Pros
Very flat hierarchy
Small engineering org size
Very open culture
No legacy tech stack
Lot of learning and growth for entry and mid level engineers
Cons
For an IC, Senior Engineer role is more or less saturated. If you are interested in manager role, senior engineer can be an EM. There is also Architect role beyond senior engineer. It has limited capacity and someone who is an architect should leave the company for one of the senior engineers to become an architect.