I saw the phrase "full stack engineer" cross my path recently. The first time I saw this, I wrote something on Google-internal Buzz. Read on.
"Much has faded now, but there was a time when I had at least a rudimentary working knowledge in gravitational physics, particle physics, nuclear physics, solid state physics, quantum electronics, electronics, quantum optics, LSI design, circuit design, chip layout, circuit board layout, system architecture, plus: machine code, assembler for various architectures, a wide variety of programming languages, device drivers, operating systems, 2-d graphics, ..." ...