We are rolling out increasingly smooth & useful Android and iOS clients, and also have some very interesting server/data things going on. Check out http://bu.mp/jobs
I had clusters of hosts running in multiple data centers (to be certain of staying up) and they broke them all at once and did not email me. It drove me nuts. That said, maybe they will be extra careful making system-wide software changes in the future.
I did YC this last summer and it worked out great. I am 39, so close to 40. Age does not really matter- you just need to be able to work hard on something for free for a while.
Often older people with the talent to do a startup just can't bear the opportunity cost of the well-paying job they would give up.
Python, Design, iOS, Android, redis, analytics, Scala, Haskell.