I applied online on Feb 2018, got an online test on HackerRank within a week. It was an 80min time-limiting test with two sections. One section took 50min, had two algorithms coding problems. For me, one is an easy dynamic programming problem, another one is a sorting and string process problem which is easy too. Another section took 30min. This section let me write a review report of a snippet of poorly written codes in Java. Overall I think it was a good experience. I think the problems were easy and I did nothing wrong. I wonder why I'm rejected. Maybe they are really strict on candidates and expect absolute perfect answers.