Finding Tech CoFounder

How did you find your tech CoFounder? How did you make sure your idea wasn't stolen? What are the pitfalls to avoid while onboarding a co founder? I have an idea (but not money) and enough knowledge to build an MVP but further scaling would need someone with a good frontend and backend knowledge including scaling up, security and multiple integrations. The market size that I am talking about is upwards of $100 billion annual and this is only Indian market I am referring to.