[hnthrowaway0328]

I'm still not a senior, thanks to my horizontal/vertical moving across the organizations.

I'd just tell my young self to concentrate on the fundamentals and go as deep as possible. Be someone who does NOT need to suck up and "network" and can still find a job even in a recession. Be PURE technical; Don't be afraid to not get a hold on business; Abstract yourself away from business because that's something you are bad at. Maximize what you are good at instead of trying to be an all-round bucket.

Oh and not to get a kid when you are busy advancing your career. Maybe just not get married at all.