IT Sr. System Administrator

Company: Qualus, LLC
Location: San Francisco
Posted on: June 1, 2025

Job Description:

Position OverviewPower your future with Qualus in our Information Technology department as an IT Sr. Systems Administrator. The IT Sr. System Administrator is a vital member of the Qualus IT infrastructure team and plays an important role in ensuring the stability, security, and efficiency of the organization's computer systems and network infrastructure. This role requires expertise in Windows and Linux system administration, ensuring the seamless operation of enterprise environments.The senior system administrator will be responsible for installing, configuring, and maintaining servers (Windows & Linux), network equipment, and computer systems while also monitoring system performance to identify and resolve technical issues. The role will also require planning and executing software and hardware upgrades to support internal customers.Additionally, the senior system administrator is expected to stay up-to-date with new technologies and industry developments, mentor and train junior administrators, and collaborate with other IT staff, developers, and stakeholders to meet project requirements.A service-oriented mindset, strong customer focus, and the ability to troubleshoot complex systems across both Windows and Linux environments are critical to success in this role. This position requires after-hours work as determined by the needs of the business.Responsibilities

• Manage IT Service Desk requests assigned using an online ticketing system.
• Maintain an understanding of cybersecurity and information protection standards (NIST 800-37, 800-53, 800-171, NERC-CIP, SOC 2, ISO 27001/27002).
• Exercise due diligence in all areas of system activation, security, maintenance, and operability.
• Demonstrate adaptability and flexibility in a fast-growing environment by embracing new technologies, tools, processes, and policies.
• Provide upgrades to system configuration standards, hosted and cloud applications, and be available for overtime as required to meet business needs.
• Identify repetitive patterns of technical issues to uncover root causes and provide solutions to increase security, compliance, efficiency, and effectiveness.
• Deliver world-class customer service, ensuring a high level of user satisfaction.
• Troubleshoot hardware, software, connectivity, security, and mobile device issues.
• Provide support for both Windows and Linux servers in enterprise environments.
• Install, configure, and maintain servers, and computer systems.
• Monitor system performance, diagnose, and resolve Windows and Linux-related issues.
• Create and manage user accounts, permissions, and access control across Windows, Linux, and cloud environments.
• Plan and execute software and hardware upgrades.
• Stay up-to-date with Windows, Linux, and cloud technologies, ensuring adherence to best practices.
• Automate administrative tasks through PowerShell, Bash, or Python scripting.
• Work with configuration management tools (Ansible, Puppet, or Chef) to automate deployments and ensure system compliance.
• Administer virtualized environments (VMware, KVM, or Hyper-V).
• Ensure compliance with security policies by enforcing Linux hardening techniques (CIS benchmarks).
• Collaborate with IT staff, developers, and stakeholders to meet project requirements.
• Document processes, configurations, and troubleshooting steps for knowledge transfer and operational continuity.
• Other duties as assigned.Qualifications
• Bachelor's Degree in related field or equivalent work experience.
• Certifications in Microsoft MCP, MCSE, O365, Network Pro, Security Pro or A+.
• Minimum of 7-10 years' of solid experience working in an IT technical support role.
• Advanced knowledge of Windows Server infrastructure (Active Directory, Group Policy, DNS).
• Strong Active Directory knowledge and experience (Entra ADConnect).
• Experience with VMware.
• Windows 10/11 and Linux system administration and configuration.
• Patch management for Windows Servers and Linux systems (WSUS, SCCM, Satellite, YUM/DNF, APT).
• Scripting proficiency in PowerShell, Bash, or Python.
• Proficiency in Windows and Linux networking (TCP/IP, DNS, DHCP, routing, VLANs).
• Experience with log management and monitoring tools (Syslog, Windows Event Viewer).
• Linux security hardening (CIS benchmarks, SELinux, AppArmor, SSH hardening).
• Experience troubleshooting Linux file systems, disk partitions, and RAID configurations.
• Strong knowledge of secure authentication mechanisms (Kerberos, LDAP, SAML, OAuth).
• Working knowledge of ITIL best practices.
• Architect, configure, implement and support VMware, and Microsoft App-V.
• Solid experience with DNS record management.HIGHLY DESIRED SKILLS:
• Experience with Linux LVM, XFS, EXT4, and ZFS.
• Experience with cloud-based Windows and Linux environments (AWS, Azure).
• Experience with containerization technologies (Docker, Kubernetes).
• Experience with Infrastructure as Code (Terraform, CloudFormation).
• Knowledge of PKI, SSL/TLS certificates, and encryption methods.
• Experience implementing NFS, SMB, CIFS, and iSCSI storage solutions.
• Experience with Linux firewalls (iptables, firewalld, UFW) and Windows Firewall policies.
• Strong understanding of Syslog, and SIEM.
• Leadership skills: Ability to lead and mentor junior staff, as well as work effectively in a team-oriented environment.
• Attention to detail: Strong attention to detail and ability to follow established processes and procedures.
• Organization skills: Ability to keep track of multiple tasks, prioritize responsibilities, and manage time effectively.
• Communication skills: Excellent verbal and written communication skills, including the ability to communicate technical information to non-technical stakeholders.
• Strong working knowledge of IT service management ITIL related services Change management, Configuration management, Asset management, Incident management, Problem management, etc.PREFERRED SKILLS:
• ESXi with vCenter.
• Azure/Entra Administration.
• Configuration Manager (MECM).
• Printer configuration (PaperCut).Company OverviewQualus is a leading pure-play power services firm and innovator at the forefront of the energy transition and transformation, with differentiated capabilities across grid modernization, resiliency, security, and sustainability. The firm partners with utilities, commercial, industrial, data center, and government clients, and renewable and energy storage developers, offering comprehensive solutions through boutique and integrated advisory, planning, engineering, digital solutions, program management, and specialized field services. Qualus also provides software and technology enabled services and develops breakthrough solutions for critical power industry challenges such as distributed and variable resource integration, emergency management, and secure data exchange. The firm has nearly 1,600 professionals, with offices throughout the U.S. and Canada.Qualus benefits offered include Medical, Dental, Vision, Life Insurance, Short and Long-Term Disability, 401(k) match, Flexible Spending Accounts, EAP, Parental Leave, Paid time off, and Holidays, for those who qualify.EEOAt Qualus, we believe everyone has value; and that the diversity and inclusion among our teams is what sets us apart for optimal success. We put people first because we care. To view a copy of the Qualus Equal Opportunity and Affirmative Action Policy Statement, click here.If you are an individual with a disability and require a reasonable accommodation to complete any part of the application process, or are limited in the ability or unable to access or use this online application process, and need an alternative method for applying, please email careers@qualuscorp.com.
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Keywords: Qualus, LLC, Dublin , IT Sr. System Administrator, IT / Software / Systems , San Francisco, California