Sr. Systems Administrator

Ohmstede Ltd is looking for a Senior Infrastructure & Systems Administrator to serve as the senior technical owner for Ohmstede’s infrastructure environment, including servers, virtualization, hyperconverged infrastructure, networking, endpoint management, backups, disaster recovery, and core technology operations. This role is responsible for maintaining secure, reliable, and scalable technology services across company locations while supporting business operations, compliance requirements, and operational continuity.

This position is a hands-on infrastructure and systems administration role that provides advanced technical support, manages infrastructure projects, coordinates vendors, supports cybersecurity and vulnerability remediation efforts, and maintains documented standards, runbooks, and recovery procedures. The role also serves as a senior escalation resource for complex infrastructure, network, security, and systems issues.

Essential Duties & Responsibilities:

Infrastructure Administration

• Administer and maintain physical and virtual server environments.
• Manage VMware ESXi, vSphere, and Dell VxRail infrastructure across all locations.
• Perform server installation, configuration, patching, upgrades, and lifecycle management.
• Administer Windows Server, Active Directory, Group Policy, DNS, DHCP, and related core services.
• Support SQL Server maintenance, availability, and operational health.
• Monitor infrastructure performance, capacity, utilization, and availability.
• Manage infrastructure modernization and hardware refresh initiatives.

Backup, Disaster Recovery & Business Continuity

• Administer and support Cohesity backup and recovery platforms.
• Monitor backup operations, resolve backup failures, and report backup health.
• Perform regular restore testing, recovery validation, and disaster recovery readiness activities.
• Maintain documented backup, restore, disaster recovery, and business continuity procedures.
• Identify backup, storage, virtualization, and infrastructure risks and recommend improvements.

Network & Connectivity Services

• Administer wired, wireless, LAN, WAN, and SD-WAN infrastructure across all sites.
• Manage Meraki switches, firewalls, wireless access points, VLANs, and network connectivity.
• Support VMware VeloCloud SD-WAN environments and site-to-site connectivity.
• Troubleshoot network performance, latency, routing, and connectivity issues.
• Coordinate network installations, data drops, cabling projects, telecommunications vendors, and service providers.
• Maintain network standards, diagrams, documentation, and best practices.

Cybersecurity & Compliance

• Serve as a primary technical owner for infrastructure and endpoint security controls.
• Monitor, prioritize, and remediate vulnerabilities, CVEs, and security findings.
• Administer and review security platforms such as endpoint protection, Cortex, Forescout, Intune, and related tools.
• Support EMCOR security standards, corporate policy requirements, audits, and compliance initiatives.
• Participate in incident response, risk remediation, access control, and security improvement activities.
• Support software licensing compliance and technology asset accountability.

Endpoint, Asset & Device Management

• Administer Microsoft Intune and endpoint management solutions.
• Manage workstation compliance, software deployment, device configuration, and endpoint lifecycle standards.
• Maintain accurate inventory of computers, tablets, servers, printers, network equipment, and related technology assets.
• Support hardware refresh planning, equipment replacement, and technology lifecycle management.
• Support copier configuration, address book management, mobile device administration backup, and physical security technology such as camera systems as assigned.

Technical Leadership, Support & Vendor Management

• Serve as a Level 2 and Level 3 escalation point for complex infrastructure, systems, network, endpoint, and security issues.
• Assist with Level 1 support activities during staffing shortages or business-critical events.
• Research and resolve technical issues affecting business operations.
• Develop technical requirements, obtain quotes, and coordinate infrastructure-related purchasing and ordering.
• Manage relationships with infrastructure vendors, hardware manufacturers, telecommunications providers, and support partners.
• Support change management processes, planned maintenance, software upgrades, and infrastructure project execution.

Documentation & Operational Excellence

• Create and maintain infrastructure runbooks, network diagrams, configuration standards, support procedures, and recovery documentation.
• Document backup and restore processes, VMware/VxRail environments, network responsibilities, endpoint management procedures, and security tool ownership.
• Maintain ownership documentation for infrastructure systems, including primary owner, backup owner, documentation status, risk level, and vendor support availability.
• Cross-train IT team members to reduce single-person dependency and improve backup coverage.
• Identify operational gaps, infrastructure risks, and training needs, and recommend improvements to IT leadership.

Key Areas of Ownership

Infrastructure

Security & Compliance

Windows Server

VMware ESXi/vSphere

Dell VxRail

SQL Server

Storage & Capacity

LAN/WAN/Wireless

Meraki

VeloCloud SD-WAN

Endpoint Security

Cortex Review

Forescout

Intune Compliance

Vulnerability/CVE Remediation

EMCOR Policy Support

Software License Compliance

Security Camera Systems

Backups & Restores

Disaster Recovery Testing

Hardware Refresh

Asset Inventory

Infrastructure Quotes

Vendor Coordination

Runbooks & Documentation

Tier 2/Tier 3 Escalation

Qualifications:

Required

• 5+ years of progressively responsible systems administration, infrastructure administration, or equivalent enterprise IT experience.
• Strong experience with Microsoft Windows Server, Active Directory, Group Policy, DNS, DHCP, and related infrastructure technologies.
• Experience administering VMware virtualization environments; experience with VxRail or hyperconverged infrastructure strongly preferred.
• Strong networking knowledge including TCP/IP, switching, wireless networking, VLANs, VPNs, firewalls, WAN, and SD-WAN concepts.
• Experience with enterprise backup and recovery platforms, restore testing, and disaster recovery documentation.
• Experience with Microsoft 365, Azure/Entra ID, Intune, endpoint management, and device compliance.
• Strong troubleshooting, documentation, project execution, and vendor coordination skills.
• Ability to manage multiple priorities, work independently, and communicate effectively with technical and non-technical stakeholders.

Preferred

• VMware, Microsoft, Meraki, cybersecurity, or infrastructure-related certifications.
• Experience with Dell VxRail, Cohesity, Meraki, VMware VeloCloud, Cortex, Forescout, and Microsoft Intune.
• Experience supporting manufacturing, industrial, or multi-site business environments.
• Experience supporting cybersecurity, vulnerability management, security remediation, and compliance programs.
• Experience with SQL Server administration, storage health, and infrastructure capacity planning.

We are one of the nation’s leading providers of industrial solutions, serving as the single-source for our client’s custom shell and tube heat transfer equipment. Our fully integrated shop services include state-of-the-art technologies, engineering, design, manufacturing, fabrication, maintenance, and repair., As a leading provider of mechanical and electrical construction, facilities services, and energy infrastructure, we offer employees a competitive salary and benefits package and we are always looking for individuals with the talent and skills required to contribute to our continued growth and success. Equal Opportunity Employer/Veterans/Disabled Affirmative Action Policy:

Please review our Affirmative Action Policy Notice to Prospective Employees: Notice to prospective employees: There have been fraudulent postings and emails regarding job openings. EMCOR Group and its companies list open positions here. Please check our available positions to confirm that a post or email is genuine. EMCOR Group and its companies do not reach out to individuals to help with marketing or other similar services. If an individual is contacted for services outside of EMCOR’s normal application process - it is probably