About Us


Yarekx IT Consulting LLC was founded by  Jaroslaw “Yarek” Biernacki  in 2006 in Reston, VA, within the Washington, D.C. Metropolitan area.  


Mr. Biernacki’s experience consists of 27 years in computers and networks, 20 years in information security / assurance, 16 years in information system (IS) security auditing, 14 years in project management, 14 years in penetration testing and vulnerability assessment, 14 years in application security, 14 years supporting government client’s, and 6 years in supporting commercial companies in telecommunication, financial services, and banking industry, including Core Banking System (CBS) Information Systems (IS) security audits.


Mr. Biernacki’s education includes ~50 IT certifications (including CISSP, CISA, CISM, GWAPT, LTP, ECSA, CEH, CCDP, CCNP, MSCE, Network+, A+, and others), 100+ courses, a Master Degree in Geography (1990), and a second Master Degree in Information Security (2004).


Since its foundation, Yarekx IT Consulting LLC is constantly increasing its portfolio of IT Security Consulting services and number of served clients.


List of served commercial clients:

  • Pacific Trust Bank   (PTB)
  • Regional Transportation Distict (RTD) Denver
  • Real Magnet   (e-commerce web site)
  • Vodafone, UK   (telecommunication carrier)
  • UUNET   (now MCI – telecommunication carrier)
  • Winstar   (Competitive Local Exchange Carrier)
  • OneMain.com   (ISP – Internet Service Provider)
  • PrimeCo   (Wireless communications provider)
  • Arnold & Porter   (Law firm)


List of served government clients:

  • Library of Congress (LoC)
  • Social Security Administration (SSA)
  • Federal Housing Finance Agency (FHFA)
  • United States Agency for International Development (USAID)
  • Department of Defense (DoD), Defense Security Service (DSS)
  • Department of Defense (DoD), Defense Information Systems Agency (DISA)
  • Department of Defense (DoD), Army National Guard Bureau's (ANGB)
  • Department of Health and Human Services (HHS), Program Support Center (PSC)
  • Department of Commerce (DOC), National Oceanic and Atmospheric Administration (NOAA)
  • Department of Education (DoED)
  • Department of Homeland Security (DHS), National Protection and Programs Directorate (NPPD)
  • Department of Homeland Security (DHS), Transportation Security Administration (TSA)
  • Department of Homeland Security (DHS), Federal Emergency Management Agency (FEMA)
  • Department of State (DoS), Bureau of Consular Affairs (CA)
  • Department of Labor (DOL), Employment Standards Administration (ESA)
  • Department of Health and Human Services (DHHS), Food and Drug Administration (FDA),


Yarekx IT Consulting LLC information:

  • D&B Data Universal Numbering System (D-U-N-S) number: 780-309-535
  • The Commercial and Government Entity (CAGE) Code: 4FDR8


  • North American Industry Classification System (NAICS) Codes:
    • 541512 - Computer Systems Design Services
    • 541513 - Computer Facilities Management Services
    • 541519 - Other Computer Related Services
    • 541611 - Administrative Management and General Management Consulting Services
    • 541690 - Other Scientific and Technical Consulting Services
  • Standard Industrial Classification (SIC) Codes:
    • 7373 - Computer Integrated Systems Design
    • 7376 - Computer Facilities Management Services
    • 7379 - Computer Related Services, Not Elsewhere Classified
    • 8742 - Management Consulting Services
    • 8748 - Business Consulting Services, Not Elsewhere Classified
    • 8999 - Services, Not Elsewhere Classified
    • 9199 - General Government, Not Elsewhere Classified

Contact Us Today!

Yarekx IT Consulting LLC

11745 Arbor Glen Way, Reston, VA

Washington, D.C. Metro, USA

Phone:  +1-703-989-9060

Fax:  +1-707-707-0760

E-mail:  jaroslaw.biernacki@yarekx.com

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© Yarekx IT Consulting LLC, 2015 | jaroslaw.biernacki@yarekx.com