[1] Billmaier was responsible for Unix workstation products and strategies at Digital Equipment Corporation.

[2] From February 1992 through 1995, he was vice president and general manager of the networking software division at Sun Microsystems in Mountain View, California.

[2][3] Billmaier became the founding CEO of Digeo in 1999 where he led the acquisition of the Moxi product line in 2002.

[7] Billmaier is a founding partner of Charge Northwest, an electric vehicle infrastructure advisory and software integration company.

[1][8] Billmaier was an executive producer of the Academy Award nominated documentary, Chasing Ice.