Kamma and right livelihood in a modern business environment
It depends on what services you are providing to the company. If you are just helping them to balance accounts, it'll be similar to the hunter's wife cooking the meat. But if you are actually involved in poison making or marketing of the product, it won't be a right livelihood. Even as an HR officer, if you are hiring people to make poison or butcher animals, it's not a right livelihood. As a lawyer, if you are helping the company to get away with environmental damage, tax fraud, public health concerns, it's not a right livelihood. Yes, it creates bad Karma.