IANAL, but my understanding is: Double-billing hours is probably illegal, but many remote programmers likely have two "full time", salaried, jobs with no stipulation about "you must work X hours"... at the very least a legal grey area, and if you breach some contract clause, you are most likely in breach of contract, which is a civil suit, and most likely you'll just be dismissed, no severance will be offered, and they might try to take away any unexercised options grants.