How to answer the best project that you worked in JavaScript?

I did work a lot of projects before like this (Student and mentor project - where student asks a question and mentor answers questions, students questions are matched to mentors based on their ratings and subjects that they have in their profile The tech stack we used, we had mobile app and web app? Web app - is using react just for admin to view the questions asked by student and answered by mentors and some other extra functionalities Mobile App- I was involved in creating screens using React Native and mostly not involved in the back end part -So I hardly know how they implemented notifications in React Native to received for mentors when questions matched? And a little welcome page once they log in. -I can figure it out the front end or mobile part, but I need help on back end part Firebase - is the database they are using Back end - they are using Express.js to create APIs to do the logic like the one matching student to mentor based on ratings checking the conditions by checking the criteria Questions>
What apis might be possible to create in this case. if there are no firebase apis
- and there is a cron job written to match mentors online every 5 min in GCP (google cloud provider)- it was configured by someone else I was asked in an interview that if the questions were clicked by two mentors at the same time when they received questions, what would you do ? I couldn't think of any solution for that, I got answers like I would set a flag in database where answering is true so that we disable it for another mentor. But they asked, can we do this better? How do we answer that - I remember doing this scenario, but I remember very vividly can't create any on the spot? -If we were to create the design for this whole project again like, what stack would be better for today's world ? -If possible, can someone explain your project what's the tech stack that you are using #front-end #back-end
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