Where can hardware engineers find private jobs?

Generally, it is introduced by acquaintances I know at work, and people who come into contact with the solution company know more. Only by improving your own skills will others dare to find you; I haven't seen it online. I don't know if it's true or not. I don't comment.

In addition, ordinary technicians have to work overtime, so there is no extra time. They should think it over and decide according to their own conditions.