[hack_edu]

In my experience, a familiarity with the command line along with the associated general systems/server exposure will elevate your career faster than anything. For those with such exposure already I'd recommend diving deeper and become an expert in the tools your existing team uses for systems, release, and deployment. These skills also open up new career paths you may opt for in the future.

While most of us are probably comfortable enough running make/grunt/gulp/etc, that comfort typically stops there. Knowing how to set up and manage your own systems will both make you more useful on your team and visible in the org. This is especially true for junior front-end folks.