IT- Systems Administrator

Job Description

Job Description

Join a Company Where Your Work Makes a Difference

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.

Why You'll Love Working at ISN

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

 

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.

- 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

 

Position 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 celebrate diversity and are committed to creating an inclusive workplace where all qualified applicants receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, disability, protected veteran status, genetic information, or any other status protected by applicable law.

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