×
Register Here to Apply for Jobs or Post Jobs. X

Principal Network Security Engineer

Job in McLean, Fairfax County, Virginia, USA
Listing for: Alarm.com
Full Time position
Listed on 2025-12-02
Job specializations:
  • IT/Tech
    Cybersecurity, Systems Engineer, Network Security
Job Description & How to Apply Below

The Principal Network & Security Engineer is responsible for the management, lifecycle operations, and security of the organization’s Cisco-based networking infrastructure. This individual will be expected to lead the administration, configuration, monitoring, and ongoing optimization of core network systems and platforms, as well as apply best practices in security management. The role combines technical operational management of critical Cisco platforms with broad information security responsibilities across hybrid cloud and on-premises environments.

Responsibilities
  • Administer, monitor, and optimize Cisco portfolio infrastructure, including firewalls, identity, and network analytics platforms.
  • Execute routine software/firmware upgrades, patching, and configuration updates on network and security appliances.
  • Ensure effective network segmentation and secure access by configuring and enforcing network access controls.
  • Manage and maintain secure remote access solutions for users and devices.
  • Deploy, configure, and tune next‑generation network perimeter and detection tools to ensure consistent policy enforcement.
  • Oversee application delivery and web application security solutions, assisting with WAF configuration and incident response.
  • Monitor network telemetry and activity for anomalous behavior or security events.
  • Respond to and investigate network, security, or operational incidents in both on‑premises and cloud environments.
  • Support DDoS and threat protection systems, maintaining readiness and reporting suspicious activity.
  • Collaborate with infrastructure and app teams to design and implement secure, compliant architectures across cloud and datacenter.
  • Participate in vulnerability management processes, remediating identified exposures across managed platforms.
  • Contribute to security operations, including event and log analysis, and improving detection capabilities.
  • Develop and maintain infrastructure documentation, runbooks, and operational standards.
  • Enable automation for repeatable network and security processes using scripting and modern tools.
  • Provide technical guidance and mentoring to junior staff on security best practices and platform operations.
  • Other duties as assigned
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 2/3 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.
  • Willingness to stay current on evolving security threats and industry best practices.
  • Relevant certifications (e.g., CCNP Security, CISSP, cloud security, or equivalent) are strongly preferred.

Please note that sponsorship of new applicants for employment authorization, or any other immigration‑related support, is not available for this position at this time.

WHY WORK FOR
  • Collaborate with outstanding people
    :
    We hire only the best. Our standards are high and our employees enjoy working alongside other high achievers.
  • Make an immediate impact
    :
    New employees can expect to be given real responsibility for bringing new technologies to the marketplace. You are empowered to perform as soon as you join the  team!
  • Gain well rounded experience
    :  offers a diverse and dynamic environment
To View & Apply for jobs on this site that accept applications from your location or country, tap the button below to make a Search.
(If this job is in fact in your jurisdiction, then you may be using a Proxy or VPN to access this site, and to progress further, you should change your connectivity to another mobile device or PC).
 
 
 
Search for further Jobs Here:
(Try combinations for better Results! Or enter less keywords for broader Results)
Location
Increase/decrease your Search Radius (miles)

Job Posting Language
Employment Category
Education (minimum level)
Filters
Education Level
Experience Level (years)
Posted in last:
Salary