Key deliverables for full-stack development typically include:

1. Project Planning:

1. • A detailed project plan outlining the scope, timeline, and milestones of the full-stack web development project.

2. Requirements Specification:

1. • Clear documentation of functional and non-functional requirements based on stakeholder needs, covering both front-end and back-end aspects.

3. System Architecture:

1. • Design and documentation of the overall system architecture, including the front-end and back-end components, databases, and communication protocols.

4. User Interface (UI) Design:

1. • Design mockups and prototypes for the user interface, ensuring a user-friendly and visually appealing web application.

5. User Experience (UX) Design:

1. • Focus on creating a seamless and enjoyable experience for users across the web application.

6. Front-end Development:

1. • Implementation of the user interface design using technologies such as HTML, CSS, and JavaScript, ensuring responsiveness and cross-browser compatibility.

7. Back-end Development:

1. • Development of server-side logic, databases, and application functionality using server-side scripting languages (e.g., Node.js, Python, Ruby, Java).

8. Database Design:

1. • Design and implementation of a robust database structure to store and retrieve data efficiently.

9. API Development:

1. • Creation of application programming interfaces (APIs) to facilitate communication between the front-end and back-end components.

10. Authentication and Authorization:

1. • Implementation of secure user authentication and authorization mechanisms to control access to different parts of the application.

11. RESTful Services:

1. • Development of RESTful services to enable data exchange between the client and server in a standardized and efficient manner.

12. Version Control:

1. • Utilization of version control systems (e.g., Git) to track and manage changes to the codebase.

13. Testing:

1. • Rigorous testing of both the front-end and back-end components to identify and fix bugs, ensure functionality, and enhance overall performance.

14. Deployment:

1. • Successful deployment of the web application to a production environment, ensuring that it is accessible to users.

15. Monitoring and Logging:

1. • Implementation of monitoring and logging mechanisms to track the performance and troubleshoot issues in the application.

16. Security Features:

1. • Implementation of security measures to protect against common web vulnerabilities, such as cross-site scripting (XSS) and SQL injection.

17. Error Handling:

1. • Establishment of robust error handling mechanisms to provide users with meaningful error messages and ensure graceful degradation.

18. Scalability Planning:

1. • Consideration of scalability factors and implementation of strategies to handle increased user loads and data growth.

19. Documentation:

1. • Comprehensive documentation that includes user manuals, system architecture, and code documentation for future reference and maintenance.

20. Continuous Integration/Continuous Deployment (CI/CD):

1. • Implementation of CI/CD pipelines to automate the process of building, testing, and deploying the application.

21. Training:

1. • Training materials and sessions for administrators and other stakeholders to effectively use and manage the web application.

22. Maintenance and Support Plan:

1. • A plan for ongoing maintenance, support, and updates to ensure the continued smooth operation of the web application.

Coming to an agreement on the abovementioned deliverables based on realistic timelines with adequate resources is in our opinion the best practice approach that contributes to the highest probability of successful development and deployment of Full-Stack web applications.