Cross-Platform Productivity App Development

I'm seeking an experienced Expo mobile app developer to create a productivity app for both iOS and Android platforms. The app will primarily focus on collaboration tools.

Key Requirements:
- Develop collaboration tools within the app
- Ensure seamless functionality on both iOS and Android
- Use Expo for development

Ideal Skills and Experience:
- Proficiency in Expo and React Native
- Experience in building cross-platform productivity apps
- Strong background in implementing collaboration features

Please provide examples of previous work and relevant experience.