IT MANAGER/SENIOR SYSTEMS ADMINISTRATOR

Posted Yesterday
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NYC, NY, USA
In-Office
Senior level
Information Technology • Consulting
The Role
Leads enterprise IT infrastructure administration across identity, Windows and file servers, Microsoft 365, virtualization, networking, security, telephony, facilities systems, and automation. Oversees access governance, controls, audits, licensing, vendors, projects, eDiscovery, backup and disaster recovery, and change management. Serves as technical escalation point, mentors junior staff, coordinates infrastructure and security initiatives, and supports onsite server rooms and critical environments.
Summary Generated by Built In

Role: IT MANAGER/SENIOR SYSTEMS ADMINISTRATOR

Location: New York City, NY or Old Greenwich, CT (5 Days a Week Onsite)

Duration: Fulltime

 

Core responsibilities

·        Identity and access governance: Lead the administration of Active Directory architecture, group design, and the service-account estate: service principal names, Entra ID application registrations, Graph API access, and credential rotation through our password vault. Maintain existing access standards, run periodic access and service-account reviews, and evaluate and process access exceptions in accordance with established approval procedures.

·        File and storage services: administer the Windows and Samba file-server estate across headquarters, the offsite datacenter, and remote offices; manage capacity, quotas, and monitoring; plan and execute server and share migrations; oversee archiving, backup, and data-governance tooling.

·        Email and collaboration platforms: administer Microsoft 365 and Exchange Online, including mail routing, mail security and filtering, DLP, retention and journaling, and the Teams, SharePoint, and OneDrive estate.

·        Server and virtualization infrastructure: build, patch, and maintain the Windows Server estate on VMware vSphere; hands-on work with physical server hardware including racking, cabling, diagnostics, and component replacement.

·        Network and perimeter: Administer and troubleshoot TCP/IP, DNS, DHCP, VLANs, wireless networks, certificates, and infrastructure-monitoring platforms. Configure, monitor, and manage firewalls to enforce access controls and protect the corporate network against unauthorized access and cyber threats. Manage telecom and ISP vendor relationships.

·        Security operations: administer endpoint protection, data-governance, and email-security platforms; manage multi-factor authentication, conditional access, and geographic access restrictions; run the security-awareness and phishing-simulation program; respond to alerts and vulnerabilities.

·        eDiscovery and legal hold: perform mailbox and file searches in support of subpoenas, regulatory requests, and litigation; preserve, collect, and produce data under the direction of counsel and Compliance, handling all of it with strict confidentiality.

·        Telephony and voice services: support the current Avaya PBX, associated analog lines, and voice-service vendors; troubleshoot and coordinate resolution of telephony incidents, provisioning, and office moves. Assist with the planned transition of PBX operations to an outsourced provider and oversee the vendor relationship thereafter.

·        Automation: use PowerShell and Python to automate provisioning, reporting, and task scheduling, and maintain our enterprise job scheduling platform.

·        License, subscription, and vendor governance: Oversee software and cloud-service entitlements, licensing, renewals, procurement, and vendor relationships. Review user licensing and assignments across platforms such as Adobe, Box, Microsoft 365/Intune, Visual Studio, Verizon, Bloomberg, and similar services. Recommend and implement subscription changes that appropriately align user access, device-management, security, operational needs, and vendor-licensing requirements.

·        Project and vendor coordination: Own the technical delivery of internal and vendor-led infrastructure and security projects from requirements gathering, scoping, resource planning, testing, and implementation through acceptance and documentation. Define and maintain project plans, timelines, dependencies, risks, action items, and internal and vendor resource needs; track progress, escalate issues, and coordinate stakeholders through completion.

·        Change management and IT control reviews: Maintain accurate records of material infrastructure, configuration, and access changes across on-premises systems, AWS, and managed-service-provider environments. Perform monthly reviews of Active Directory group membership, workstation configuration, local administrator access, server assignments, and system usage and monitoring; investigate and remediate discrepancies; and document findings, approvals, exceptions, and follow-up actions.

·        IT security oversight and policy compliance: Maintain operational controls that support IT policies, client and regulatory due-diligence questionnaires (DDQs), and external security representations. Ensure documented policies, DDQ responses, and day-to-day practices remain aligned. Monitor and validate controls for password and credential rotation, service accounts, least-privilege access, patching and reboot compliance, and the documentation, approval, and periodic review of exceptions.

·        Technical leadership and escalation: Route and prioritize support tickets, help coordinate support coverage and issue resolution, and serve as the technical escalation point for IT support staff. Mentor junior team members and promote clear documentation, consistent operational practices, and timely risk escalation.

·        Facilities and critical-environment infrastructure: monitor and coordinate the power, cooling, and environmental systems supporting office technology rooms and server rooms, including UPS units, PDUs, circuits, temperature/humidity monitoring, and HVAC. Coordinate with building management, datacenter providers, electricians, and HVAC vendors during incidents, maintenance, capacity changes, and planned shutdowns.

 
Skills and qualifications

  • In-depth knowledge of Microsoft Windows Server, Active Directory, Microsoft 365, MS Teams, and Multi-Factor Authentication.
  • Hands-on experience administering non-human identity: service accounts, service principal names, Entra ID app registrations, and credential lifecycle management.
  • Experience with VMware vSphere virtualization.
  • Strong experience administering Windows file servers and network storage at scale - permissions, quotas, capacity monitoring, and migrations.
  • Strong understanding of email flow and mail security, including routing, spam, malware, and DLP; hands-on experience with a secure email gateway (Proofpoint, Mimecast, or similar).
  • Strong understanding of networking concepts and protocols (TCP/IP, DNS, DHCP, VLANs, etc.), coupled with experience in configuring, monitoring, and managing firewalls to secure the corporate network, and enforce access controls.
  • Experience with endpoint protection and data-governance platforms (CrowdStrike, Varonis, or similar).
  • Proficiency with PowerShell for infrastructure automation, reporting, and administration.
  • Hands-on experience with physical server hardware, including racking, structured cabling, hardware diagnostics, and component replacement (disks, memory, power supplies, etc.).
  • Working knowledge of the power and environmental requirements of server rooms and network closets, including UPS systems, rack PDUs, electrical capacity, cooling, temperature/humidity monitoring, and escalation to facilities, datacenter, and building vendors.
  • Proven experience as a Systems Administrator or similar role, with 7+ years managing enterprise IT infrastructure in a hands-on environment.
  • Experience supporting DR, backup/restore testing, infrastructure monitoring, change control, and documented operational procedures.
  • Experience operating and evidencing IT controls in a regulated or audited environment, including access reviews, change management, exception management, and policy compliance.
  • Demonstrated experience with software and cloud-license governance, entitlement reviews, vendor renewals, and cost-conscious subscription management.
  • Proven ability to lead technical projects and coordinate internal stakeholders, managed service providers, and other vendors from scope through implementation.
  • Strong organizational skills, with the judgment to identify control gaps, document risks, drive remediation, and communicate status clearly to technical and non-technical stakeholders.

 Preferred qualifications

  • Bachelor's degree in Computer Science, Information Technology, or related field (or equivalent experience).
  • Experience in financial services or another regulated, audited environment.
  • Exposure to eDiscovery, legal hold, or regulatory production processes.
  • Experience with cloud computing platforms such as AWS or Azure is a plus.
  • Experience with configuration management tooling (Ansible, PowerShell DSC, or similar) is beneficial.
  • Familiarity with market data platforms, particularly Bloomberg administration and entitlements.
  • Familiarity with Avaya PBX administration, analog/POTS lines, and telecom vendor coordination.

 What we’re looking for

  • Excellent problem-solving skills and attention to detail.
  • Strong communication and interpersonal skills, including the ability to explain technical issues to non-technical stakeholders.
  • Discretion and sound judgment when handling confidential company, employee, and legal data.
  • A practical, service-oriented approach; able to balance competing priorities, document work clearly, and escalate risks appropriately.
  • Comfortable serving as a technical escalation point and mentoring junior IT staff.

 Working arrangements

  • On-site only — this is not a remote or hybrid role.
  • Occasional scheduled after-hours work for patching windows and recovery testing.
  • Ability to move and install IT equipment and work in server rooms, wiring closets, and office locations as needed.
  • If located in NYC, must have ability to travel to CT or our DR site in Westchester as needed.


Skills Required

  • 7+ years managing enterprise IT infrastructure in a hands-on Systems Administrator or similar role
  • In-depth knowledge of Microsoft Windows Server, Active Directory, Microsoft 365, Microsoft Teams, and MFA
  • Hands-on administration of service accounts, service principal names, Entra ID application registrations, and credential lifecycle management
  • Experience with VMware vSphere virtualization
  • Experience administering Windows file servers and network storage, including permissions, quotas, capacity monitoring, and migrations
  • Experience with email flow, routing, spam and malware protection, DLP, and secure email gateways such as Proofpoint or Mimecast
  • Strong knowledge of TCP/IP, DNS, DHCP, VLANs, networking, and firewall administration
  • Experience with endpoint protection and data-governance platforms such as CrowdStrike or Varonis
  • Proficiency with PowerShell for infrastructure automation, reporting, and administration
  • Hands-on experience with physical server hardware, racking, cabling, diagnostics, and component replacement
  • Working knowledge of server-room power, cooling, UPS, rack PDUs, electrical capacity, and environmental monitoring
  • Experience supporting disaster recovery, backup and restore testing, infrastructure monitoring, change control, and documented procedures
  • Experience operating and evidencing IT controls in a regulated or audited environment
  • Experience with software and cloud-license governance, entitlement reviews, renewals, and vendor management
  • Experience leading technical projects and coordinating internal stakeholders, managed service providers, and vendors
  • Bachelor's degree in Computer Science, Information Technology, or a related field, or equivalent experience
  • Experience in financial services or another regulated, audited environment
  • Exposure to eDiscovery, legal hold, or regulatory production processes
  • Experience with AWS or Azure
  • Experience with Ansible, PowerShell DSC, or similar configuration-management tooling
  • Familiarity with Bloomberg administration and entitlements
  • Familiarity with Avaya PBX, analog/POTS lines, and telecom vendor coordination
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The Company
HQ: Naperville, IL
433 Employees
Year Founded: 2004

What We Do

Established in 2004, 3Core System is a certified small minority owned business providing ERP Systems Integration, AMS, IT Consulting and Staff Augmentation Services to Fortune 1000, SMB, and State, Local and Education (SLED) customers. While our System Integration services help organizations achieve digital and cloud transformation objectives, AMS Services help increase the availability of critical services of end user applications. On the other hand, our IT Consulting Services would provide subject matter experts to help you assist with specific project needs and the Staff Augmentation services help you balance workload and achieve budget parameters. >ERP System Integration Services: 3Core Systems is an SAP Silver Partner and authorized service provider offering technical architecture, application design and configuration, integration, testing, data migration and solution adoption services for solutions including SAP SuccessFactors, SAP HCM On-Premises and SAP Business Intelligence >Application Management Services (AMS): We offer post go-live, System Health Check and Optimization, Function Enhancements, Integration Monitoring, Release, and patch services. Our AMS services span across SAP Solutions including ERP (S/4 HANA), Financial Management, Human Capital Management, Data and Analytics, Supply Chain, CRM, and Customer Experince. >IT Consulting and Staffing Augmentation Services: Ever since its inception, 3Core Systems has been offering IT Consulting and Staff Augmentation solutions including temporary, long-term, project based and contract staffing services that could be personalized based on your needs. Our staffing services span across emerging technologies and legacy solutions including but not limited to Artificial Intelligence, Machine Learning, Data Science, Cloud, ERP, CRM, BI/BW/ETL, Database, Web & E-Commerce, UI/UX, Network & Security and Mobile.

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