Hello, There. How are you? I just checked your requirements regarding the firebase. As You can check my profile and review, firebase is my main skill. I mastered in various section of the firebase. I am familiar in the firebase trigger(http callable, firestore/storage cloud function), transaction, extension, security, firebase query, hosting, real-time sensitive db and so on. I have developed dozens of the firebase project. mainly worked in backend with Node.js and Google could platform. I am very interested in your project and hope we discuss more by chat. Wish your kind response. Thanks. Andrey