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Senior System Administrator – Windows Server & Active Directory
Job Location:
Job Location:
Syracuse, NY - USA
Monthly Salary:
$ 120000 - 140000
Monthly Salary:
Posted:
10 June 2026 (30+ days ago)
Posted:
Application Deadline:
14 September 2026
Application Deadline:
Vacancies:
1 Vacancy
Vacancies:
Job Summary
JMA is restoring U.S. leadership in wireless technology at a critical time in the transition to 5G. It makes the worlds most advanced software-based 5G platform designed coded and manufactured in Syracuse NY at the only U.S.-owned 5G factory in the country.
Across its global tech centers JMA makes 5G possible for organizations with the most critical connectivity demands in the world. JMAs technology is ushering in a new era of connectivity for leading mobile carriers the most iconic stadiums major universities leading healthcare centers the busiest transit centers and the U.S. Military.
5G is more than another G on your phone it is a generational opportunity to change the way the world operates. Join the industrys fastest growing technology company to shape that future today.
We are seeking an experienced Senior Systems Administrator to manage and maintain our core enterprise infrastructure.
The Senior System Administrator is the organizations technical lead for Windows Server and Active Directory infrastructure with strong supporting ownership of Microsoft 365 (Office 365) and VMware virtualization. This is a senior individual-contributor role that combines deep hands-on administration with architecture standards-setting and mentorship. The Senior System Administrator designs and operates a secure resilient and well-governed environment leading complex projects and migrations defining operational best practices and serving as the highest level of escalation for infrastructure and identity. The ideal candidate is a seasoned security-minded engineer who can both go deep technically and raise the capability of the wider team.
Position Responsibilities:
Active Directory & Windows Server (Primary Focus)
- Own the architecture health and roadmap of Active Directory domains forests trusts sites OUs and replication.
- Define and govern Group Policy strategy and standards for security configuration and standardization across the estate.
- Lead design and administration of core Windows Server roles and services including DNS DHCP file/print and PKI (AD CS).
- Set build patching and hardening standards for Windows Server; own server lifecycle and capacity planning.
- Establish identity and access-governance practices for user group and service accounts (least privilege tiering).
- Maintain and troubleshoot domain controllers FSMO roles replication and authentication (Kerberos/NTLM) at an expert level.
- Design and validate backup restore and disaster recovery strategy for Active Directory and server workloads.
Identity Security & Hybrid Connectivity
- Own hybrid identity strategy and synchronization between on-premises Active Directory and Microsoft Entra ID (Entra Connect).
- Define and enforce strong authentication standards including multi-factor authentication (MFA) and conditional access.
- Establish and maintain server and endpoint security baselines patching cadence and hardening standards.
- Lead support for audits access reviews logging and compliance requirements (e.g. SOC 2 ISO 27001 HIPAA as applicable).
- Drive detection of and response to identity- and infrastructure-related security events; lead root-cause analysis.
Microsoft 365 / Office 365 Administration
- Provide senior-level administration of the Microsoft 365 tenant including Exchange Online SharePoint Online OneDrive and Microsoft Teams.
- Govern licensing tenant configuration and administrative role assignments.
- Design and maintain Microsoft 365 security and compliance controls (DLP retention email protection / Defender for Office 365).
- Lead tenant migrations and the adoption of new Microsoft 365 services; resolve complex mail flow and service issues.
Virtualization & VMware
- Own administration and design of VMware vSphere/ESXi and vCenter including HA DRS and resource strategy.
- Lead VM provisioning standards host upgrades patching and capacity planning for performance and availability.
- Manage storage and networking within the virtual environment (datastores vSwitches VLANs vMotion).
- Lead troubleshooting and remediation of performance and availability issues across the virtualization stack.
Leadership Projects & Collaboration
- Serve as the highest level of escalation for complex infrastructure identity and platform issues.
- Mentor and provide technical leadership to junior administrators and help desk staff; review work and share knowledge.
- Lead infrastructure projects migrations and upgrades from planning through implementation and handover.
- Define automation strategy and build tooling using PowerShell (and Microsoft Graph) to improve reliability and efficiency.
- Author and maintain architecture documentation runbooks standards and configuration records.
- Partner with security networking and application teams; contribute to the infrastructure roadmap and technology decisions.
- Participate in and lead an on-call rotation for critical systems as required.
Required Skills & Experience:
- 6 years of system administration experience including senior-level hands-on Active Directory and Windows Server administration in production.
- Expert working knowledge of Group Policy DNS DHCP PKI and core Windows Server roles and services.
- Proven experience designing and governing identity access and least-privilege controls in a Windows-centric environment.
- Strong hands-on experience administering Microsoft 365 / Office 365 (Exchange Online Teams SharePoint security).
- Strong hands-on experience administering VMware vSphere/ESXi and vCenter.
- Experience leading projects migrations and disaster recovery planning for core infrastructure.
- Demonstrated ability to mentor others and set technical standards and best practices.
- Excellent troubleshooting communication and stakeholder-management skills with a security-focused mindset.
- This role is based in Syracuse NY and will require onsite presence.
Preferred Skills & Experience:
- Bachelors degree in Information Technology Computer Science or a related field (or equivalent experience).
- Senior-level certifications such as Microsoft Certified: Windows Server Hybrid Administrator Associate Identity and Access Administrator Associate (SC-300) or Microsoft 365 Administrator Expert.
- Additional certifications such as VMware VCP-DCV or Azure Solutions Architect / Administrator (AZ-104).
- Advanced scripting and automation with PowerShell and Microsoft Graph; familiarity with infrastructure-as-code.
- Experience with hybrid identity (Entra Connect) Intune / endpoint management Zero Trust and security/compliance frameworks.
- Solid networking fundamentals (VLANs firewalls VPN load balancing).
$120000 - $140000 a year
The US national annual base salary range for this is $120000 - $140000. The range includes base salary that is expected to be paid for this role. Actual base salary will be based on a variety of factors including but not limited to the scope and complexity of the role the successful candidates relevant experience skills and knowledge peer and market data and geographic location.
At JMA our people are deeply committed to their work and we provide benefits to match. When you join JMA you have immediate access to everything you need. Whether youre looking for employee discounts financial legal and/or childcare resources and support we have you covered. We believe in providing comprehensive health and wellness coverage along with monetary rewards towards health goals in addition to numerous company-provided personal protection benefits at no additional cost to you.
At JMA we dont just accept differences we embrace them. JMA is proud to be an equal opportunity workplace. We do not discriminate based upon race religion color national origin gender (including pregnancy childbirth or related medical conditions) sexual orientation gender identity gender expression age status as a protected veteran status as an individual with a disability or other applicable legally protected characteristic.
We may use artificial intelligence (AI) tools to support parts of the hiring process such as reviewing applications analyzing resumes or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed please contact us.
Required Experience:
Director
About Company
Wireless technology now impacts nearly every aspect of daily life around the world. As the fastest-growing global tech company, JMA designs and delivers cutting-edge wireless technology solutions that modernize how people learn, work, live and play, like never imagined. We power today ... View more
