Ask HN: How to get hire by YCombinator startups?

I want to work for ycombinator startups, i am a full stack developer with good theoretical concepts also had a year at a startup that got selected for blackbox connect. I have tried couple of time applying at YC startups but never got response. Can anyone suggest me what the preferences of YC startups for their hirings ( candidate must have open source contributions, have +5 year experience .. etc ) I would really love work at such a GREAT environment like YC Thanks