Uber Frontend Engineer interview experience

The opening round was all about JavaScript fundamentals, with the interviewer drilling into how async really behaves under the hood. The core question revolved around the event loop and callback timing using setTimeout—specifically reasoning through the order things execute, predicting the timing of console output, and explaining how the call stack, Web APIs, and the callback queue interact.

Even though the question sounded “plain vanilla” on the surface, I couldn’t fully connect the moving parts the way they wanted. I ended up getting stuck on my explanation, and that was enough to stop me