Well, I can't tell a lot about this project. It was kind of "proxy" system, which receives some data, handles it and passes to the destination. I was talking to the managers about my wish to try myself as a backend developer, that's why I was assigned to that project. It was written in Flask with MySQL. Though I wasn't working there for a long time, it was extremely helpful project for me. I finally saw real, production-ready backend project. It was especially interesting to develop new features also bear in mind speed, security and stability.