They asked for technical questions related to java and spring boot including complex queries related to mysql,kafka questions and the prcoess describing this .what is serialization in java and how to use this .

The whole process took two weeks and there were 4 rounds of technical discussion. Every round of interview was positive and after the hiring manager round i have asked to wait for 3 days for the updates.I have waited for it and when i called to the HR the response i heard was its on hold and you lacked on Design question. I just wanted to let you know everyone that there were no design questions. This is a purely unprofessional attitude by Rakuten. After several rounds(4) of interviews, which were all positive, simply putting candidature 'on-hold' doesn't make any sense. There should be justified and actual reasons provided to the candidate in such a case. First and foremost, there were no communications sent from the company side & after several calls, HR simply saying - 'your profile is on hold/'/'your design skill is not that good' proves the lack of transparency in the interview process. If the stated reason was real,I wanted to know what design questions were asked?and What did I lacked in my provided solution. I deserve to know the explanation and I hope this is not a tendency of Rakuten(Online platform are full of such reviews). I would recommend never ever give your valuable time with Rakuten. I have seen this happening to multiple folks out there who interviewed with Rakuten.