From Open‑Source Pioneer to Didi VP: The Tech Journey of Zhang Wensong

21CTO community introduces Zhang Wensong, a renowned open‑source technology expert who rose from a coder to a senior architect in China’s internet industry.

Zhang was born in 1973, earned a doctorate from the National University of Defense Technology, and co‑invented the load‑balancing software LVS.

During his university years he promoted open‑source technologies and contributed to early projects such as a graphical ticketing system for Guangzhou railway station, OCR codec development, and campus network construction.

After graduating, he worked at Taobao (code‑named "Zhengming") as a senior researcher, developing CDN, TFS, Tengine and later leading Alibaba Cloud’s core products (ECS, RDS, OSS, CDN, SLB), while championing open‑source culture within Alibaba.

In 2016 he left Alibaba to join Didi as senior vice president, leading foundational research, smart‑traffic initiatives, and open‑source projects like VirtualAPK, leveraging Didi’s massive data to improve urban transportation.

When did you first encounter computers? He recalls playing arcade games in middle school, joining a computer club at Shanghai Youth Science Guidance Station, and learning BASIC, Pascal, 6502 assembly, and even writing a Chinese OS on an Apple machine.

What was university life like? He joined labs, built a graphical ticketing system, developed OCR codec components, and helped network a SUN computer lab, gaining deep TCP/IP knowledge.

He and his mentor Professor Hu Shouren received CCF Outstanding Engineer and Education awards.

Graduate projects? He participated in large‑scale projects like the Changsha Information Port, handling a 27‑million‑yuan planning effort and hands‑on server installations.

First open‑source project – LVS In 1998, motivated by the high price of a commercial load balancer, he spent two weeks writing a simple Linux‑based LVS system, released it online, and quickly attracted global users and contributors.

He emphasizes that open‑source brings broader adoption, continuous improvement, and showcases technical strength.

Entrepreneurial ventures His first startup in 2000 raised 3.5 million CNY from angel investors but failed during the dot‑com bubble, teaching him valuation and equity planning. A second startup in 2003 created Bitcool.tv, an early video platform, and TelTel VoIP service with over 2 million users.

Throughout his ventures he remained committed to open‑source, releasing non‑confidential projects publicly.

After a brief hiatus in 2009, he rejoined Alibaba, contributing to core systems such as specialized computing, databases, kernel, LVS, image search, big‑data storage, and cloud computing, enabling massive cost savings and performance gains for Taobao’s “Double 11” sales.

At Didi, he leads smart‑traffic innovation, using massive ride‑hailing data to improve traffic flow, optimize signal timing, and develop the Didi Traffic Information Platform.

In 2017 he was elected chair of the CCF Technical Frontier Committee, continuing to promote knowledge sharing in the field.

His personal philosophy stresses following one’s interests, focusing on expertise, and maintaining a balanced mindset.

Key takeaways – Pursue your passion, specialize, stay curious, and keep a humble, steady attitude.