I stumbled into it by accident as a junior software engineer. They offered me a 3-month contract-to-hire job, but instead it became a 2-year independent contractor job for the company. Most jobs that followed have been cold applying to startup contract jobs from Craigslist or obtaining them from local word-of-mouth. It's very feast or famine, and not everyone can keep the momentum of new clients going. As for myself, I am planning to leave self-employed work for the first time in over a decade, for the relative safety of a full-time job (even with the current market situation).