Senior Linux Administrator

Seneca Resources; Birmingham (AL); Hybrid; USD 90,000 - 120,000; Full time

Job summary

Seneca Resources in Birmingham, AL seeks a Senior Systems Administrator to design, administer, and optimize our infrastructure, including Windows and Linux servers, VMware virtualization, and cloud services.

You will mentor junior staff, manage Microsoft 365 and Active Directory, storage, and DR planning, while guiding architecture improvements and reliability across on-prem and cloud.

Qualifications

• Bachelor's degree in IT/CS or related field.
• 5+ years of enterprise IT/sysadmin experience.
• Expertise in Windows Server and Linux.
• Hands-on VMware vSphere/ESXi and virtualization.
• Experience with Microsoft 365 and Active Directory.
• Proficient in PowerShell and Bash scripting.
• Strong communication and problem-solving skills.

Responsibilities

• Administer, maintain, and optimize enterprise Windows and Linux server environments.
• Manage VMware vSphere/ESXi infrastructure, including configuration, maintenance, performance tuning, and troubleshooting.
• Support enterprise storage, server hardware, virtualization platforms, and core services.
• Create system diagrams, documentation, and procedures.
• Monitor health, performance, availability, and capacity for continuity.
• Administer and support Microsoft 365 services (Exchange Online, Teams, SharePoint, OneDrive).
• Manage Active Directory, GPOs, permissions, and identity controls.
• Assist with cloud-based IaaS/PaaS/SaaS solutions and roadmaps.
• Lead Tier 3 escalation, upgrades, migrations, and deployments.
• Mentor junior admins and collaborate with IT teams on initiatives.

Skills

Windows Server & Linux Admin

VMware vSphere

Microsoft 365 & AD

PowerShell / Bash scripting

Cloud Infrastructure (Azure/AWS)

Storage & Backup

Networking basics

Documentation & Diagrams

Education

Bachelor's degree in IT/CS or related field

Job description

Position Title: Senior Systems Administrator

Location: Birmingham, AL - Hybrid after 90 days

Position Status: Full Time

About the Opportunity

We're seeking an experienced Senior Systems Administrator to join our enterprise IT team and play a critical role in the design, administration, optimization, and support of our infrastructure environment. This position is ideal for a highly skilled systems professional who thrives on solving complex technical challenges, improving system reliability, and driving infrastructure modernization initiatives.

As a senior member of the team, you will support and enhance a diverse technology ecosystem including Windows and Linux servers, VMware virtualization, Microsoft 365, Active Directory, cloud infrastructure, enterprise storage, and network-connected systems. You'll also serve as an escalation point for critical technical issues while mentoring junior team members.

What You'll Do

Infrastructure Administration & Operations

• Administer, maintain, and optimize enterprise Windows and Linux server environments.
• Manage VMware vSphere/ESXi infrastructure, including configuration, maintenance, performance tuning, and troubleshooting.
• Support enterprise storage solutions, server hardware, virtualization platforms, and core infrastructure services.
• Create and maintain system architecture diagrams, infrastructure documentation, and operational procedures.
• Monitor system health, performance, availability, and capacity to ensure business continuity and reliability.

Microsoft & Identity Services

• Administer and support Microsoft 365 services, including Exchange Online, Teams, SharePoint, OneDrive, and related technologies.
• Manage Active Directory, Group Policy, user provisioning, permissions, and identity access controls.
• Implement security best practices for authentication, authorization, and endpoint management.

Architecture, Cloud & Technical Leadership

• Assist with infrastructure design, platform improvements, and technology roadmaps.
• Support cloud-based solutions and services across IaaS, PaaS, and SaaS environments.
• Evaluate system dependencies and application integrations to improve scalability, performance, and reliability.
• Participate in disaster recovery, backup, and business continuity planning efforts.

Advanced Support & Collaboration

• Serve as a Tier 3 escalation resource for complex infrastructure and endpoint issues.
• Lead infrastructure upgrades, migrations, deployments, and system implementations.
• Collaborate with project managers, developers, business stakeholders, and IT teams on strategic initiatives.
• Mentor and guide junior administrators and technical support personnel.

What We're Looking For

Required Qualifications

• Bachelor's degree in Information Technology, Computer Science, Engineering, or a related field, or equivalent combination of education and experience.
• 5+ years of experience in systems administration, infrastructure engineering, or enterprise IT operations.
• Strong experience administering Windows Server and/or Linux operating systems in enterprise environments.
• Hands-on experience with VMware vSphere/ESXi and virtualization technologies.
• Experience supporting Microsoft 365 and Active Directory environments.
• Proficiency with PowerShell, Bash, or other scripting languages used for automation and system administration.
• Experience troubleshooting complex infrastructure, application, and performance-related issues.
• Strong written and verbal communication skills with the ability to explain technical concepts to both technical and non-technical audiences.

Preferred Qualifications

• Experience with cloud platforms such as Microsoft Azure or AWS.
• Knowledge of networking concepts including TCP/IP, DNS, DHCP, routing, switching, firewalls, and network security.
• Experience with SAN/storage technologies, backup solutions, and disaster recovery planning.
• Exposure to infrastructure automation, configuration management, and monitoring tools.
• Project leadership experience and a demonstrated ability to mentor team members.
• Familiarity with enterprise security frameworks, vulnerability remediation, and infrastructure hardening practices.

About Seneca Resources:

At Seneca Resources, we are more than just a staffing and consulting firm, we are a trusted career partner. With offices across the U.S. and clients ranging from Fortune 500 companies to government organizations, we provide opportunities that help professionals grow their careers while making an impact.

When you work with Seneca, you’re choosing a company that invests in your success, celebrates your achievements, and connects you to meaningful work with leading organizations nationwide. We take the time to understand your goals and match you with roles that align with your skills and career path. Our consultants and contractors enjoy competitive pay, comprehensive health, dental, and vision coverage, 401(k) retirement plans, and the support of a dedicated team who will advocate for you every step of the way.