Assuming you have experience in software, then https://www.llnl.gov/join-our-team/careers/find-your-job/0d6...

BTW, they don't seem to have software roles at NIF: https://www.llnl.gov/join-our-team/careers/find-your-job/liv...

Aren't they required to post salary ranges by some Californian law?

These are federal jobs so all of the pay bands are public knowledge.

This is not quite correct. LLNL is a Federally Funded Research & Development Center (FFRDC) which is owned, as a facility, by the government, but managed and staffed by a non-profit contracting organization called Lawrence Livermore National Security, LLC (LLNS) under a contract funded by DOE/NNSA. The board of LLNS is made up of representatives from universities (California + TAMU), other scientific non-profits (Battelle Memorial Institute), and private nuclear ventures (e.g. Bechtel.) LLNS pays, with very few exceptions, staff salaries at LLNL, and they are not beholden to the government civilian pay schedule.

https://www.llnl.gov/about/management-sponsors

Law goes into effect next year.

Is it enforceable on the Feds?

Former LLNL employee here, they hire a LOT of foreign nationals. Several people that I worked with there were Canadian.

Be that as it may, a number of positions at LLNL, including many of those affiliated with NIF, require that candidate is a US person and is eligible for a DOE security clearance. A security clearance is not necessarily binary on being a US person, but a number of national-security related positions may require not only the clearance, but also that the candidate is a US person (or outright forbid foreign nationals.)

Google "national ignition facility careers" and this is the first link

https://lasers.llnl.gov/about/careers

There's always General Fusion.