The technical director (CTO) is: responsible for the company's R&D and technical management work, planning the company's technical development route and new product development, and achieving the company's technical innovation goals.

CTO--Chief Technology Officer, is the manager of technical resources. His responsibilities are to grasp the overall technical direction, guide and check the technology selection and specific technical issues, and complete the various technical tasks/projects assigned;

In many companies, especially small companies, CTO is also called technical director, but large companies may have many technical directors in charge of different departments, such as Tencent, Alibaba, etc.

Chief Architect --- Mainly responsible for the management and construction of the architect team, as well as the review of the business and technical architecture of major products. If it is a small company, it is an architect;

Vice President of Engineering --- It seems that this position is mostly established in real estate and government departments