Core Infrastructure System Administrator (System Administrator 3)- Fremont, CA

M.C. Dean, Inc.

Fremont (CA)

On-site

USD 114,640 - 171,960

Full time

14 days+

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Benefits offered by this job

Medical, dental, vision insurance

401(k) retirement plan

Tuition reimbursement

Paid time off

Paid maternity leave

Job summary

M.C. Dean, Inc. is seeking a Core Infrastructure System Administrator in Fremont, California. This role involves maintaining and supporting electronic security services for various clients. The ideal candidate will have extensive system administration experience and knowledge of security protocols.

This position offers a competitive salary ranging from $114,640 to $171,960 annually, along with comprehensive benefits including medical, dental, and tuition reimbursement.

Qualifications

Experience resolving system problems and analyzing system data.
Ability to manage small teams effectively.
Knowledge of large-scale networking and VLANs.

Responsibilities

Maintain and support physical and cloud-based Windows and Linux servers.
Monitor operational systems for errors and alerts.
Document daily functions and troubleshoot processes.

Skills

System administrator experience

Programming or administering Physical Access Control Systems

Understanding of Windows patching

Advanced knowledge of Windows Active Directory

Proficiency in MS Excel, Word, Visio, PowerPoint

Education

Associate’s Degree and 8+ Years of experience

Bachelor’s Degree and 5+ Years of experience

High School Diploma and 10+ Years of experience

Job description

About M.C. Dean

M.C. Dean is Building Intelligence®. We design, build, operate, and maintain cyber‑physical solutions for the nation’s most mission‑critical facilities, secure environments, complex infrastructure, and global enterprises. With over 9,000 employees, our capabilities span electrical, electronic security, telecommunications, life safety, automation and controls, audiovisual, and IT systems. Headquarters in Tysons, Virginia, we deliver resilient, secure, and innovative power and technology solutions through engineering expertise and smart systems integration.

Why Join Us?

Our people are passionate about engineering innovation that improves lives and drives impactful change. Guided by our core values—agility, expertise, and trust—we foster a collaborative and forward‑thinking work environment and are committed to building the next generation of technical leaders in electrical, engineering, and cybersecurity industries.

Position Overview

Core Infrastructure System Administrator (System Administrator 3). Part of the Security and Electronic Systems (SES) Strategic Business Unit, you will be part of a team that designs, engineers, integrates, operates, and maintains electronic security services inclusive of intrusion detection, access control, biometric authentication, video surveillance, audio visual, IT systems, perimeter defense, and command and control systems for federal, local, and commercial customers across high‑growth markets.

Responsibilities

Maintain production systems, software, hardware, and end devices.
Install, configure, maintain, and support physical and cloud‑based Windows and Linux servers.
Ensure the security, integrity, and availability of systems.
Monitor operational systems for errors and alerts.
Troubleshoot, add, configure, and remove technologies related to access control, intrusion detection, emergency, video, and other security systems.
Document daily functions and troubleshooting processes to create and revise playbooks.

Work Schedule

May require extended hours or weekend support.
On‑site requirements are subject to change and could increase at any time.

Qualifications

Education:

Associate’s Degree and 8+ Years of progressive experience
Bachelor’s Degree and 5+ Years of progressive experience
High School Diploma or Equivalent and 10+ Years of progressive experience

Requirements

System administrator experience performing triage, resolving system problems, analyzing system data, implementing new workstations, and system extensions.
2+ years of experience programming or administering Physical Access Control Systems.
Experience effectively managing small teams.
Understanding of Windows patching and vulnerability remediation.
Advanced knowledge of Windows Active Directory hierarchy and implementation.
Basic knowledge of large‑scale networking, VLANs, and routing.
Reliable attendance at customer site during required work hours.
Ability to work flexible shifts that include nights, weekends, and holidays as needed.
Minimum of one security certification (Security+, CASP, or CISSP).
Background working with multidisciplinary teams.
Time management and organization skills to meet deadlines and quality objectives.
Proficiency in MS Excel, Word, Visio, and PowerPoint.

Travel

Up to 25% annual travel.

What We Offer

A collaborative team inspired by engineering and innovation to enhance customer outcomes and improve lives.
An opportunity to lead and build a business with support from an industry‑leading firm with 75 years of experience.
Investment in your skills through professional and technical training programs, including leadership training and tuition reimbursement.
Open and transparent communication with senior leadership and local office management.

Benefits Package