Custom AI Web Tool Development

Hi,
I am looking to build a simple MVP for a web-based AI clinical assistant called *******.
The tool is intended for healthcare professionals (doctors, nurses, pharmacists, and medical students) to ask clinical questions and receive structured, evidence-based answers. Core Features:
Chat interface similar to ChatGPT
Integration with OpenAI API
Structured medical responses in the following format:
Summary
Differential diagnosis
Recommended investigations
Management plan
Red flags
References (can be general for now, no need for real citations)
Clean, simple, and responsive UI
Technical Expectations:
Frontend: simple web interface (React or similar)
Backend: API integration (Node.js or Python)
Secure and scalable basic architecture
Nice to Have (Optional):
User login system
Admin panel
Ability to upload PDFs (for future use)
Important Notes:
This is an MVP, so speed and simplicity are key
I already have a structured prompt for the AI responses
The goal is to build a working prototype first, then improve later
Please share:
Examples of similar AI/chatbot projects you have built
Your proposed approach (simple explanation)
Estimated timeline
Cost
Looking forward to working with you