Senior Cybersecurity Engineer / Information System Security Engineer (ISSE)

Great Waters Federal is part of the Seneca Nation Group (SNG) portfolio of companies. SNGis 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. To learn more about SNG, visitthe website and follow us onLinkedIn.Our team of talented individuals is what makes us successful. To support our team, we provide a balanced mix of benefits and programs.Your total rewards package includes competitive pay, benefits, and perks, flexible work-life balance, professional development opportunities, and performance and recognition programs. We offer a comprehensive benefits package that includes medical, dental, vision, life, and disability, voluntary benefit programs (critical illness, hospital, and accident), health savings and flexible spending accounts, and retirement 401K plan. One of our fundamental principles is to offer competitive health and welfare benefits to our team members, providing coverage and care for you and your family. Full-time employees working at least 30 hours a week on a regular basis are eligible to participate in our benefits and paid leave programs. 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.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 Departent 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, and 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.Roles and Responsibilities include, but are not limited to:Cybersecurity Engineering and Risk Management Framework (RMF) * 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. Vulnerability Assessment, Management, and Remediation * I