Friendship Matchmaking Service Development

I'm looking to develop a friendship matchmaking service for a new enterprise. The service should be accessible on both a mobile app and a website. I have created a majority of the website but still need help creating the backend and some design elements.

Key Requirements:
- Develop a user-friendly mobile app and website
- Implement algorithms for effective friendship matching
- Create profiles with interests, hobbies, and preferences
- Incorporate messaging features for users to connect
- Ensure a secure and safe environment for users

Ideal Skills and Experience:
- Experience in app and website development
- Background in matchmaking algorithms or similar systems
- Strong UI/UX design skills
- Knowledge of security measures for online platforms
- Excellent project management skills

I’m looking for a comprehensive proposal that includes timelines and cost estimates.