Pros
Ninja has been a great and refreshing software company to work for. You actually do make an impact from Week 1. You get to work with dedicated knowledgable and kind team members who believe in quality. You get to collaborate with management to understand the vision and direction of their products. Even at a rapidly growing company, the CEO and the rest of management continues to stay involved in projects, making it easier to understand the value in what you're delivering to customers. Teams are not siloed. The company is constantly iterating and delivering to make an outstanding product. Work/life balance is great thanks to well-managed projects (that are both interesting & challenging), they value the work you deliver and you will be rewarded for your hard work.
Cons
Can't think of any cons