Groupon Software Development Engineer Test interview questions

It was a 2 week process for me. Stage 1 - Recruiter phone call - 30-45 mins. It was very engaging and positive. Stage 2 - First technical round - Its on the difficult side technically. The questions were very practical starting from the DNS - Load Balancer - Stacks to the http pages and the internal functioning and redirections if any. Also, there were some serious coding questions. Stage 3 - 4 Xoom Interviews . 2 were technical, 1 was manual and 1 was behavioral. The 2 technical interviews were quite tough in my opinion, but the interviewers were kind enough to throw hints and explanations as and when needed. The questions were highly focused on the data structure part and even the coding questions were more emphasized towards efficiency. In total I got 5 coding problems. I was able to solve 4 of them. But they are really looking for more efficient programs and were looking for the best solution. Even the questions were towards the depth of knowledge of Java, not the basic ones. I feel it was a bit over done requirement for a QA role, (I have created multiple frameworks in my career, and I felt that they were looking for a developer rather than a QA). But undoubtedly, it was a great learning experience throughout. and the interviewers were awesome in their respective skillsets.