First Derivatives Java Developer interview questions

They just discussed my past project experiences, which I did. I was expecting a more rigorous technical interview wherein they will ask Java questions or design pattern questions, etc. But nothing like that. After discussing my past experiences, they asked me things like how do I keep myself up-to-date with technologies.

Not certain if it was a genuine issue or simply an HR reaction test (I have experienced those in past interviews through my career), but the onsite HR interviewer asked me to detail my knowledge of their products and the company. I answered by providing detail relating to the tools the company used to develop their products (I had visited their website and read through the whitepaper information they had) and my understanding of the company domain. The HR interviewer pressed me for specific knowledge of the FD software (i.e. what do I know about FD product X) and that it was very concerning, that I didn't possess detailed knowledge.