The money could be a lot better. It doesn't start off well, and raises that outpace inflation are rare. They'll keep you going with the promise of a bonus at the end of the year, but when it comes, it's disappointingly small. According to the CPO, they don't pay competitively because they want unhappy employees to not feel locked in. (She was silent about the effect of this strategy on happy employees.)
For a company that so loudly declares itself family-friendly, you'd think that they'd have a generous benefits package that included the whole family, but you'd be wrong on both counts. The claim also rings hollow when you see that the only people who have any upward mobility in the company are the ones who will literally report in for work the day after the birth of their first child. And of course that puts women at a disadvantage. Every woman I worked with at AoPS, to the person, told me she felt like she wasn't taken seriously and had fewer opportunities at the company due to her gender. The leadership refused to pursue reports of a hostile workplace because those accused of causing it had too much seniority.
The surest way to find favor at AoPS is to be the CEO's sycophant. He loves being told how smart he is, and equally important, how dumb everyone else is. Quality of work, years of experience, and new ideas are irrelevant, and sometimes counterproductive. That's how you see, for example, a CPO hired straight out of school with no HR experience whatsoever.
According to them, they care more about people reflecting the company's values than anything else. But what are those values? When the company released them as an internal memo, at the top was a declaration that they were the "mightiest minds on the planet". It said nothing about the power of learning or the value the company would bring to its customers. That tells you everything you need to know - AoPS does not exist to promote education, it exists to feed the ego of the CEO and his inner circle.
In fairness, there is free coffee in the break room.