Technical Specification Document (TSD)

A Technical Specification Document (TSD) is 

a comprehensive blueprint for a project, product, or system that details the technical requirements, design, and functionality. It serves as a guide for the development team, providing precise technical details for building the solution, ensuring everyone is aligned on the project's execution. A TSD covers aspects like the tech stack, architecture, data models, and timelines, acting as a single source of information for developers, testers, and other stakeholders. 
 

Key functions of a TSD:

• Technical blueprint: It outlines exactly how a system will be built, including the specific technologies, databases, and APIs to be used.
• Development guide: It provides detailed instructions for the development team to build the functionality described in functional requirements documents.
• Alignment tool: It ensures that the development team, stakeholders, and testers are all on the same page regarding what needs to be done and how.
• Project management tool: It serves as a reference point for project control, progress tracking, and managing changes.
• Foundation for other work: It is the basis for creating architectural solutions, writing code, and developing test scenarios.

What a TSD typically includes:

• Technical overview: A high-level description of the solution.
• Design analysis: Detailed analysis of the technical design.
• Data models: How data will be structured and transformed, including mapping from existing systems to the new system's data fields.
• Architecture: Diagrams and descriptions of the system's architecture, such as microservices and their interactions.
• API endpoints: Details on the endpoints that will be available for services to communicate.
• Technology stack: The specific programming languages, frameworks, databases, and other tools to be used.
• Development and testing strategies: Guidelines for how the project will be developed and how it will be tested.
• Timelines and milestones: The planned timeline for development and key milestones.
• Security and privacy measures:Specifications for how security and privacy will be handled.