Planful Java Developer interview questions

I got the call from recruiter & had one Zoom round. And I wonder that till people don't have etiquettes for video calls & not using webcam. Current situation is just forcing these people to use such mediums else mentally they don't seem ready to use these mediums. Got one question on Singleton, Hibernate, Spring, App/webservers, MySQL database indexing concept each. Then was asked to design a class to provide caching feature without using any inbuilt datastructure. All these topics were touched by asking 1 particular question, may be to cover the topics in JD at least. Don't know what was being judged exactly by this way. Seems, this way it may be doing its rebranding again.