[throw_away_45]

How senior is your role ? It's not uncommon when you part of leadership (however that maybe defined) to be consulted on decisions that will impact them down the line, almost immediately.

Big companies will NEVER do this -> too much risk for them from a HR / bad reputation standpoint.

I've had a startup have me do this, it was sold well to me as "hey, join in and make decisions for your Product that you'll be running" It turned into a burn out situation for me trying to manage current job and hop in on future company calls. And I just refused after a certain point.

However, it's not uncommon. Not a red flag is probably where I would leave it. Keep an eye out though on how they manage you and your time after you join them.