Continuing the discussion from What was your first job?:
I definitely agree with Hunter Walk here, who recommends joining a growth-stage startup. See article below.
The exception is if you really have something that's working and calling to you- maybe that's worth doing. But for those who are trying to decide from scratch, I think joining something like Slack, Surveymonkey, Optimizely, Twilio, or on the consumer side, Uber, Snapchat, etc. is the better way to go.