The 3,130-square-foot house was built in 1997 in Redmond West.
Mr. Nikaido has been a senior software engineer at Zynga, a social network game developer headquartered in San Francisco.
He previously was a senior software engineer at CA Technologies, which is in the computer software industry. He also worked for Xeriton Corporation, Microsoft Corporation, Holten, White and Associates, and Fourth Shift Corporation.
He attended Carleton College.
Ms. Nikaido has been an adviser at Cascadia College.
She previously was associate director of alumni relations at the University of Washington's Michael G. Foster School of Business. She also held key positions at the University of Puget Sound and Evergreen Hospital and Medical Center.
She studied at Seattle Pacific University and Western Washington University.
According to BlockShopper.com, there have been 137 home sales in Duvall during the past 12 months, with a median sales price of $660,000.
Address: 28601 Northeast 63rd Way
Buyer(s): Michio Nikaido and Maureen Nikaido
Seller(s): Michio Nikaido
Sale date: Aug. 6, 2009