Senior IT Systems Manager

About the Role

The Senior IT Systems Manager provides leadership and hands‑on support for cybersecurity and enterprise IT systems supporting the National Indian Gaming Commission mission. They oversee secure network operations, manage IT infrastructure and compliance, and deliver on‑demand technical and cybersecurity services to protect systems, data, and continuity of operations at NIGC headquarters in Washington, D.C.

• Perform systems engineering and maintenance following standards.
• Apply NIST and FISMA principles to IT systems management.
• Implement and troubleshoot solutions across LAN, Azure, cloud, and wireless environments.
• Evaluate IT architecture and recommend improvements.
• Identify FISMA compliance gaps and propose remediation plans.
• Manage Microsoft 365 Entra  (conditional access, MFA, auditing).
• Provide operational recommendations to system owners.
• Develop and implement STIG baselines and monitoring/alerting.
• Perform daily systems administration (on‑prem and cloud).
• Execute security compliance tasks (EDR policies, SCUBA baselines).
• Install, configure, and maintain servers, storage, and networking equipment.
• Develop disaster recovery strategies.
• Implement patch management and secure data.
• Apply firmware and security updates.
• Maintain system configurations and mitigate vulnerabilities.
• Support projects and system integrations.
• Develop and maintain systems documentation and SOPs.

• Authorization to permanently work in the United States without sponsorship.
• A Bachelor’s degree and/or relevant certifications (AZ‑800/801, AZ‑104, MS‑102, SC‑300, Security+, Server+, CASP+, CAP, RHCSA, Cisco CCNA or CCNP Enterprise, etc.).
• Minimum 6 years of continuous experience in IT systems engineering or administration.
• Demonstrated experience applying NIST guidelines and FISMA requirements.
• Hands‑on experience with Microsoft 365, Azure, Entra  (identity, MFA, conditional access), and on‑premises and cloud infrastructure (servers, storage, networking).
• Experience in systems engineering, administration, architecture evaluation, patch management, STIG implementation, and vulnerability mitigation.
• Disaster recovery planning and security compliance activities.
• Ability to recommend system improvements and remediation plans and support integration of IT systems and projects.
• Ability to perform with minimal supervision at a senior level.

We offer outstanding benefits including health, financial, and retirement benefits, as well as paid leave, professional development, tuition assistance, and work‑life programs. Our award programs acknowledge employees for exceptional performance and superior demonstration of our service standards. Full‑time and part‑time employees working at least 20 hours a week on a regular basis are eligible to participate in our benefit programs. Other offerings may be provided for employees not within this category.

Terrestris is an Equal Opportunity Employer (EOE). Qualified applicants are considered for employment without regard to age, race, color, religion, sex, national origin, sexual orientation, disability, or veteran status. Applicants must be authorized to work in the U.S.