[Hiring] Senior Cybersecurity Engineer / Information System Security Engineer @Seneca Holdings

Role Description

Great Waters Federal is seeking a highly skilled and experienced Senior Cybersecurity Engineer / Information System Security Engineer (ISSE) to support cybersecurity engineering, security operations, vulnerability management, and continuous monitoring activities within Department of Defense (DoD) information systems. The ideal candidate will possess a minimum of 10 years of relevant experience and demonstrate extensive hands-on technical expertise in:

• Vulnerability assessment and remediation
• Security configuration management
• System hardening
• Endpoint protection
• Enterprise systems administration

This position requires a cybersecurity professional capable of independently identifying, assessing, mitigating, and remediating security vulnerabilities while maintaining compliance with applicable DoD cybersecurity requirements, National Institute of Standards and Technology (NIST) security standards, and organizational security policies. The Senior Cybersecurity Engineer will collaborate with Information System Security Managers (ISSMs), Information System Security Officers (ISSOs), system administrators, network engineers, and other technical stakeholders to maintain the security and operational readiness of mission-critical information systems.

Qualifications

• Minimum of 10 years of relevant professional experience in cybersecurity engineering, information assurance, vulnerability management, or enterprise security operations.
• Demonstrated experience supporting DoD, federal government, or similarly regulated enterprise environments.
• Extensive hands-on experience conducting vulnerability assessments, implementing security controls, and remediating technical security findings.
• Demonstrated experience administering, configuring, and securing enterprise Windows and Linux systems.
• Experience supporting RMF compliance, continuous monitoring, and security authorization activities.
• Strong understanding of enterprise infrastructure, operating system security, endpoint protection, and vulnerability management principles.
• CompTIA Security+ — Current certification required.
• AWS Cloud Certification — Current AWS certification required, such as AWS Certified Solutions Architect, AWS Certified SysOps Administrator, AWS Certified Security – Specialty, or another relevant AWS certification.
• Must meet applicable DoD 8140 qualification requirements for the position’s designated cybersecurity work role and proficiency level.
• Top Secret (TS) security clearance required for full performance of position duties.
• Candidates possessing an active Secret clearance will be considered, provided they are eligible for and willing to undergo the Top Secret clearance investigation and adjudication process.

Requirements

• Implement and maintain technical security controls in accordance with the NIST Risk Management Framework (RMF) and NIST Special Publication 800-53.
• Support Information Security Continuous Monitoring (ISCM) activities in accordance with NIST SP 800-137.
• Provide technical engineering support throughout the RMF authorization lifecycle.
• Assess the effectiveness of implemented security controls and identify technical compliance deficiencies.
• Develop and implement corrective actions to address security control weaknesses.
• Support the development and maintenance of System Security Plans (SSPs), security control implementation statements, assessment evidence, and Plans of Action and Milestones (POA&Ms).
• Evaluate proposed system changes to determine cybersecurity impacts and maintain approved security configuration baselines.
• Provide technical evidence and remediation support for Authority to Operate (ATO) activities.
• Collaborate with ISSOs and ISSMs to ensure continuous compliance with applicable security requirements.
• Install, configure, administer, maintain, and troubleshoot Tenable Nessus vulnerability scanners.
• Conduct authenticated and unauthenticated vulnerability assessments across enterprise information systems.
• Analyze vulnerability findings, assess associated risks, and prioritize remediation efforts based on severity, exploitability, and operational impact.
• Develop and implement vulnerability mitigation and remediation strategies.
• Coordinate with system administrators, engineers, and system owners to resolve identified security weaknesses.
• Perform follow-up vulnerability scans to validate remediation effectiveness.
• Maintain vulnerability tracking records and produce technical reports documenting findings, remediation status, and residual risk.
• Support vulnerability management activities across Windows Server, Red Hat Enterprise Linux, and AWS environments.

Benefits

• Competitive pay, benefits, and perks
• Flexible work-life balance
• Professional development opportunities
• Performance and recognition programs
• Comprehensive benefits package including medical, dental, vision, life, and disability
• Voluntary benefit programs (critical illness, hospital, and accident)
• Health savings and flexible spending accounts
• Retirement 401K plan
• Eligibility for benefits and paid leave programs for full-time employees working at least 30 hours a week

Company Description

Great Waters Federal is part of the Seneca Nation Group (SNG) portfolio of companies. SNG is Seneca Holdings' federal government contracting business that meets mission-critical needs of federal civilian, defense, and intelligence community customers. Our portfolio comprises multiple subsidiaries that participate in the Small Business Administration 8(a) program.

We pride ourselves on our collaborative work environment and culture, which embraces our mission of providing financial and non-financial benefits back to the members of the Seneca Nation.