Get a LLC per job and sign on its behalf, then if sh*t hits the fan - declare bankruptcy.
Not sure if you are being serious, but that is terribly bad advice.
For starters google “piercing the corporate veil”.
This is purely anecdotal, but I had to complete Conflict of Interest administration for concurrent outside employment while serving as an officer in the military full-time. Basically-- follow internal policy governing this, to cover your backside.