Company Overview

For 30 years, clients in the private and public sectors have relied upon SOS International LLC (SOSi) for critical operations in the world’s most challenging environments. SOSi is privately held, was founded by its current ownership in 1989, maintains corporate headquarters in Reston, VA, and specializes in providing logistics, construction, training, intelligence, and information technology solutions to the defense, diplomatic, intelligence and law enforcement communities.

All interested individuals will receive consideration and will not be discriminated against on the basis of race, color, religion, sex, national origin, disability, age, sexual orientation, gender identity, genetic information, or protected veteran status. SOSi takes affirmative action in support of its policy to advance diversity and inclusion of individuals who are minorities, women, protected veterans, and individuals with disabilities.

5-190606-9101: Cyber Security Engineer
LocationU.S. - Virginia - Chantilly
Open Date6/6/2019

STG, a wholly owned subsidiary of SOS International LLC (SOSi), is seeking a Cyber Security Engineer in Chantilly VA. The ideal candidate is someone who will possess experience Computer Network Defense (CND) applications and systems.

Essential Job Duties
• Performs system administration of specialized CND applications and systems to include installation, configuration, maintenance, patching, and back-up/restore.
• Manages and administers the updating of rules, signatures, and custom content for specialized CND applications and systems.
• Administers CND test beds and tests and evaluates new CND applications or tools, rules/signatures, access controls, and configurations of CND platforms.
• Identifies potential conflicts with implementation of any CND tools within the enterprise and develop recommendations to remediate these conflicts.
• Creates, maintains, and refines network traffic flow diagrams for the enterprise network which reflect the current state of all security applications.
• Provides subject matter expertise in creation, editing, and management of signatures, rules and filters for specialized network defense systems including but not limited to network and host-based IDS, IPS, firewall, web application firewall, proxy and SIEM systems.
• Contributes to the completion of milestones associated with specific projects. Provides solutions to a variety of complex technical problems.


• TS/SCI w/CI Poly Security Clearance
• Education: BS
• Experience in a related security technology or discipline such as Identity and Access Management, Cybersecurity Operations, Cybersecurity Engineering, IT Security Audit, and Information Assurance.
• IAT II certification (Security+CE, CCNA Security, SSCP) desired


• Fluency in a foreign language.

• Normal office working conditions with possible requirement to lift and/or move objects or packages of up to 25 lbs.
• Periods of non-traditional working hours including consecutive nights or weekends when necessary.