You have to be experienced with UI frameworks in general; we love the Angular and Angular material.
You have to be experienced in building Single Page Applications (SPA) & integrating Web (Rest) API.
Well versed with Angular modules or you have created custom and web components by yourself.
You must have practical experience on Node.js, TypeScript, webpack and Third party library.
You have an in-depth understanding of cross browser compatibility and you do not create bugs for such reasons.
You are pixel-perfect in design conversions and you think of mobile-first implementations.
You should have knowledge of CSS preprocessors, Media queries, Image compression and be good with debugging.