FrontendTable-stakes
AJAX / Fetch API
Also written as AJAX, Fetch API, Axios, XMLHttpRequest, XHR
The ways a web page talks to a server in the background without reloading. AJAX is the old name for the technique; Fetch is the modern built-in tool and Axios is a popular library for it.
Think of it like
Sending a runner to fetch one item from the stockroom instead of closing and reopening the whole shop.
Junior or senior?
Table-stakes for any web developer.
Senior sounds like
Talks about error handling, timeouts, cancelling requests, and loading states — not just making the call.
Ask them
“What happens in your app when an API call is slow or fails?”