I really want to know who designed matchmaking

I really want to know because somehow Riot puts me up with the worst teammates possible and toughest enemies too when I am about to hit Gold, same was before the ending of the season, same is now. I perform very good when I am etc. Silver II but moment I hit Silver I i get matched up with kids, trolling Yasuos, and AFK's and worst of the worst. Unfortunately this is the 2nd time I've been demoted. This caused me massive losing streaks, and simple this preseason is the worst so far. Also my enemies are 200k+ points mains, while my teammates are first timers and etc.
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