[zenbowman]

Work hard for your boss, but learn to, and intentionally practice communicating your work to a wider audience, so you are not tied to the fate of your boss or company. Speak at meetups, conferences, take an active role in mentoring, and develop meaningful relationships with peers in other companies so that when you want to move, its easy to do so.

[Ixiaus]

Contributing or producing your own oss software too. Writing your thoughts and experiences in a blog our book too.