React Native Developer Needed for Secure Messaging MVP

We are looking for a React Native developer to build an MVP mobile application focused on demonstrating the cryptographic side of a secure messaging workflow. This is not a full chat product. The MVP will run locally and is intended to validate the core encryption, signing, decryption, and verification experience before adding features such as real-time messaging, accounts, backend infrastructure, or cloud storage. MVP Goal Build a simple mobile app where one demo user can send a protected message to another demo user. The recipient should be able to decrypt the message and verify that it has not been modified. The app should make the security process visible and easy to understand through the interface. Core MVP Features Compose a message from one demo user to another. Secure the message before it appears in the recipient’s inbox. Encrypt the message using a symmetric session key. Protect the session key using asymmetric encryption. Generate and verify a message signature. Verify the integrity of the decrypted message. Display a local inbox containing encrypted message packages. Allow the recipient to decrypt and verify a message. Show clear verification states: Message valid Message altered Invalid signature Include a tampering simulation that modifies an encrypted package and demonstrates detection. Add a lightweight “Demo” section showing the main cryptographic values and steps used during the process. Out of Scope for This MVP Real-time communication Backend or API development Authentication and user accounts Push notifications Database or cloud storage Production-level encryption infrastructure These features may be considered in a later phase after the cryptographic workflow and user experience are validated. Technical Requirements React Native with Expo TypeScript Local-only functionality Clean component structure and reusable UI Lightweight state management such as React Context or Zustand Basic tests for successful encryption/decryption and tampering detection Clear comments around critical cryptographic workflow logic Readable README with setup and launch instructions Design Direction The design should feel modern, minimal, and security-focused: Light neutral background Indigo or deep-blue primary accent Clean cards and generous spacing Green success states Orange or red warning states Clear use of icons for locks, keys, messages, signatures, and verification Technical details should be available but not overwhelm the main user flow Deliverables Complete React Native MVP source code Functional local message security flow Encryption, decryption, signature, and verification states Tampering demonstration flow Basic tests README with installation and usage instructions Screenshots or short walkthrough of the completed MVP Please share relevant React Native projects, especially applications involving secure workflows, complex state management, educational interfaces, or polished mobile UX.