Pros
1) Grammarly is a rare company in Ukraine where culture and values exist. Not only as a formality but in fact. Everyone who joins the company shares EAGER values and understands its importance. You may expect trust, respect, and support from your colleagues, whatever happens. 2) You'll work with professionals who never stop learning and who are committed to the result. You'll be challenged. You'll gain much of the experience, for sure. 3) People at Grammarly are used not only to work together but also to have fun together. There are frequent teambuildings, master-classes, talent shows, etc.
Cons
Not cons, but peculiarities: 1) Grammarly's a company with quite a flat structure. It's very likely that you will grow horizontally rather than vertically. There are different tracks for growth: as an individual contributor or a manager. 2) There's a tight correlation between impact and growth (professional level & salary), and you'll have to constantly exceed expectations to grow.