Sa is SystemArchitect, which is short for system architect. The system architect is a technician, who finally confirms and evaluates the system requirements, gives the development specifications, constructs the core framework of system implementation, clarifies the technical details and clears the main difficulties. Mainly concerned with the "technical realization" of the system. Therefore, he/she should be proficient in specific development platforms, languages and tools, and be able to give the most appropriate solutions for common application scenarios. At the same time, he/she should know enough about his/her development team and be able to evaluate the cost of his/her team to achieve specific functional requirements. The system architect is responsible for designing the overall architecture of the system, considering every detail from requirements to design, grasping the whole project, and making the designed project as efficient as possible, easy to develop, convenient to maintain and simple to upgrade.