What about Huayang International Design Group? I graduated for 3 years and worked as a HVAC designer.

Huayang International Design Group was established in June 2000. Headquartered in Shenzhen, it has six companies including Shenzhen, Guangzhou, Shanghai, Changsha, Chongqing and Hong Kong, as well as construction industrialization company, BIM technology application research institute and cost consulting company. There are more than 2000 employees. The company has comprehensive Grade A qualification for architectural design and Grade B qualification for planning and design. It is the first national design enterprise "National Housing Industrialization Base". Won the honor of top ten private design enterprises in China, outstanding private enterprises in China, the most powerful engineering survey and design unit in China, and the industry leader of the year.

With more than ten years' persistence in the field of R&D architecture and persistent pursuit of construction industrialization research and BIM technology research, Huayang International won the title of "National High-tech Enterprise", became the first design enterprise in China to win the title of "National Housing Industrialization Demonstration Base", and was a well-deserved leader in the field of construction industrialization. At the same time, as the first government BIM project implementation standard maker in South China, Shenzhen BIM Engineering Laboratory was established in Huayang International.