I applied online. The process took 3 weeks. I interviewed at SmartRecruiters (San Francisco, CA) in July 2018
Interview
The process took around 2-3 weeks. First a phone screening with the manager to talk more about the role and why you are interested in being an SDR. Then invited to on-site to meet with other managers and current SDR. The on-site took around 1.5 hours meeting with different people to talk more about yourself, what you know about the company and why SDR. There was a short mock role playing during the interview.