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Principal Network Security Engineer

Alarm.com
Tysons, Virginia
Full Time
Posted January 28, 2026
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Job Description

The Principal Network Security Engineer manages and secures Cisco-based network infrastructure, overseeing configuration, monitoring, and security operations across hybrid cloud and on-premises environments, while providing technical leadership and ensuring best practices in network security.

Key Responsibilities

  • Manage, configure, monitor, and optimize Cisco networking infrastructure including firewalls, identity, and analytics platforms.
  • Perform routine software, firmware upgrades, patching, and configuration updates on network and security appliances.
  • Configure and enforce network access controls to ensure secure network segmentation and access.
  • Manage secure remote access solutions for users and devices.
  • Deploy, configure, and tune next-generation perimeter and detection tools to enforce security policies.
  • Oversee application delivery and web application security, including WAF configuration and incident response.
  • Monitor network telemetry for security events and respond to incidents across on-premises and cloud environments.
  • Support threat protection systems, including DDoS mitigation, and report suspicious activities.
  • Collaborate with teams to design and implement secure, compliant architectures in cloud and data center environments.
  • Participate in vulnerability management, remediating security exposures.
  • Conduct security event and log analysis to improve detection capabilities.
  • Develop and maintain documentation, runbooks, and operational standards for network security.

Requirements

  • Bachelor’s degree in computer science, Engineering, or related field.
  • Minimum 7 years of experience with enterprise networking and security, with significant hands-on Cisco platform management.
  • Strong understanding of network firewalls, perimeter defense, and intrusion detection prevention.
  • Direct experience configuring and troubleshooting network access control systems and policies.
  • Familiarity with cloud platform security fundamentals AWS, Azure, or GCP in hybrid enterprise environments.
  • Practical knowledge of software, firmware, and patch management for large-scale infrastructure.
  • Proficiency in troubleshooting layer 2 and 3 networking, VPNs, and secure remote access solutions.
  • Experience with application delivery controllers and web application security.
  • Ability to analyze network endpoint telemetry and investigate security events or performance issues.
  • Demonstrated skills using scripting or automation to streamline network security management.
  • Hands-on experience supporting vulnerability management and compliance requirements.
  • High attention to detail, documentation, and change management practices.
  • Excellent communication, collaboration, and mentoring skills.

Benefits & Perks

Competitive pay
Subsidized medical plan options
HSA with generous company contribution
401(k) with employer match
Paid holidays
Wellness time
Vacation increasing with tenure
Paid maternity and bonding leave
Company-paid disability insurance
Company-paid life insurance
FSAs (Flexible Spending Accounts)
Well-being resources and activities
Casual dress work environment

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