On the personal side, I use Debian desktop, which is a lightweight way for me to get work done and do software development. On the professional side, we have Debian servers that host web applications and execute droplets on servers that containerize applications.
We use Debian in our professional environment to host an N8N droplet for automations, specifically work automations. We have a container on a Debian server for a couple of our web applications. We have a web application that helps us manage our support inquiries and a web application that helps our clients engage with their patients. Some of those are Debian, and some of those are Ubuntu.
I have also used Debian via WSL, Windows Subsystem for Linux, which is another personal use case for software engineering via VS Code.
We use Debian deployments primarily on cloud providers such as AWS and Google Cloud. I mostly use AWS for our Debian deployments, but we also use DigitalOcean.