I applied in-person. The process took 3 months. I interviewed at OANDA (Gurgaon, Haryana) in Jun 2019
Interview
Discussion on resume, trading domain, existing projects and 3-4 hands on coding question using code pairing sessions.
Overall very pathetic interview process. They can revoke your offer at any point of time near joining date. I would suggest to stay away from this organisation.
Interview questions [1]
Question 1
Implement hash , thread safe implementation of a queue, fix protocol internals etc