Web App Development

I'm looking for an experienced developer to create a web app with multiple features, both backend and frontend that could hypotheically serve for a business. The project requires step-by-step code walkthroughs, a comprehensive report on the app, and detailed planning documentation.

Key Requirements:
- Build a robust web app for business use.
- Provide step-by-step code explanations.
- Write a detailed report on the web app.
- Evidence of planning for each development step, including:
- Features to be built
- Challenges to address
- Technologies utilized and their purposes

Ideal Skills and Experience:
- Proficiency in both frontend and backend development
- Strong documentation and communication skills
- Experience in web app planning and execution
- Familiarity with user authentication, real-time data updates, and payment processing is a plus