I applied online and got a call from recruiter in 2 days. He was a very pleasant guy to talk to but never had the sense to book a time via email to talk before calling. And this happened on multiple occasions where once I was in a product demo meeting. He scheduled a 45 minute technical screening interview with a manager and architect where they talked for 15 minutes about what they do and what their mission is which was very good. The next 30 minutes was a very programming question for which I had a solution ready in 5 minutes with O(n) time complexity. The manager didn't asked me to optimize it and also gave me a hint about what solution he was expecting/had in mind. When I said his solution also solves the question in O(n), he probably didn't like it. Never heard back from the recruiter even after investing 2 hours of my time. Bottom line, if the solution isn't what they expect it's not correct.