Senior Systems Administrator

TrellisWare Technologies•San Diego, CA

8h•$110,000 - $150,000

About The Position

TrellisWare launched in 2000 with an innovative culture striving to push technological boundaries in the area of wireless communications. We are now a worldwide leader in highly advanced algorithms, waveforms, and communications systems that range from small form factor radio products to fully integrated solutions. At TrellisWare, we connect passion with purpose and together we make an impact- on our careers, our company, and the world. And you can too. If you love to innovate and collaborate in a dynamic environment where boundaries are being pushed, you belong at TrellisWare. Where the opportunity to serve is not a challenge but a gift. Where you’re never going alone. Because there’s too much at stake to go solo. Our people are our primary asset, and we believe that strong, cohesive teams are the key to leveraging brilliant individual contributions to even greater achievements. Our Information Technology Team is seeking a Senior Systems Administrator. This role focuses on the design, maintenance, and optimization of enterprise infrastructure, ensuring systems are resilient, performant, and secure. Enhancing cohesiveness and maintaining team morale is a responsibility of all our team members, as is the ambition for self-improvement and talent development. Through this dedication to unity and professional advancement, each team member is directly impacting the successful outcome of TrellisWare’s deliverables and setting the tone for our core values of delivering excellence, pushing boundaries, and empowering people.

Requirements

CompTIA Security Plus certification or the ability to obtain within six months of start date.
Five or more years of hands-on experience managing complex enterprise environments, including maintaining system health and compliance in regulated settings.
Bachelor’s degree preferred but equivalent experience may be substituted.
Must be able to obtain and maintain an active Secret Clearance which requires U.S. Citizenship.
Strong analytical skills with the ability to resolve complex system issues, evaluate options, and implement effective solutions.
Ability to work independently, demonstrate initiative, and interact effectively with cross functional teams.
Strong troubleshooting skills and knowledge of troubleshooting methodologies for system, hardware, and software issues.
In depth knowledge of Windows Server infrastructure including DNS, DHCP, Group Policy, and Active Directory.
Strong understanding of hybrid environments including Microsoft 365, Azure, and related cloud services.
Experience managing user accounts, access controls, and security configurations within enterprise environments.
Experience with scripting and automation, including PowerShell and Linux shell scripting.
Ability to maintain confidentiality and ensure proper handling of sensitive systems and data.
Ability to understand and support users across varying technical skill levels.
Ability to manage multiple priorities in a fast-paced environment, including deadlines, interruptions, and competing demands.
Demonstrates strong proficiency with Windows and Linux based systems and applications.
Demonstrates solid understanding of enterprise infrastructure including networking, email systems, and security controls.
Demonstrates solid networking knowledge including switching, routing, and firewall concepts.
Experience with system integration across Windows and Linux environments.
Experience working in highly available environments supporting critical systems and services.
Proficient with standard office applications and documentation tools.
Strong interpersonal skills with the ability to collaborate effectively across teams.
Strong initiative, proactive work ethic, and prioritization skills.
Sound judgment, decision making, and analytical problem solving skills.
Effective execution and decision making.
Champion of change and promotes innovation.
U.S. Citizenship.

Nice To Haves

Active or recent (within 2 years) Security Clearance a plus.

Responsibilities

Own and administer core enterprise infrastructure, including Windows/Linux servers, Active Directory, DNS, DHCP, M365 services including Entra ID and Exchange Online, and virtualization platforms, ensuring systems are optimized, documented, and resilient.
Lead infrastructure projects and technical implementations.
Support enterprise networking including Cisco based switching, routing, and firewall integrations.
Automate administrative tasks using scripting or infrastructure as code.
Manage the system security lifecycle, including automated patching, vulnerability remediation, and DISA STIG hardening using tools like SCC or OpenSCAP.
Manage identity and access administration within Active Directory and Entra ID, including group policy and role-based access controls.
Monitor system health and security events, leading technical investigations and recovery activities for incident response.
Support backup, recovery, and disaster recovery processes to maintain business continuity.
Manage enterprise backup validation and periodic recovery testing.
Support systems hosted in on premise and cloud environments.
Evaluate and recommend infrastructure improvements or upgrades.
Develop and maintain infrastructure standards and operational best practices.
Maintain architecture documentation and system diagrams.
Participate in after-hours maintenance or incident response activities as needed.
Support secure configuration and documentation efforts aligned to regulatory frameworks such as NIST 800 171 and CMMC.
Performs other duties as assigned.