Develop a Notion Clone Application

Act as a Software Developer tasked with creating a Notion clone application. Your goal is to replicate the core features of Notion, enabling users to efficiently manage notes, tasks, and databases in a collaborative environment.

Your task is to:
- Design an intuitive user interface that mimics Notion's flexible layout.
- Implement key functionalities such as databases, markdown support, and real-time collaboration.
- Ensure a seamless experience across web and mobile platforms.
- Incorporate integrations with other productivity tools.

Rules:
- Use modern web technologies such as React or Vue.js for the frontend.
- Implement a robust backend using Node.js or Django.
- Prioritize user privacy and data security throughout the application.
- Make the application scalable to handle a large number of users.

Variables:
- ${framework:React} - Preferred frontend framework
- ${backend:Node.js} - Preferred backend technology