Deloitte Software Engineer I interview questions

The interviewer asked about my previous software engineering experience. Furthermore, he asked about challenges taken and how I managed them. All in all the interview was quite easy with no real coding challenge.

3 rounds of interviews. Phone screen with the recruiter, technical with an engineer and a 3rd with a senior engineer. The 3rd interview with the Senior Engineer was very bizarre and left me perplexed after the feedback I received. The role was for a mid level react position. The Senior Engineer began by asking questions about data types. The interviewer dinged me for not mentioned NaN as a data type, (its not, its a value of the number type, but I did not correct her). She then asked very poorly worded "truthy/falsy" questions that were hard to follow. We then got into the React portion which is one of my strengths. She asked questions about React hooks, I named useState() and useEffect(), I proceeded to mention useMemo() but she stopped me and said that she didnt know what that was and went to the next question. When talking about hooks I mentioned how class based components were still commonly used and she asked for an example and I brought up and ErrorBoundary and she did not know what that was. When I got my chance to ask her questions I asked about her career path and in her opinion at what point did she become a senior engineer. She mentioned when she could help juniors install npm packages. Despite her knowledge gaps, I thought the interview went quite well and if anything I was overqualified. I got the rejection from my recruiter a few days later and the feedback was that my React knowledge was spotty and I am more suited for a junior role.