Mobile App Development for Existing Website

I need a mobile app developed for both iOS and Android that mirrors the functionalities and design of my website, https://derechtsepen.org/.

Requirements:
- Replicate all core functionalities from the website
- Maintain the same design as the website

Ideal Skills and Experience:
- Proven experience in mobile app development for both iOS and Android
- Strong UI/UX design skills to ensure website design is accurately reflected
- Familiarity with website-to-app conversion processes
- Knowledge of backend integration to ensure all website features work seamlessly on the app

Please provide examples of similar work done. developer of https://derechtsepen.org/ willing to work together