Cybersecurity Firewall Analyst

Important Application Submission Information

In order to ensure your application is successfully received before the job posting expires, please submit your application by 11:59 PM on Saturday, August 1, 2026

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Position Summary

The Cybersecurity Network Defense Analyst (CNDA) is responsible for protecting Operational Technology (OT) environments, including substation networks, against unauthorized cyber activity through the governance, validation, and continuous monitoring of network defense controls. This role ensures that security technologies, access controls, and network segmentation strategies are implemented and maintained in alignment with NERC CIP standards (e.g., CIP-005, CIP-007, CIP-010), TSA Security Directives, SOX controls, and PCI-DSS requirements.

The CNDA operates within a compliance-driven, risk-based framework, with primary accountability for independent validation and oversight of firewall configurations, rule changes, and network security controls. This includes reviewing and approving firewall rule sets, verifying adherence to least privilege and segmentation requirements, and ensuring all changes are properly authorized, documented, and auditable. The role emphasizes control effectiveness validation rather than direct implementation, ensuring separation of duties and alignment with audit expectations.

This position supports OT/substation defense operations by maintaining strong visibility into Electronic Security Perimeters (ESPs), External Routable Connectivity (ERC), and access pathways into critical infrastructure environments. Responsibilities include control testing, evidence generation, and audit support, as well as identifying and remediating compliance gaps through structured corrective actions. In addition, the CNDA contributes to incident response, event analysis, and service disruption investigations, performing root cause analysis with a focus on control effectiveness and preventive improvements. The role actively participates in CIP-010 baseline management and change validation processes, ensuring that all network security modifications are properly assessed, validated, and reflected in system baselines. The CNDA also supports project-based initiatives related to substation defense, firewall deployments, and network segmentation enhancements, providing oversight to ensure solutions are implemented in accordance with regulatory requirements and internal security standards. This includes maintaining accurate documentation and artifacts required to demonstrate compliance during internal and external audits. Candidates with a strong background in network engineering, OT networking, or infrastructure design who are transitioning into cybersecurity will be considered, particularly those with the ability to apply technical expertise within a highly regulated, audit-focused environment.

Responsibilities

• Perform day-to-day oversight and validation of firewall policy administration, including review, approval, and lifecycle management of network access control rules on specialized cyber defense systems

• Review, validate, and govern network access control lists (ACLs) to ensure alignment with least privilege, segmentation requirements, and regulatory expectations

• Participate in security improvement and optimization initiatives, providing recommendations to enhance control effectiveness, resiliency, and compliance posture

• Maintain accurate and up-to-date documentation of network security infrastructure, configuration changes, and security strategies to support audit readiness and operational transparency

• Develop and support testing and validation procedures for network security controls, ensuring changes are properly assessed and meet compliance requirements prior to implementation

• Collaborate with security architecture and engineering teams to interpret, apply, and enforce security requirements within OT and substation environments

• Provide oversight of network defense system lifecycle activities (installation, configuration, testing, and maintenance), ensuring implementations meet regulatory and internal standards

• Support and provide regulatory guidance for project-based firewall and network security deployments

• Proactively identify security risks, control gaps, and compliance issues, and recommend co