Senior Systems Engineer / Infrastructure Engineer (Lead)

Description: Marathon TS is seeking a Senior Systems Engineer / Infrastructure Engineer (Lead) to support a major DoD Joint Program Office IT Support Services program. This role provides senior-level technical leadership across enterprise infrastructure, systems engineering, and network services supporting a globally distributed, mission-critical defense environment.
The engineer will be responsible for planning, integrating, maintaining, and securing complex IT systems across hardware, software, and network domains. This position supports full lifecycle operations including design, implementation, sustainment, modernization, and cybersecurity compliance in accordance with DoD standards.
Primary Responsibilities:

• Integrate, plan, coordinate, and facilitate enterprise information system activities
  
• Lead hardware and software upgrades, system design, and network development initiatives
  
• Support maintenance, performance, and security of enterprise networks
  
• Analyze organizational IT requirements (short- and long-term) from operational and strategic perspectives
  
• Ensure system availability, continuity, and information assurance
  
• Recommend and support continuous process improvement initiatives
  
• Perform formal software verification, validation, and automated testing
  
• Implement and maintain security tools and applications (e.g., Websense, ISA, McAfee HBSS)
  
• Administer SQL and Oracle database environments
  
• Develop and debug software in real-time, embedded, and multi-processor environments
  
• Maintain compliance with DoD Information Assurance policies and procedures
  
• Lead small technical teams (≤25 personnel) through solution design, development, integration, and deployment
  

Required Technical Experience:

• VMware Infrastructure / vSphere
  
• Storage platforms: NetApp, EMC, SAN, NAS, Tape Arrays
  
• Microsoft Exchange & Active Directory (Windows 2003/2008 environments)
  
• Core network services: DNS, DHCP, PKI
  
• Web collaboration platforms (SharePoint, Oracle WebCenter Interaction)
  
• Java development (JDK, Eclipse, LEWIT, Kona)
  
• Linux and Windows operating systems
  
• Object-Oriented software design
  
• COTS integration (Oracle, WebMethods, ClearCase)
  

Education & Experience Requirements:

• MA/MS in Engineering, Computer Science, or related technical discipline
  
  • OR BA/BS + 6 additional years of experience in lieu of MA/MS
    
• 15+ years total experience in a relevant engineering or science field
  
• 4+ years in project planning, solution development, testing, and technical documentation
  
• 5+ years Microsoft Exchange experience
  
• 5+ years Active Directory administration
  
• 5+ years core network services administration
  

Certifications (Required / Preferred):

• IAT Level III (DoD 8570 / 8140 compliant) - or ability to obtain within 6 months of TOA
  
• CCNA and/or CCNP
  
• MCITP / MCTS (or modern Microsoft role-based equivalent such as Microsoft 365 Administrator Expert (MS-102), Azure Administrator Associate (AZ-104), Windows Server Hybrid Administrator (AZ-800/801), or Azure Security Engineer (AZ-500))
  

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Marathon TS is committed to the development of a creative, diverse and inclusive work environment. In order to provide equal employment and advancement opportunities to all individuals, employment decisions at Marathon TS will be based on merit, qualifications, and abilities. Marathon TS does not discriminate against any person because of race, color, creed, religion, sex, national origin, disability, age or any other characteristic protected by law (referred to as "protected status ").