IT- Systems Administrator

Join One of the Fastest-Growing Companies in Government Services!

At ISN Corporation, headquartered in Bethesda, Maryland, we deliver specialized professional services to over 100 Federal government agencies across the country. Our reputation for excellence and results has earned us a spot on the Washington Business Journal’s list of the 50 Fastest Growing Government Contractors, as well as the Inc. 5000 list of Fastest Growing Private Companies—two years running!

We’re not just growing fast—we’re building something great.

Why You’ll Love Working at ISN:
 We believe great work starts with a great workplace. Here’s what we offer to support you:

• Comprehensive medical coverage with prescription benefits
• Dental plan to keep you smiling
• Flexible spending accounts for smarter saving
• Company-paid short- and long-term disability insurance
• Free basic life insurance—because we’ve got your back
• A solid retirement plan to help you plan ahead
• Paid time off starting on Day 1

Who We’re Looking For:
You’re organized, energetic, and ready to make an impact. You thrive in fast-paced environments, love checking things off your to-do list, and can juggle multiple priorities without breaking a sweat. Most importantly, you bring a positive attitude and a problem-solving mindset to everything you do.

If you’re a self-starter with an eye for detail and a passion for excellence, we’d love to meet you.

Mission. Innovation. Impact. Grow with us today!

Overview:

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.

Key Responsibilities:

- 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.

Requirements:

- 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 Skills:

- VMware/Hyper-V experience

- PowerShell scripting

- Experience in compliance environments (NIST 800-171, CMMC)

- Certifications: Security+, Network+, Azure Administrator, CCNA, or similar

Summary:

This role ensures stable IT operations, secure infrastructure, and advanced support across the 

organization. Ideal for a seasoned administrator with broad hands-on experience.

ISN Corporation is proud to be an Equal Opportunity Employer.

We are an Equal Employment Opportunity/Affirmative Action employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, age, national origin, protected veteran status, disability status, marital status, genetic information, or any other characteristic protected by law.

ISN Corporation maintains a Drug-Free Workplace. All candidates must successfully complete a pre-employment background investigation prior to starting employment.