I've been developing applications for the internet since such a thing was possible, usually using Ruby or Rust, though Node.js and Python are often involved.
I've worked with many fanastic clients and organizations over the years to produce everything from interactive CD-ROM material, to applications that run on smart watches, and most everything between.
Currently I'm exploring more of what Kubernetes and GraphQL are evolving towards, building out tooling around that, as well as other emerging container technologies. Where virtual machines competely up-ended the idea of application hosting, containers will likely relegate virtual machines to a niche before long.