The interview covered core TypeScript fundamentals like types, interfaces, and generics, and involved a live coding challenge to convert JavaScript code to TypeScript, emphasizing immutability and conditional updates. I didn't have an HR interview and wasn’t prepared for the coding part because I assumed HR would at least be a small chat; however, the session turned highly technical. In the end, I was bluntly rejected, with feedback that my ideas didn’t matter—only the final answer did—leaving me truly puzzled.