Mid-Senior Network Engineer

Apply for the Mid‑Senior Network Engineer role at Infinity Systems Engineering
.

Infinity Systems Engineering provides a base pay range of $ – $ per year. Actual compensation will be based on skills and experience.

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 is a self‑starter who can work independently while contributing effectively in a collaborative, fast‑paced team setting.

• 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.
• 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.
• 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.
• 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.
• 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.
• 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.

• 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 pursuing a degree may be considered if the timeline aligns with the start date.
• Experience:
  
  5+ years in network engineering, administration, or related IT roles.
• Clearance: TS/SCI CI Poly.
• 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 and troubleshooting methodologies.
• Understanding of cybersecurity principles and network security best practices.
• Excellent problem‑solving and communication skills.
• Strong experience in Juniper switch configuration (Cisco experience is a plus).
• Proficient in Linux and Windows system administration.
• Active CompTIA Security+ CE or equivalent DoD 8570 baseline certification.
• Proven ability to work independently with minimal oversight.
• Familiarity with network protocols, VLANs, and DoD IT environments.
• Strong communication skills and a collaborative team mindset.
• Commitment to security best practices and thorough documentation.

• Industry certifications such as CCNA, CCNP, or equivalent.
• Experience with cloud networking (AWS, Azure, etc.).
• Familiarity with SD‑WAN and network automation tools.
• Knowledge of VoIP and wireless networking solutions.

• Primarily office‑based with occasional data…