You'd think nothing would get under the skin of search giant Google.

But co-founder Sergey Brin is so rattled by the launch of Microsoft's rival search engine that he has assembled a team of top engineers to work on urgent upgrades to his Web service, The Post has learned.

Brin, according to sources inside the tech behemoth, is himself leading the team of search-engine specialists in an effort to determine how Bing's crucial search algorithm differs from that used by the company he founded in 1998 with Stanford University classmate Larry Page.

"New search engines have come and gone in the past 10 years, but Bing seems to be of particular interest to Sergey," said one insider, who spoke on the condition of anonymity.

The move by Brin is unusual, as it is rare these days for the Google founders to have such hands-on involvement in day-to-day operations at the company, the source added.

A spokesman for Google declined to comment about Brin's interest in Bing but said: "We always have a team working on improving search."

He added: "We dedicate more time and energy to search than anything else in our company. Our algorithm is constantly evolving."

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