Hi, I'd suggest you start by first identifying a problem that needs to be solved and then determine if some web decision is the best approach. The app solution issues are much easier when you have a clear understanding of what the product should be doing. I can recommend Evrone evrone.com/hr-tech to deal with as the most experience software development company. Just look their works on website I worked with them for my last project.
You can easily do a quick Google search to know which companies serve mobile app development services. However, make sure the company you pick follows some trusted QA and reliable testing measures to deliver effective results aligning with your business goals. Also, take care of the fact that a good mobile application development company must provide you with the time-to-time progress report of your app development.