Writes the code that has to work the first time, every time.

Flight software runs the vehicle. It is written against strict standards, reviewed line by line, tested on representative hardware, and deliberately conservative, no dynamic allocation after boot, no surprises. It is also one of the most accessible routes into aerospace for someone who already writes code.
The common route. Embedded and robotics projects count for a lot.
Harder, but real: demonstrable embedded work on real hardware opens doors.
Software developers, quality assurance analysts, and testers · US Bureau of Labor Statistics, Occupational Outlook Handbook, May 2024 wages and 2024–34 projections.
Counted inside software development as a whole. Safety-critical flight software is a very small and unusually regulated corner of an occupation of nearly two million people.
Coding standards, reviews and traceability slow everything down and exist because the alternative has been tried. There is no patch after launch on most of these vehicles. The discipline required is closer to structural engineering than to web development.