IT- Systems Administrator

We are seeking a senior-level IT System Administrator with 8-10 years of experience to support and maintain our IT infrastructure. This role manages servers, networks, Microsoft 365, voice systems, and network storage appliances while providing advanced technical support., * Administer Windows servers, Active Directory, DNS, DHCP, and Group Policy.

• Support switches, firewalls, VPNs, and wireless networks.
• Configure and troubleshoot VoIP phones, call routing, and SIP/hosted voice systems.
• Maintain NAS/SAN storage appliances and shared drive environments.
• Manage Microsoft 365, Azure AD/Entra ID, Teams, and SharePoint.
• Provide Tier 3 support and handle complex technical escalations.
• Monitor backups, system performance, security patches, and updates.
• Maintain documentation, SOPs, and asset inventory., This role ensures stable IT operations, secure infrastructure, and advanced support across the organization. Ideal for a seasoned administrator with broad hands-on experience.

• 8-10 years of experience in system/network administration.
• Strong expertise in Windows Server, Microsoft 365, and core networking.
• Hands-on experience with VoIP systems and network storage appliances.
• Strong understanding of security best practices and patch management.
• Ability to work independently and manage multiple priorities.

Preferred Qualifications

• VMware/Hyper-V experience
• PowerShell scripting
• Experience in compliance environments (NIST 800-171, CMMC)
• Certifications: Security+, Network+, Azure Administrator, CCNA, or similar

Pulled from the full job description

• 401(k)
• Health insurance
• Paid time off
• Dental insurance
• Flexible spending account
• Life insurance
• Disability insurance, We believe great employees deserve great support. Our comprehensive benefits package includes:
• Comprehensive Medical Coverage with Prescription Benefits
• Dental Insurance
• Flexible Spending Accounts (FSA)
• Company-Paid Short-Term & Long-Term Disability
• Company-Paid Basic Life Insurance
• 401(k) Retirement Plan
• Paid Time Off beginning on your first day of employment
• Professional growth and leadership development opportunities

At ISN, we believe our people are the driving force behind our success. For more than 45 years, we’ve partnered with over 150 federal agencies to deliver innovative, mission-critical solutions that strengthen government mission and serve the public.

Recognized over 25 times by the Washington Business Journal as one of the 50 Fastest Growing Government Contractors and by the Inc. 5000 as one of the Fastest Growing Private Companies, ISN continues to grow through exceptional service, innovation, and a commitment to excellence. We have earned more than 100 commendation letters from our customers recognizing our commitment to exceptional quality, timely delivery, and unwavering integrity. We take pride in our role as a trusted government partner, delivering innovative solutions that benefit society, strengthen national security, and support mission-critical operations.

At ISN, you’ll find more than a job-you’ll find an opportunity to build your career, collaborate with talented professionals, and make a meaningful impact supporting important federal missions. We foster a collaborative, inclusive culture where employees are encouraged to learn, grow, share ideas, and contribute to innovative solutions for our customers.

Whether you’re just beginning your career or bringing years of experience, you’ll join a team that values integrity, accountability, teamwork, and continuous improvement. If you’re passionate about making a difference and delivering exceptional results, we’d love to have you on our team.