I'm an early engineer at a startup that that is likely to IPO within the next 18 months.A majority of my equity has vested (~85%) and at this point and stage of the company I'm not having the impact that I've come to enjoy.   R&D has stagnated as we turn the corner e.g. focusing on efforts that impact margins rather than new product development or transformative work.  Ideally, I'd like to leave and join an earlier stage company.For those who have gone through IPO - what would your advise be here?   A couple specific questions I have -1) The company has extended my post employment expiration window to 1 year, what would happen if my shares expired during the lock-up period?   Woudl I lose the ability to exercise them?2) I have been offered 3x over the option price on the secondary market.  Should I sell some of my vested equity to cover more options and exit or just sit and wait until after the IPO?Bascially I'm getting restless, I'm satified with the job but I don't want to lose the potential gain from the equity I have.