At what level does Meta issue an L1-A visa for engineers looking to relocate to US from other engineering sites?

Are you currently at Meta? If so, I would talk to your manager.

If you aren't currently at Meta and this is a dealbreaker for you to join, I would talk to the recruiter.

Some people who may know more about visa stuff:

• https://www.linkedin.com/in/harsh-fyi/
• https://www.linkedin.com/in/agrawalarchie/