I had a boss that screamed at the engineers on a daily basis and demanded that we work 14 hour days, 7 days per week.

Needless to say, I "burned out" after maybe 3 weeks. Within 2 months, 8 of the 10 engineers left the company (including myself).

What's shitty about the term "burnout" is that it often blames employees for reacting to normal stressors like human beings. Based on your post, it sounds like you're giving your company your best efforts and they're squandering your energy.

I think you should start actively applying to other jobs before you lose the motivation to leave.