I am building https://github.com/claceio/clace. It is focussed on building operational web apps, with a focus on security. The end goal is to build something between https://www.rundeck.com/ and https://retool.com/, allow automation of operational tasks through a web interface while also allowing fully custom web apps.

Clace also works great for running simple web apps locally. Building and deploying a web app should be as easy and common for backend engineers as creating a CLI app is.

You should take a look at Superblocks. I think you'll find our building blocks both flexible and extensible to solve you use cases.

By app if you mean database frontend this may be interesting: https://visualdb.com

It depends on your use case or development preference. Check us out at Dropbase (https://dropbase.io)