He has been involved in the development of many of the technologies that enable interactive web pages, such as the JavaScript language.

Shaver attended high school at Lisgar Collegiate Institute in Ottawa, where he began working with Ingenia Communications Corporation, an Ottawa-area computer consultancy that later dissolved.

Shaver eventually left to work at Netscape Communications[1][2] and later zerøknowledge, Cluster File Systems, and the Oracle Corporation.

[3] Beginning as a visiting developer, he quickly rose through the ranks and eventually gained Internet fame by becoming a founding member of the Mozilla Organization in 1998.

[7] Shaver was also at the center of the "ten fucking days" imbroglio wherein he wrote on his business card "ten fucking days"[8] referencing a recent ten-day turnaround for a security flaw from notification to releasing a fixed version of Firefox.