Cross-Platform Productivity App Development

I'm looking for an experienced mobile app developer to create a productivity app for both iOS and Android platforms fast today you start working i need results in a week if you think you are capable then only apply.

Key features include:
- User profiles
- Messaging system
- News feed

Ideal skills and experience:
- Proven track record in mobile app development, especially for productivity apps
- Strong expertise in building user profiles, messaging systems, and news feeds
- Experience with both iOS and Android development
- Familiarity with cross-platform development tools

Please provide examples of previous work and a detailed project timeline.