I applied through the website.

I then got a phone screen from a recruiter. She gave me the take-home assignment and asked me to implement it in 2-4 hours. I took about 4 hours to implement it, following that guideline very carefully, and submitted it.

After 3 days, I received a 3-sentence rejection email from the recruiter without any mention of a reason. I insisted and asked her to provide feedback.

Later, she called me and gave me some feedback from their two senior engineers. Some feedback I accepted, but some I could not accept, like the lack of test cases, not providing alternative solutions, and results not being put into a structure.

The recruiter told me that about 1/5 people pass the take-home assessment.

If you apply for this company, I would not recommend doing the take-home assignment. It will most likely just be a waste of your time!

A similar MapReduce problem and its implementation.