Custom Data Management Web App Development

I'm seeking an experienced developer to build a customized web-based data management application, with a focus on appointment scheduling, and more. please try the preview to have a look at the UI (85% done)

Key Requirements:
- Appointment scheduling feature
- Ability to add lesson plans
Check here to learn more
https://id-preview--8cc2380e-c45b-4682-ab64-e8c8c3cca247.lovable.app/login
We want to build this app on the web, with SuperAdmin Controls

Ideal Skills:
- Proficiency in web development
- Experience with data management applications
- Familiarity with appointment scheduling functionalities
- Strong problem-solving skills
- Ability to work collaboratively with a tech team

Please provide a detailed plan on how you would approach this project, including timeframe and cost.