Great process with a mix of in person interview and demo/presentation. There were multiple in-person interviews with a mix of VPs and engineers in the interview process. The good part is that they bring you in for face to face interview, right in the beginning of the process.
I applied through a recruiter. The process took 2 weeks. I interviewed at MuleSoft (London, England) in Sep 2014
Interview
Called by recruitment team who are not pushy and suggested an exploratory chat.
6 interviews - phone, f2f and via Skype
No technical test but a strong technical interview.
Hiring process is quick. Once interviews are complete they don't hang around and offer was presented shortly after my final interview. Recruiters keep you informed all thought out the process and genuinely care about the people they want at mule.