The project is indeed interesting. Do you really want to launch an app, or it's just a university project? I'm asking because I need to do something similar, but without making it real. Actually, the project I'm working on is about language learning, and it has two parts - theoretical and practical. With all that literature research, analyzing, and writing, I got help from https://edubirdie.com/cheap-research-papers because I have limited time, but now I'm working on practicals. I also created a questionnaire and will soon send it to students at my university. It has both open and closed questions, and I expect to get very detailed, which will tell me if it's possible to create a good language-learning app with such concurrency.