Pros
I would highly recommend the company to anyone, who wants to become more familiar with AWS or to tackle a wide range of quite different engineering problems. The company's founders have my enormous respect. Not just for the amount of effort they put into the company, but also for their skills and personalities. Also the team at LocalStack is one of the best in my experience. Everyone is knowledgeable, passionate and a pleasure to work with. An important question then - why am I leaving such a place? It is only because my interests are moving away from technologies to people. And on that side LocalStack at the moment doesn't need me - the founders are able to cover successfully both guidance to the team and the work with the customers. If that ever changes, I would be happy to work with LocalStack again.
Cons
Can't think of anything worth mentioning.