Ionic+Firebase Chat features rebuild

We are looking for skilled and passionate mobile developer, with experience in: * Ionic Angular * Firebase to "rebuild" chat features in existing mobile app. The candidate must have previous experience in building chat app in the past based on free and/or open source technology stack. The app is already developed. We need to rebuild the chat features based on Ionic4/5 and Firebase stack. The new chat features must contain the following functionalities: * Real Time Text Chat over [login to view URL] with complete history * load chat history on scroll * 1:1 Individual Chat * Group Chat * Create new group * Add / remove person * Manage group profile picture and descriptions * upload images/videos * emjois support * add people to chat from contact list (send link to app if user not downloaded the app) * send + read ticks (similar to whatsapp) * typing indicator * timestamp * integrate with existing authentication (Firebase based) * Social sharing * Push Notification using Firebase Cloud Messaging (FCM) and Firebase Cloud Functions (FCF) * Unread messages count on friends/groups list * Enable & Disable push notifications * Messages Search References: * [login to view URL] * [login to view URL] * [login to view URL] * [login to view URL] * [login to view URL] * [login to view URL] Previous experience in Firebase, Ionic Angular and Chat is a MUST. Please answer the following questions along with your proposal (bids without answering all the questions will NOT be entertained): * Do you have experience with Firebase? *Do you have experience with Ionic and Angular? * Have you built Chat apps in the past using Ionic framework? Can you share an apk, or a video recording of the app? * Which of the features mentioned in the job post you do not have experience with using Ionic framework? (e.g. typing indicator, ... etc.) * What is the technology stack are you intending to use for Push notifications, storing chat history, websocket?