Depends on what layer of Telerik [0]. Honestly of late since I'm extra rusty on frontend I just get Copilot with Claude to help generate UI widgets since that's allowed.
Before that, years ago, I just YOLOed with WebSharper and built composition helpers to make 'spartan but correct' UIs that could be prettied up with bootstrap if needed.
That said, alas, Bolero (what replaced WebSharper) is F# specific rather than also supporting C#.
I mostly bring those up because they have various libraries out there to work with different JS bits.
Before that, years ago, I just YOLOed with WebSharper and built composition helpers to make 'spartan but correct' UIs that could be prettied up with bootstrap if needed.
That said, alas, Bolero (what replaced WebSharper) is F# specific rather than also supporting C#.
I mostly bring those up because they have various libraries out there to work with different JS bits.
[0] - Cries in webforms