I have an interview this week with my dream company and I don't want to seem like a risky hire. How do I frame leaving my last job with a different tech company due to retaliation by my manager after a substantiated claim to HR of bullying and harassment? This was a unique situation and I have never had issues with employers nor have I gone to HR for any reason before.
"I must say that I value [former employer] a lot because of [true compliment], [true compliment] and [true compliment]. But, at least in the department I worked in, I personally perceived the climate as, for a lack of a better word, hostile. It was an interesting experience, certainly different from any company I have ever worked before. But it was also an experience I would not want to repeat. "
Then change topic - perhaps by stating that you have noticed the good climate at [the company you are applying to] and giving an example.
If they insist to learn more: Stay polite regarding your former employer, do not dwell on it too much.