In the web application development, the right choice of the programming language is the key, in particular in FinTech. Startups need something easy to handle, scalable, simple but mature and even better if there are ready-made libraries and components which could support the app. There are many things to take care of also when it comes to FinTech. From legal regulations to API connections, integrations and safety. Well, not a surprise that most of the FinTech startups are based on Python. In this article, we are going to discuss the tech stack of 6 prominent FinTech startups.