I applied at the careers webpage and two weeks later, I got an email from the HR team, asking me to take an online test. The online test comprised of an online challenge, which I solved. After a week, the HR contacted me to schedule a Skype Interview with a couple of its Engineers. But the immediate next day, I got an email saying the position had been filled and they could not move on with me in the application process.

I received an online coding challenge via HackerRank. I spent a significant effort making sure it passed the edge cases. I went further, explained the code in comments and refactored it as well. No response. Not even a rejection. I sent a couple follow up emails and still nothing. Do not waste your time taking this challenge. It's not trivial and they don't even have the courtesy to respond. Spend your time studying or anything else productive.