Hello Dear, I've read your project description and I can design and build an Professional and High Quality app and website for visitor management system as per your requirements with complete mobile responsive design. Do you want Hybrid or native mobile app?
Let's have a quick discussion about the project.
We have extensive experience in designing and developing Portals, Web and Mobile application, E-commerce in all major platforms, etc.
I am sharing our portfolio with you have a look,
https://www.freelancer.com/u/junkyfunky
Thanks,
Faizan