I applied through a recruiter. The process took 2 weeks. I interviewed at Flatiron Health (New York, NY) in May 2015
Interview
Two part coding exercise via codility
Phone coding exercise via coderpad
Multi hour in person tech interviews across 5 or so people.
Interviewers are very nice, as are recruiters, but questions are challenging and focus on heavy whiteboard components. They prefer individuals with strong computer science backgrounds.
Interview questions [1]
Question 1
Algorithm for finding anagrams in a set of letters that users all of the letters.
I had an online assessment first after applying, and after I passed it there was a pair programming session with one of their engineers. The online assessment was more difficult, the pair programming was more practical.
Very long and weird process, you do all the interviews together and then you get the results at the end. You might not get hired because of the feedback of any interview but you still do all of them and I find that such a waste of time.
Interview questions [1]
Question 1
Question about if there is a path between one node and all other nodes
1. Online Application
2. Take a home assignment - it was a hacker rank coding challenge having three coding challenges. It can ask for coding involving multithreading. You will get 1hour 40 mins.