SI International Awarded $20 Million Department of Homeland Security Contract

Oct. 15, 2007

RESTON, Va., Oct. 15 /PRNewswire-FirstCall/ -- SI International, Inc. (Nasdaq: SINT), an information technology and network solutions (IT) company, announced today that it was awarded a new prime contract with the Department of Homeland Security U.S. Immigration and Customs Enforcement (DHS USICE). SI International will provide bond control specialists to review bond actions and manage case inquiries associated with alien files. The contract has a six- month base period with four one-year option periods. The contract value is approximately $20.5 million, inclusive of the options. The value of the contract win was included in the October 11, 2007 news release announcing awards in excess of $450 million for the month of September.

USICE Office of Detention and Removal Operations' mission is to ensure the departure of all removable aliens from the United States . A key record's function of this activity is the review, update, and disposition of bonds associated with these aliens.

This past month, SI International was awarded a $225 million contract supporting DHS U.S. Citizenship and Immigration Services' (USCIS) Service Center Operations in Nebraska and Texas. The company also supports USCIS Office of Records services with the tracking and accounting of more than 62 million immigration files.

"This contract win demonstrates our continued focus on delivering measurable efficiencies to the Federal government through record services." said Brad Antle , President and Chief Operating Officer of SI International. "Mission-critical outsourcing will continue to be a major focus for SI International as the U.S. Government has a growing need for technical skills and IT expertise from the contractor community."

About SI International: SI International, a member of the Russell 2000 and S&P SmallCap 600 indices, is a provider of information technology and network solutions (IT) primarily to the federal government. The Company combines technology and industry expertise to provide a full spectrum of state-of-the- practice solutions and services, from design and development to documentation and operations, to assist clients in achieving their missions. SI International is ranked as the 42nd largest Federal Prime IT Contractor by Washington Technology and has approximately 4,700 employees. More information about SI International can be found at http://www.si-intl.com.

The above-referenced statements may contain forward-looking statements that are made pursuant to the safe-harbor provisions of the Private Securities Litigation Reform Act of 1995. Expressions of future goals, financial information or reporting, and similar expressions reflecting something other than historical fact are intended to identify forward-looking statements, but are not the exclusive means of identifying such statements. These forward- looking statements may involve a number of risks and uncertainties, which are described in the Company's filings with the Securities and Exchange Commission. These risks and uncertainties include: changes in federal government (or other applicable) procurement laws, regulations, policies and budgets; risks relating to contract performance; changes in the competitive environment (including as a result of bid protests); and the important factors discussed in the Risk Factors section of the annual report on Form 10-K filed by the Company with the Securities and Exchange Commission and available directly from the Commission at www.sec.gov. The actual results may differ materially from any forward-looking statements due to such risks and uncertainties. The Company undertakes no obligations to revise or update any forward-looking statements in order to reflect events or circumstances that may arise after the date of this release.

Contact: Alan Hill VP, Corp. Communications 703-234-6854 [email protected]

SOURCE SI International, Inc.

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