Is It Possible to Hold Two Full-Time Jobs Simultaneously in the U.S.?

I have a question about employment rules and practical considerations in the U.S.
Can a U.S. citizen software developer who is currently working full-time (onsite) for a U.S.-based IT company apply for and accept another remote position with a different U.S. company at the same time?

I am interested in understanding:

• Is it legally allowed to work for two employers simultaneously as a developer?
• Are there any restrictions or laws that prevent this?
• Do companies usually allow employees to have a second remote job?

I’m seeking advice, particularly from those in the software or IT industry, who have experience juggling two jobs simultaneously or are considering doing so.
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