Ask HN: React Native Testing Framework to scale apps

We are a really young bootstrapped startup. Most of the members in my team are my students from under-serviced communities in India who learned to code on their own and with some guidance from me a year back. I am myself a teacher. We were looking for some guidance from anyone who has set up rigorous testing process for react native applications to scale. We had already designed an app a year back - which has given us lot of interest in the market but it doesn't scale well and performs poorly in performance metrics when several students are using the app at the same time.

Any help would be greatly appreciated. And we will have a small gift from the hills of Himalayas for you! Thanks!