One thing you can do is ask to see the space where developers are working. Do developers there look generally happy? This is highly subjective and prone to fal

One thing you can do is ask to see the space where developers are working. Do developers there look generally happy? This is highly subjective and prone to false-positives, but in general if everybody kind of looks like they'd rather be somewhere else, take note of that. Is there another developer in the interview besides the hiring manager? Do they seem engaged and are trying to sell the job to you (a good sign), or are they kind of disinterested (a bad sign)? Are the interview questions adversarial? ("Solve this problem. Ha ha, that's not right" - bad) Or are they asking about you and your experiences and trying to relate them to what you'll be working on. (good) What specific aspects of your current workplace do you view as toxic?