InfinityLabs R&D interview questions

After registration, they send you a website link where you learn the introduction to C language. The interview process takes almost the entire day. The first step is an introduction and a Q&A session about the company. Then there's a test using their own programming language, which includes only very basic functionality, similar to C-like languages. After that, there's a 30-minute to 1-hour video call with HR. The problem is that the whole process is very unorganized, and most importantly, they often avoid answering questions. The HR call I had was quite unpleasant—the questions included personal information that I would prefer not to share, especially since it wasn’t relevant to the job or course.