Background: I'm a transgender data analyst/software developer. In my jurisdiction (Massachusetts), gender identity is protected under anti-discrimination laws, but most of the companies I'm applying to are startups that may not handle HR matters as well as they should. I'm not interested in going to work for a company where casual (or not-so-casual) sexism and transphobia are an accepted part of the culture, and I'm really not interested in only discovering this after I'm hired and ending up in a situation where I feel like I need to stick it out for a while to avoid looking like a job-hopper.
What I'm looking for: tools, resources, or communities I can use to vet companies for problematic culture before or during the interview phase. For instance, are there particular Twitter users who stay on top of sexism in tech/STEM (Science, Technology, Engineering, Math)? Are there inclusive tech/STEM groups (for Massachusetts specifically or the US generally) where it's possible to quietly ask about a company's reputation? Are there questions I can use to delicately probe this in an interview?
What I've already found: Joblint, which evaluates job postings for potential warning signs (take results with a grain of salt, obviously).
Potential complications: I'm not a woman and I don't want to be a jerk by inserting myself into a group that's specifically for women, like PyLadies (but if you know of such a group that might be willing to give pointers toward a more appropriate group, I'm all ears). Also, I'm new to the industry (fresh off a STEM PhD elsewhere in the US) and don't yet have a local network of developer friends to consult about what they might have heard through the grapevine (otherwise this would be my first port of call).