One phone call with HR covering background. I was then invited for a technical interview online. I didn't pass the second stage so I don't know the next steps. For the technical interview I was talking with two quants.
Positive experience
Average interview
Application
I applied online. I interviewed at Citi (London, England)
Interview
Good overall experience. HR got in touch a few months after application. Interview was basic quant maths including probabilities, linear algebra and calculus. Interviewer was helpful when stuck with hints.
Hiring manager did not show up for interview despite recruiter 3 times in a row scheduled. Despite high reputation of citi bank, i never expected this kind of issue can happen, my candidacy are still in progress.