Pros
Pays okay if you're coming from publishing. The New York office had good natural light and free bad coffee. Colleagues are generally smart, kind and hard-working.
Cons
I wouldn't wish this company on my worst enemies. Callisto will go through large hiring sweeps, expect you to work like a robot (pandemic be dammed), then realize their data strategy is faulty and then lay off people without warning. They openly operate pursuing the minimally viable product, as in the cheapest, fastest, minimal quality books possible to pass. Edits and designers are disposable cogs in the wheel, while micro-managed to death by nervous, insecure managers. Promotions are very rare. Also you have to drink the Kool-Aid to get by, say only yes, work relentlessly and it's probably best to not have a soul to work here. It doesn't matter how talented or experienced your peers are, or if their designs are dated and bad. This is a publishing machine with few standards other than analysis of the competition. Design is purely a service. Your experience does not matter and your insights and thoughts are not wanted. Keep your mouth shut in this hyper-corporate, toxic tech culture environment.