Very interesting doc thanks for sharing!
I saw that you listed some job boards, I created https://spacecrew.com to find jobs in the space industry, and there are a lot of engineering open positions.
So I thought it would fit in the list.
One and a half years ago, I started Rocket Crew a Space industry job board
All other job sites in this industry were old and quite hard to use and most of the time there were not a lot of New space companies.
So since I love Space I decided to build an alternative. To get started, I built a web scraper for more than 50 different space companies, including NASA, Space X, JPL etc. And the traffic grew month after month
Now it has become one of the popular job boards in this niche and starts to rank first on google for keywords like "space jobs"!
https://rocketcrew.space/