System Administrator 3 - Chantilly, VA

M. C. Dean; Chantilly (VA); On-site; USD 110,000 - 150,000; Full time

Benefits offered by this job

Competitive salary

Medical insurance

Dental insurance

Vision insurance

401k Retirement Plan

Paid time off

Tuition reimbursement

Job summary

M.C. Dean is seeking a System Administrator 3 to support the Security and Electronic Systems unit at customer sites in the Washington DC area. The role focuses on maintaining physical security and IT systems, including AD, Windows servers, and virtualization platforms.

Responsibilities include tiered incident response, patch management, and ensuring compliance with security standards. Travel to CONUS locations may be required; strong communication with stakeholders is essential.

Qualifications

• Bachelor's Degree or higher with progressive IT experience.
• 2+ years in Physical Access Control Systems or related IT security.
• Experience with Windows patching and vulnerability remediation.
• Demonstrated ability to manage AD and Windows infrastructure at scale.
• Strong collaboration and communication with customers and teams.

Responsibilities

• Monitor, maintain, and test Physical Access Control, CCTV, PSIM and IT systems.
• Provide Tier 2 escalation support and communicate status to management.
• Perform daily Active Directory management and system log reviews.
• Configure and maintain virtual hypervisors and VDI platforms (Citrix Xen Desktop).
• Install, configure, and maintain Windows servers, storage, and 3rd party apps.
• Apply STIGs and IA standards to Windows environments.
• Travel up to 10% to customer sites as needed.
• Produce technical documentation and SOPs for operations.

Skills

Windows administration

Active Directory

Security practices

Troubleshooting

Virtualization

Education

Bachelor's Degree

Associates Degree

HS Diploma

Tools

VMware

Hypervisor

Citrix Xen Desktop

SQL Server

Dell storage

ACAS/HBSS

Job description

Overview

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, M.C. Dean delivers resilient, secure, and innovative power and technology solutions through engineering expertise and smart systems integration.

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, M.C. Dean delivers 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. At M.C. Dean, we are committed to building the next generation of technical leaders in electrical, engineering, and cybersecurity industries.

We are seeking a System Administrator 3 to join our Security and Electronic Systems (SES) business unit. As part of the SES Strategic Business Unit you will be part of a dynamic team responsible for design, implementation, operations & maintenance, and cybersecurity for large complex resilient hardware and virtualized infrastructure to ensure implemented solutions meet stakeholder needs, standards, and performance requirements.

Responsibilities

What you’ll do:

In this role you will be working as part of a team to monitor, maintain, and test Physical Access Control, CCTV, PSIM and other electronic security systems and support implementation, troubleshooting and maintenance of Information Technology (IT) systems in support of the endpoint devices. The position provides Tier 2 (Escalation) problem identification, diagnosis and resolution of problems and supports the escalation and communication of status to agency management and internal customers.

This position requires onsite support at a single work location in the Washington D.C. area. Candidates must be flexible in schedule, have the ability to travel, and be able to communicate professionally with customers and coworkers. Punctuality, attendance, a willingness to learn, and an ability to work well with others are key to success in this role.

Main responsibilities include but are not limited to:

• Manage physical security system support to meet service level agreements.

• Configure and manage Windows operating systems and install/load operating system software.

• Perform desktop hardware and operating system set‑up, imaging software loading, and antivirus updates.

• Analyze security system infrastructure performance and recommend improvements.

• Troubleshoot, maintain integrity and configure components along with implementing operating systems enhancements to improve reliability and performance.

• Provide detailed analysis and feedback to agency management and internal customers for escalated tickets.

• Perform IAVA updates and patching to ensure compliance with Information Assurance (IA) standards.

• Apply Security Technical Implementation Guides (STIGs) to Windows based operating systems (servers and workstations).

• Implement and maintain sophisticated enterprise Windows Active Directory Architectures.

• Perform daily operations to include Active Directory management, monitoring and reviewing system logs.

• Configure and maintain virtual hypervisors to include VMware and Hypervisor.

• Deploy, configure, and maintain Virtual Desktop Infrastructure (VDI) platforms to include Citrix Xen Desktop.

• Install, configure, and maintain 3rd party applications.

• Install, configure and maintain highly available SQL database Engines.

• Deploy and maintain storage platforms similar to Dell EqualLogic and Dell Powervault.

• Analyze requirements of future deployments and make recommendations for IT infrastructure including all hardware and software required to fulfill those requirements.

• Perform root cause analysis on significant issues across all tiers of support.

• Perform preventive maintenance actions including system back‑ups, error log reviews, database size analysis, and integrity checks.

• Develop new system and application implementation plans to include testing procedures and ensuring operational reliability.

• Stay current with technological developments and make recommendations for ways to take advantage of new and emerging technology.

• Create technical documentation such as standard operating procedures (SOP) and as‑built for both technical and non‑technical audiences.

• Train system users and other system support personnel as needed.

• Perform all duties with minimal direct supervision.

Qualifications

Clearance/Citizen Type:

Applicants selected will be subject to a government security investigation and must meet eligibility requirements, including U.S. Citizenship, for access to classified information; Active Top Secret w/ SCI with the ability to obtain a polygraph is REQUIRED.

Key Requirements:

• Education:

• Bachelor's Degree and 5+ Years of progressive experience or

• Associates Degree and 8+ Years of progressive experience or

• HS Diploma or Equivalent and 10+ Years of progressive experience

• Requires system administrator experience in performing triage on system problems, resolving the system problems, analyzing system data to prevent problems, implementing new workstations, and system extensions.

• Requires 2 + years of experience programming/administrating Physical Access Control Systems.

• Demonstrated previous experience effectively managing small teams.

• Demonstrated understanding of Windows patching and vulnerability remediation.

• Demonstrated advanced knowledge of Windows active directory hierarchy and implementation.

• Basic knowledge of large-scale networking, VLANs and routing.

• Requires reliable attendance at customer site during work hours required by customer.

• Requires the ability to work flexible shifts that include nights, weekends and holidays as needed.

• Requires minimum of Security+ Certification, CASP, or CISSP certification.

• Demonstrated background working with multidisciplinary teams.

• Demonstrated time management and organization skills to meet deadlines and quality objectives.

• Proficient in MS Excel, Word, Visio, and PowerPoint.

Preferred Experience:

• Proficiency with ACAS and HBSS and mitigation strategies

• Assessment, mitigation, and closure of network vulnerabilities and vulnerability management eMASS

• Applying STIGs to servers, databases, applications, and other hardware Security Readiness Review (SRR) Tools (scripts and ACAS)

• Excellent understanding of the DoD RMF lifecycle and NIST 800‑53 controls implementation

• Awareness of NIST Special Publication 800‑82, Guide to Industrial Control Systems (ICS) Security and UFC 4‑010‑06 Unified Facilities Criteria (UFC) Cybersecurity of Facility

Travel:

• Up to 10% annual, CONUS and OCONUS locations.

What we offer:

• A collaborative team inspired by the way engineering and innovation enhance customer outcomes, improve lives, and change the world for the better. We are driven by our core values of agility, expertise, and trust.

• An opportunity to lead and build a business with the support of an industry‑leading firm that has been in business for 75 years.

• Investment in your skills and expertise through a combination of professional and technical training programs, including leadership training and tuition reimbursement.

• Open and transparent communication with senior leadership as well as local office management.

We offer an excellent benefits package including:

• A competitive salary

• Medical, dental, vision, life, and disability insurance

• Paid time off

• Tuition reimbursement

• 401k Retirement Plan

• Military Reserve pay offset

• Paid maternity leave

Abilities

• Exposure to computer screens for an extended period of time.

• Sitting for extended periods of time.

• Reach by extending hands or arms in any direction.

• Have finger dexterity in order to manipulate objects with fingers rather than whole hands or arms, for example, using a keyboard.

• Listen to and understand information and ideas presented through spoken words and sentences.

• Communicate information and ideas in speaking so others will understand.

• Read and understand information and ideas presented in writing.

• Apply general rules to specific problems to produce answers that make sense.

• Identify and understand the speech of another person.