Applied via online, and then was interviewed via Skype. The person who interviewed me was very nice. Riot really wants you to know the game, and most importantly be passionate about the game.The interview was about 30 minutes, and the environment was very comfortable. There are multiple rounds of interviews. If you get past the phone or Skype interview, the next interview is in person at Riot. Good luck to whoever applies.

Long interview process -- multiple phone interviews before on-site. They care a ton about culture fit, and making sure you have an understanding of the field not just in general but as it pertains to Riot/League in particular. Pretty much definitely have to know the game well/play the game.