Ask how long it will take them to actually get you your stock certificate, should you accept. Doing anything stock related with a startup is can of worms - thi

Ask how long it will take them to actually get you your stock certificate, should you accept. Doing anything stock related with a startup is can of worms - things always get delayed due to board meetings, valuations, fund raising, etc. These things all leave the door open to you, one way or another, not getting your stock. I'd definitely ask them about this. The answer will give you a preview of what the process of collecting your stock will be like.