Cambridge, Mass.--Sapient Corp., an electronic-services consultancy that works with United Airlines, Adobe Systems and others, announced its year-end results Friday. The company reported net income for the year of $30.3 million, a 224% increase from 1998's net income of about $9.4 million. For the fourth quarter, net income increased 692% to about $9.5 million, from about $1.2 million for the year-earlier period. Revenue for 1999 climbed 68% to about $276.8 million from $164.9 million in 1998. In the fourth quarter of 1999, revenue increased 52% to about $81.8 million from about $53.8 million during the year-earlier period.