Dual-Platform Sublease Listing App Development

I am in need of an app developer proficient in iOS and Android platforms to create a solution for individuals to post apartments they are aiming to sublease.

Key App Functionalities:
- Search and Filter: Users should be able to streamline their search through a range of parameters ensuring matching listings.
- Save Favourite Listings: Users should be able to save listings they are interested in for further review.
- In-app Messaging: This feature should enable users to communicate directly within the system enhancing convenience.
- Listing Presentation: Each listing should incorporate pictures and relevant details like examples (ex: yugo 1 bed) for precise references from users.

Ideal Skills and Experience:
- Previous experience in real estate or classified ad app development is preferred.
- Proficiency in both iOS and Android app development.
- Strong understanding of in-app messaging systems.
- Familiarity with implementing intuitive search and filtering functionalities.

I'm hoping to have the project concluded within the next month. Please share your previous related work in your proposal.