OA + 1 round of interview. Basic probabilities about flipping coins. The last two questions in OA are quite open, asking you the idea of estimating something based on some given information.
There is no interview, just an online assessment to test your coding ability. I applied for the technology stream. Results are out after a couple of weeks. Also form to filled in.
I applied online. I interviewed at Jane Street in Apr 2017
Interview
It's not a traditional interview, but more they ask you to solve a puzzle using any method. I first applied online, then they contacted me again that I moved onto the next step in the application process.
Interview questions [1]
Question 1
To solve a puzzle that involved allocating resources to 10 different districts.