Ditto. But moving further and further from frontend these days... can't remember the last HTML I wrote. More time on HA clustering, continuous integration, build systems, multi-provider cloud management infrastructure, emerging kernel features, network-device-agnostic network connectivity rulesets... blah.

I spent a few years detached from the backend before reestablishing myself as full stack.

Also, the more I think about it, the more I think that CI, build systems, and infrastructure are necessary and important facets of being a full stack programmer.

Emerging kernel features? Probably not so much :)

Depends on the complexity/size/requirements of your CI system/infrastructure. I am mostly interested in the kernel features for LXC/virt: see https://github.com/globalcitizen/lxc-gentoo .. damn handy for rapid and efficient virtualization of complex infrastructures on limited hardware.