Hello,
I work with React in a daily basis, considering myself proficient on it. I read carefully the description of your project and I'm 100% confident that I can deliver it to you in the desired quality.
In case you accept my services this will be my first Freelancing job, so I don't want to disappoint you, and to give you some guaranties about my dedication, please review my purposed milestones which I consider they are fair, and also at any point that you are not satisfied with my work, you can easily continue the work with any other developer.
Best regards,
Tiago Neto