Fantastic. This is something I've thought about doing too. There are days where visual studio's shenanigans make me consider the benefits of a bespoke web based

Fantastic. This is something I've thought about doing too. There are days where visual studio's shenanigans make me consider the benefits of a bespoke web based UI very strongly. With libraries like ace and codemirror available, the hard part is mostly on the server with managing state and integrating tools. I use C#/.NET for everything, so I'd lean on the Roslyn APIs to handle code completion, reference tracking, workspaces, debugging, etc.