Finding a healthy work culture

This is an Ask a Geek Feminist question for our readers.

When interviewing for a job (as the applicant), how do you select for a healthy culture? What unpleasant traits (e.g. narcissism, sexism) do you avoid, and how do you identify them?

We’ve all had terrible jobs and co-workers. Do you have any practical advice for avoiding the poisonous job (and poisonous co-workers) at the interview stage?

Let’s emphasize problems geek women are more likely to encounter: difficulty getting credit for your work, geek-unfriendly management culture, colliding with narcissists/psychopaths/”assholes”, glass ceiling for geeks, women, and/or geek women, sexism in general, etc. If you’re telling your story, don’t forget to include what you think the first warning sign was!