PWA Development for a Unique Social Network

I'm looking for a skilled developer to create a Progressive Web App (PWA) for a unique social network with an Instagram-style functionality and interface. This project will also incorporate a simple Wikipedia-style content categorization system and a subscription model.

Key Features:
- **Social Networking Elements**: The app should include user profiles, posts, direct messaging, and a like and comment system. Experience in creating similar features in previous projects will be highly regarded.
- **Content Categorization**: The app will need to incorporate a Wikipedia-style content organization, using both tags and a category hierarchy. A strong understanding of content management systems and experience in implementing similar features will be beneficial.
- **Subscription Model**: The app will require a monthly subscription option. Experience with integrating payment gateways and creating secure, user-friendly subscription models will be essential.

Ideal Skills:
- Proficiency in JavaScript
- Experience with API and Firebase
- Strong knowledge in PWA development
- Previous experience in social network and content management app development.

Please provide examples of previous projects that are similar to this one in your proposal.