In 2006, van Biljon left Amazon Web Services and later started a venture with Chris Pinkham. The company, Nimbula, was focused on Cloud Computing software and was funded by Sequoia Capital and Accel Partners. In March 2013, Nimbula was acquired by Oracle Corporation.

Van Biljon co-founded Mosaic Software. Mosaic built the Postilion payment system, the first high-end payment transaction switch for commodity hardware and operating systems (Windows). Mosaic’s investors included GE and Paul Maritz. The company became one of the top three payment processing software vendors in the world and was sold in 2004 to S1 Corp.

Willem van Biljon (born 1961) is an entrepreneur and technologist born, raised and educated in South Africa.