I would like to create a mobile application for measuring carpentry, sliding window doors

I am planning to create a mobile application for measuring carpentry, sliding window doors for both iOS and Android platforms. As a part of this project, I need a backend for my app. Additionally, I'm also unsure if I need to integrate it with other services. Thus, I'm looking for a freelancer to help me build this application that meets all my needs.

If you think you have the skills and experience to successfully complete this project, I look forward to hearing from you.