The talent recruiter first called me after talking with her followed by one week a senior developer called me for 30 minutes long technical interview. Then I was assigned to do develop an app which has backend dependency . Even though I am not full stack developer I have Developed the app with mock api server as they have suggested. However, I have used clean code architecture MVVM and databinding for the app. They had silly feedback about my code. Which is was 100% functional. They have mentioned I was lacking test case which was untrue as well. Anyway the whole process was a such a waste of time.