Mobile App Developer Needed for Halloween Events, Costume Sharing & Voting App (iOS & Android)

We’re looking for an experienced mobile app developer to build a Halloween community app for iOS and Android. Users should be able to share their costumes, vote in costume contests, and create or join Halloween events. Core Features User accounts: Sign up, log in, and manage a profile. Costume sharing: Upload costume photos with captions and browse other users’ posts. Costume voting: Vote for favourite costumes and view contest leaderboards, with controls to prevent duplicate voting. Event creation: Create Halloween events with a title, description, date, time, location, and cover image. Event discovery and RSVP: Browse upcoming events, view details, and confirm attendance. Social sharing: Share costume posts and event links through social media and messaging apps. Push notifications: Receive event reminders, voting updates, and relevant activity alerts. Admin panel: Manage users, events, costume submissions, contests, and reported content. Scope and Deliverables Develop a responsive, user-friendly mobile app for iOS and Android. Build the backend, database, and admin panel. Implement secure authentication and image storage. Test the app and fix bugs before launch. Assist with Apple App Store and Google Play submission. Provide source code, setup documentation, and a project handover. Preferred Experience Experience with Flutter or React Native, backend development, photo-sharing apps, event platforms, voting systems, and app store publishing. Please Include in Your Proposal Examples of relevant apps you have developed. Your recommended technology stack. Your estimated fixed price and milestone breakdown. Your estimated timeline for an MVP and full launch. What your quote includes for design, hosting, third-party services, and post-launch support.