an interview when I may not have otherwise