[snake42]

For clearance specific kinds of jobs, I use

https://www.clearancejobs.com/

[the_arun]

Don’t we first need security clearance before applying to these jobs? Or at the time of joining the company helps us to get clearance?

[simoncion]

Some employers will pay the cost to get a security clearance. Others will not. IME, employers will tell you in the job description which kind of employer they are.

"Must have a currently active $TYPE clearance." and "Must be eligible for a $TYPE clearance; position contingent on acquiring a $TYPE clearance." are the sorts of phrases to look for.

[snake42]

Depends on the company. My company prefers you to have one incoming, but since few people do, we sponsor most people.

[yazzku]

It would be good to have a "no military" filter.

Results would probably come out empty anyway.

[echoangle]

I think many Aerospace jobs that aren't directly Defense/Military (think SpaceX Falcon 9 flight control development) are also behind clearance. Of course you will indirectly help launch military satellites but I wouldn't call it a military job exactly.