If your goal is to focus on one very specific area - a small team is not for you. Expect to be working on a variety of areas, making gradual improvements.
If your goal is to work in 5 different programming languages - this is not for you. Growth Intelligence primarily work in Python (for the data-science stack). Using other languages is possible (the UI is a react application for example) but the pragmatic choice is often to stick with Python.
If your goal is to work on a large scale distributed system with dozens of microservices, this is not for you. Its not that type of company (not B2C for a start).
If your goal is to get paid a gazillion pounds, this is not for you. Its a startup, and not one that is guzzling more venture capital money than is sustainable.