Systems Administrator

Description

Position Summary

• The Senior Systems Administrator is a hands-on infrastructure professional responsible for supporting the
• stability, security, and continuous improvement of Chris-Leef’s IT infrastructure and end-user technology
• environment. This role is expected to take ownership of day-to-day systems administration, infrastructure
• projects, escalated support, vendor coordination, documentation, and operational follow-through.
• The ideal candidate is experienced, self-directed, highly accountable, and comfortable supporting a small-tomid-
• sized business environment where strong communication, urgency, and practical problem solving are
• essential. This position works closely with the Manager of IT and business leadership to keep systems secure,
• reliable, and aligned with company needs.
• This is a strong opportunity for an experienced Systems Administrator who is ready to take on broader ownership,
• lead meaningful projects, and grow into a larger operational leadership role over time.

Essential Duties and Responsibilities

•  Administer and maintain core IT infrastructure including Microsoft 365, Azure/Entra services, Windows
• Server, Active Directory, Group Policy, DNS, DHCP, file services, and related business systems.
•  Own day-to-day infrastructure operations, including monitoring, patching, troubleshooting, change planning,
• documentation, and proactive issue resolution.
•  Provide leadership for escalated help desk and end-user support issues while coaching and assisting other IT
• team members as needed.
•  Manage endpoint administration and remote monitoring tools, including device deployment, software
• installation, security configuration, inventory, and lifecycle support.
•  Maintain and improve identity, access, and security controls across users, devices, applications, network
• resources, and cloud services.
•  Support and manage network infrastructure including firewalls, switches, wireless access points, VPN,
• VLANs, routing, and network monitoring.
•  Manage backup, disaster recovery, and business continuity processes, including routine validation,
• documentation, and recovery testing where appropriate.
•  Support cybersecurity tools and processes including endpoint security, email security, MFA, vulnerability
• remediation, security alerts, and incident response coordination.
•  Perform root-cause analysis using logs, monitoring tools, vendor resources, and structured troubleshooting
• methods.
•  Assist with technical planning, architecture, and implementation of infrastructure improvements, migrations,
• upgrades, and security initiatives.
•  Coordinate with vendors, service providers, and support partners to resolve issues and maintain effective
• service delivery.
•  Maintain accurate technical documentation, procedures, diagrams, asset information, and administrative
• records.
•  Support compliance, audit, and security review activities by gathering evidence, improving controls, and
• remediating identified gaps.
• Senior Systems Administrator Job Description | Chris-Leef General Agency
•  Be available for occasional off-hours maintenance, emergency support, or project work when business needs
• require it.

Qualifications

Knowledge and Skills

•  Strong ownership mindset with the ability to independently drive issues and projects to completion.
•  Excellent customer service skills with the ability to communicate technical concepts clearly to non-technical
• users and leadership.
•  Strong troubleshooting and analytical skills, including log review, root-cause analysis, and disciplined
• problem resolution.
•  Ability to balance urgent support needs with planned project work, documentation, and long-term
• infrastructure improvement.
•  Professional judgment, confidentiality, and discretion when handling sensitive company, employee, and
• system information.
•  Strong written communication, documentation, time management, and organizational skills.
•  Comfortable working in a fast-paced environment with changing priorities and limited ambiguity.
•  Collaborative team player who can also operate with self-sufficiency, urgency, and tenacity.
•  Ability to accept feedback, communicate status clearly, and build trust with users, peers, vendors, and
• leadership.
•  Practical understanding of security best practices, least privilege access, MFA, patching, backup validation,
• and change control.

Required Education and Experience

•  Bachelor’s degree in Information Technology, Computer Science, Network Engineering, or related field
• preferred; equivalent professional experience will be considered.
•  4+ years of progressive systems administration, infrastructure support, or equivalent hands-on IT operations
• experience in a business environment.
•  Experience administering Microsoft 365 and Microsoft cloud services, including Exchange Online, Teams,
• SharePoint/OneDrive, Azure/Entra ID, users, groups, licensing, and security settings.
•  Experience with Windows Server, Active Directory, Group Policy, DNS, DHCP, file permissions, and core
• Microsoft infrastructure services.
•  Experience with virtualization platforms such as Hyper-V or VMware.
•  Experience administering firewalls, switches, wireless networks, VPN connectivity, and general network
• troubleshooting.
•  Experience supporting endpoint management, patching, remote monitoring, endpoint security, and user
• device lifecycle processes.
•  Experience with backup administration, disaster recovery concepts, and business continuity support.
•  Ability to participate in occasional off-hours support or maintenance windows when required.

Preferred Qualifications

•  Experience with tools and platforms such as NinjaOne, SentinelOne, Proofpoint, Duo, SonicWall, UniFi,
• Veeam, Dropsuite, or similar systems.
•  Working knowledge of Linux administration and SQL/database concepts.
•  Experience in a regulated business environment or with audit/compliance support, cyber insurance
• questionnaires, PCI/security reviews, or similar requirements.
• Senior Systems Administrator Job Description | Chris-Leef General Agency
•  Experience creating IT documentation, standard operating procedures, network diagrams, support
• playbooks, and administrative runbooks.
•  Experience coordinating with MSPs, software vendors, telecom providers, security partners, or infrastructure
• support vendors.
•  Relevant certifications such as Microsoft, CompTIA, Cisco, VMware, or security-focused certifications are a
• plus.