It’s commonly said that you can’t get rich working for someone else. That the only way to achieve financial independence is to own your own business. This idea feels true when you are stuck in a thankless job, working long hours for mediocre pay. But it’s nonsense. It’s perfectly possible to become wealthy as an employee. You’ve just got to (a) be working for the right kind of company, (b) chart a course for yourself that takes you from ordinary to valuable and from valuable to invaluable,…