Tech survey results, ops load via CTI tickets, CR/LOC stats, accolades, COEs, promotion rate, turnover/attrition....

There are so many data sources that are all queryable via API. There are a couple basic greasemonkey scripts already floating around but as an SDE it really isn't that hard to write something yourself... It does take a bit of experience to get a good heuristic on weighting the different data points but you can do way better than blindly guessing.

I will say as someone who HAS intelligently looked through this data for most teams at Amazon, there is an absolutely MASSIVE difference between the top 10% of teams and the median, and an even larger difference between than and the bottom 10%, which by all metrics appear to truly be hell on earth.