Tripadvisor Software Engineer interview questions

I had a technical phone interview, followed by a coding challenge. For take home interview the question was pretty straight forward. Basic CS fundamental program on collab-edit. The phone screen also included some questions about OO and algorithms. The interviewer was very friendly and he explained the position to me in detail. The coding challenge was very interesting. I got 48 hours to work on it. I made sure that I wrote a very clean code, created README.md, wrote more than 14 test cases, Junit tests, noted my assumptions and provided them with the zip of all of these along with the source code. I did not receive any feedback on this up to 14 days. After that I got a reject. I was extremely disappointed that after so much of effort on writing a clean code, and submitting a solution professionally, I got a reject.

We started with briefly talking about the resume. I was then asked some conceptual questions of data structures and algorithms and finally a coding question. I applied during campus career fair and got contacted by Tripadvisor one week after the career fair.