Very simple, and superficial. Seems the tech recruiter didn't read my CV, he just asked several questions that do not prove that I know or not about it. It was similar to certification questions, where usually in real life you use the documentation available online to implement things. I could perform better in other interviews where they were more checking what I can do and have experience with, instead of asking questions that might not have an answer to lower the salary requested. Later they asked me to lower my salary and chose a regular position, as I don't have enough knowledge as a senior. I don't agree with that and declined the process.