I want to create SAAS Project that can do the following

Hi All
I want to build a SAAS app project that offers a single and bulk email verification service for customers including creating an API so the customers can use the app on their sign-up forms in real-time. I have attached some examples for similar online platforms that you can check. I do need only those who have experience creating these kinds of saas projects, especially which belong to the email verification service. The project should be complete in full front-end and back-end development. Please check the attached document and the mentioned example platforms before bidding on this project, so I know you have the experience to create a similar project for me.