Referentia Systems Inc., a Honolulu-based software engineering firm, said its opened a four-person office in San Diego to help the company service its Navy, government and corporate customers there.

Referentia said its employed staff in the Southern California city since 2005 and that its growth in San Diego warranted a larger office.

Referentia employs about 60 people at its Hawaii offices near Honolulu International Airport and about another 15 people in offices elsewhere in the world. The technology company was established in 1996.