A senior frontend is not the person who is fastest at Figma-to-div. That is a craft, and it matters — but it is not the job. The job is the path the user takes when the API is slow, the token expired, and the hotel manager is on a phone in a corridor.
On Visiting Media I owned product UI in React and Next.js: Storybook so the system could be discussed without a staging login, tests so a visual change did not silently break a booking-shaped flow, and the boring AWS / Docker path so preview was not a myth.
What I treat as mine: empty / loading / error / permission states, the cache that stops the spinner from lying, accessibility on the controls people actually use, and the conversation with backend about the contract — not a ticket that says “integrate the endpoint.”
What I do not pretend to own alone: brand, legal, and the server that holds money. I will sit in those rooms. I will not ship a confident UI on top of an undefined write.
If you hire a senior frontend for “just the interface,” you will still get opinions about the API. That is the point. The interface is where the product becomes true or false.