On some of my cover letters I wrote "full stack from the transistors upwards", because at one point or another I have shipped code in:
- IC design software (at a startup bought by Cadence)
- an IC (contract out of Dallas semi)
- FPGA HFT acceleration
- fixing some OS drivers for Windows CE
- finding a compiler bug
- various bits of embedded firmware in C and assembly for various platforms
- debugging with a scope
- desktop applications
- a web server (defunct ZWS)
- web apps (Perl. Long time ago)
Somehow I've never written a react app.