Principal Network Security Engineer

Alarm.com; Tysons (VA); On-site; USD 100,000 - 130,000; Full time

Benefits offered by this job

Collaborative team environment

Opportunity for immediate impact

Diverse experience across business areas

Fun corporate events

Job summary

A leading cloud-based security platform in Tysons, Virginia, is seeking a Principal Network & Security Engineer to manage Cisco-based networking infrastructure. You will be responsible for optimizing network security, conducting vulnerability management, and collaborating with teams to implement secure architectures. This position requires hands-on experience with Cisco systems and a solid understanding of network security principles.You will work in a dynamic environment with high standards for performance and collaboration.

Qualifications

• At least 7 years of experience in enterprise networking and security.
• Hands-on experience with Cisco platform management.
• Must have strong understanding of network firewalls and intrusion systems.

Responsibilities

• Administer and optimize Cisco network infrastructure.
• Ensure secure access and network segmentation.
• Monitor network for anomalous behavior and investigate incidents.

Skills

Cisco platform management

Network firewalls

Intrusion detection prevention

Scripting

Cloud security fundamentals

Vulnerability management

Education

Bachelor’s degree in computer science or related field

Tools

Cisco firewalls

Cloud platforms (AWS, Azure, GCP)

Job description

Overview

The Principal Network & Security Engineer is responsible for the management, lifecycle operations, and security of the organization’s Cisco-based networking infrastructure. This role leads the administration, configuration, monitoring, and ongoing optimization of core network systems and platforms, applying best practices in security management 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 Alarm.com?

• 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 Alarm.com team!
• Gain well rounded experience: Alarm.com offers a diverse and dynamic environment where you will get the chance to work directly with executives and develop expertise across multiple areas of the business.
• Focus on fun: Alarm.com places high value on our team culture. We even have a committee dedicated to hosting a stand-out holiday party, happy hours, and other fun corporate events.
• Alarm.com values working together and collaborating in person. Our employees work from the office 4 days a week.

Company info

Alarm.com is the leading cloud-based platform for smart security and the Internet of Things. We serve millions of homes and businesses with innovative technology across AI, video analytics, facial recognition, machine learning, and energy analytics.

Note: This description reflects current requirements and does not imply any guarantees of employment. All eligible applicants will be considered for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status.