You may be tempted to disregard the negative reviews, but the concerns are real. Many (not all) of the positive reviews appear to be astroturfing.
The company may be mission-driven, BUT it also means you'll be seriously underpaid compared to market, expected to work long hours, and commute 4+ days per week. You'll hear "public service is personal" yet they've treated many employees very impersonally, and the turnover rate reflects that. For those that haven't left, MANY of them are feeling burnout and exhaustion.
Pay is low compared to the market. Benefits are also not impressive in comparison (401k match is low, health insurance costs went up significantly, forced return-to-office, etc). They are actively reducing work-life balance and expecting you to work your 9-5 and be available all hours outside of that.
Every task is treated as an emergency, so you're often expected to drop what you're doing, even on vacation. Promotions are barely promotions, as the pay increase is little more than your typical yearly inflation adjustment. Career development is basically nonexistent - they used to offer LinkedIn Learning and other continued education, but have since cut those programs.
The culture is a problem, and it starts with execs/leadership -- lots of micromanaging, leadership going back on what they previously said, constant pressure, etc. It's clear they don't trust employees. The "culture of shout outs" they do on team calls often rings hollow as a result. Maybe 3 years ago, but not anymore.
I used to have so many more positive things to say about this place, but it's no longer the company I remember.