Android & iOS App Development for Naszdystrykt.pl

I'm looking to have an application developed for my website, naszdystrykt.pl, which is an informational service. The aim is to have everything interconnected seamlessly across both Android and iOS platforms.

Core Requirements:
- The app should primarily display news and articles sourced from my website.
- I would like to implement a number of interactive features, including:
* Push notifications to keep users updated.
* User login and profiles to foster a community.
* A section for users to post local classified ads.
* A feature for marking their business on a map.
* A regional events calendar.

Platform-Specific Functionalities:
- I need a system in place for users to submit their own news.

Ideal Skills and Experience:
- Proven experience in cross-platform app development (Android and iOS).
- Prior work with news and informational service apps is a plus.
- Strong understanding of integrating user-generated content into an app.
- Experience with implementing push notifications and user profiles.
- Knowledge of integrating Maps into an app is essential.
- Competency in developing a regional events calendar.

The website is based on wordpress and does not have an inbuilt api.