I’m Silviu Marin-Caea, a Senior Systems Engineer on Linux/Unix, also with an intermediate degree of Oracle experience. I have small contributions to openSUSE in the form of bugreporting, some packaging in OBS. I’m always using the Tumbleweed version on my desktop, so that’s where the bugreporting comes from.
Other than that, there’s SUSE Enterprise Server and Oracle at work. I have a certification as SUSE Certified Linux Engineer.