system
Given the following post, respond as if you're commenting on Reddit:
human
Referring a friend to a post doc position to my PI.

Hello, I'm a 1st year PhD student and my friend has recently completed his PhD in the same field as mine and is interested about the topic my PI works on. When I met with him I was talking about a post doc position that is available in my lab and I would like to refer him to my PI but I am very naive when it comes to interpersonal stuffs related in academia and i dont know how to deal it in a professional way, like should I first let my PI know about him before my friend approaches him by email? Any ideas would be greatly appreciated. Will my PI think negatively of me if I refer my friend? 

This is my first post in the group, I hope I didnt overstep any rules, also sorry if I have a bad grammar, my first language is not English.
gpt
Rightly or wrongly, the performance of your friend is going to reflect on you. Keep this in mind when recommending anybody for any role. 

Similarly, if your friend doesn’t get the job or doesn’t like your PI, this could affect your relationship. 

If neither of things things are a concern to you, then I’d just tell your supervisor you know someone who might be appropriate for the role and that you’ll refer them to the application.