Referentia Systems has been building cybersecurity and network solutions out of Honolulu since 1996. The Department of Defense is a primary client, which is unsurprising given Hawaii's federal footprint, but the firm also serves commercial customers. Referentia develops software for identifying and remediating network security problems, and does consulting work around data safety standards and compliance. The company sits in the Mapunapuna area near the airport and employs somewhere in the range of 51 to 200 people.