This looks like a more hardware focused job listing, so if you have a typical CS background you probably lack some of the expected skills for it. Note the mentions of RTOS, embedded, hardware schematics/bring up, and ARM core knowledge.

What happened to PPB? I haven’t seen it in a while despite a ton of PPB worthy posts

Java/C# would have types before the variables:

double sum = 0d;
for (int i = 0; i < 4; i++)
	sum += 3 * i;