Janszoon served in the Netherlands East Indies in the periods 1603–1611 and 1612–1616, including as governor of Fort Henricus on the island of Solor.
Janszoon bekerja untuk Hindia Belanda selama beberapa periode (1603–1611, 1612–1616, termasuk periode sebagai gubernur Benteng Henricus di Pulau Solor.