Cross-Platform Utility Mobile App Development

I'm looking for an experienced mobile app developer to create a utility app for both iOS and Android platforms.

Ideal Skills and Experience:
- Proficient in cross-platform mobile app development, particularly using frameworks like Flutter or React Native.
- Strong background in developing apps.
- Familiarity with iOS and Android design guidelines and best practices.
- Ability to deliver high-quality, bug-free apps within agreed timelines.

Content in App:
-Basic UI with purchased template that fits the brand
-Email/Password sign up
-User invitation Emails
-Multi-tenant Accounts
-Dashboard
-Activity Feed
-File Uploading
-User Profile
-Transactional Emails
-Ratings or reviews
-Calendar
-Messaging
-Controlled social sharing
-Payment Processing
-User Admin page
-Send texts
-SSL Certificate based security
-DoS protection