I need a custom mobile application with an admin panel for **one-way communication**, similar to WhatsApp broadcast, but fully controlled by admin. App Requirements (Android + iOS) Flutter based mobile app (single codebase for Android & iOS) Firebase backend Login system (username & password created by admin) Strictly one-way communication (users cannot reply, chat, or message anyone) WhatsApp-style broadcast messaging: Admin sends one message Message is delivered individually to users Push notifications using Firebase Cloud Messaging (FCM) Each user should see messages in their own inbox User Segmentation (Unlimited & Flexible) Admin can create unlimited user segments / categories Segments can be based on: * subscription plan * batch * course * custom tags * Admin can: * assign one or multiple segments to a user * modify segments anytime * Admin can send broadcast messages to: * one segment * multiple segments * or all users Admin Panel (Web Dashboard) * Admin login * Create / edit / delete users * Assign or change user segments * Send broadcast messages by segment or individual user * View message history Important Conditions * Simple UI is acceptable (no fancy design needed) * Firebase project must be created using my email ID * Source code ownership must be transferred to me * App must be published on my Google Play Console (iOS App Store submission can be done after Android) * 30 days of free bug fixing after final delivery Timeline & Payment * Timeline: 20–25days * Fixed-price project * Milestone-based payments only (final payment after successful testing) Apply only if you have prior experience with **Flutter + Firebase apps and push notifications**.