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Mid-Senior Network Engineer Security Clearance

Job in Alexandria, Fairfax County, Virginia, 22301, USA
Listing for: Infinity Systems Engineering, LLC
Full Time position
Listed on 2026-01-14
Job specializations:
  • IT/Tech
    Cybersecurity, IT Support, Systems Engineer, Network Security
Salary/Wage Range or Industry Benchmark: 140000 - 180000 USD Yearly USD 140000.00 180000.00 YEAR
Job Description & How to Apply Below
Position: Mid-Senior Network Engineer with Security Clearance
Salary Range: $ 140000.00 To 180000.00 (USD) Annually Infinity’s niche in the aerospace and defense industry is specialized solutions that help bridge the gap between space and ground. This is no small task, and we owe our success to our team who help us fulfill our mission; to match people with their legacies for betterment of the world. There is always a place at Infinity for a motivated, capable individual seeking a career to better the world.

We prioritize supporting our team through exceptional benefits, work-life balance, and structured career development. At Infinity, WE ARE MORE – now, come be more with us!

Job Summary:

We are seeking a skilled Systems Administrator/Network Engineer to join our mission-driven team. This position offers a broad scope of responsibilities, including network infrastructure management (switch deployment & configuration) and system administration in a classified environment. The ideal candidate will be a self-starter with the ability to work independently while also contributing effectively in a collaborative, fast-paced team setting. This role is ideal for someone with deep technical expertise, initiative, and experience supporting a mix of network and systems engineering and administration tasks.

Key Responsibilities:

Network Design & Implementation:
* Design and implement secure and scalable network infrastructure solutions.

* Configure and install network hardware, including routers, switches, firewalls, and wireless access points.

* Assist in developing network architecture to support business needs and growth.

* Configure, manage, secure, and troubleshoot Juniper and Cisco switches.

* Contribute to network and systems design in alignment with evolving mission requirements Network Administration & Maintenance:
* Monitor network performance, availability, and security.

* Perform routine maintenance, updates, and patches for network devices.

* Identify and troubleshoot network issues, ensuring minimal downtime and optimal functionality.

* Configure, manage, secure, and troubleshoot Juniper and Cisco switches.

* Perform systems administration on Windows and Linux platforms (updates, security, troubleshooting, management).

* Maintain secure high performance KVM systems in an operational environment.

* Harden systems in accordance with DoD STIGs.

* Conduct and support ACAS scans and remediation.

* Assist with property accountability systems and technical logistics.
Security & Compliance:
* Implement and maintain network security measures, including firewalls, VPNs, and access controls.

* Ensure compliance with industry standards, company policies, and regulatory requirements.

* Conduct network vulnerability assessments and respond to security threats.

* Support network VLANs, management & security, QoS, and routing protocols.

* Develop and maintain SOPs and technical documentation.
Technical Support & Troubleshooting:
* Provide Level 2/3 support for network-related issues.

* Collaborate with IT teams to resolve connectivity problems affecting users and business applications.

* Document network configurations, troubleshooting steps, and resolutions.

* Support a wide range of IT and infrastructure-related duties based on mission need.
Vendor & Stakeholder

Collaboration:

* Work with vendors and service providers to procure and maintain network equipment.

* Assist in evaluating new technologies and making recommendations for improvements.

* Coordinate with internal teams to support IT projects and initiatives.

Qualifications:

* Education:

4+ years’ experience and a bachelor’s degree in Computer Science, Computer Engineering, or related field, or a minimum of 8 years of experience in lieu of a degree. Candidates currently pursuing a degree may be considered if the timeline aligns with the position start.

* Experience:

5+ years of experience in network engineering, administration, or related IT roles.

* Clearance: TS/SCI, CI Poly

* Required Skills:

* Experience with network security, firewalls, and VPNs.

* Strong knowledge of networking protocols (TCP/IP, BGP, OSPF, VLANs, etc.).

* Proficiency in configuring and managing routers, switches, and firewalls.

* Experience with network monitoring tools…
Position Requirements
10+ Years work experience
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