System Administrator 3 - Dallas, TX

M.C. Dean, Inc • Dallas, TX

17d • Onsite

About The Position

M.C. Dean is seeking a System Administrator 3 to join its Security and Electronic Systems (SES) business unit. The role supports the design, implementation, operation, maintenance, and cybersecurity of complex, resilient hardware and virtualized infrastructure. The administrator works on a team monitoring, maintaining, and testing physical access control, CCTV, PSIM, and other electronic security systems, while supporting IT systems for endpoint devices. The position provides Tier 2 escalation support, including problem identification, diagnosis, resolution, and status communication to agency management and internal customers.

The role requires onsite support at a single work location. The successful candidate must be flexible in schedule, able to travel, communicate professionally, and work effectively with customers and coworkers. Duties are performed with minimal direct supervision and include system administration, security compliance, infrastructure analysis, preventive maintenance, technical documentation, user training, and recommendations for future deployments and emerging technology.

Requirements

• Bachelor's degree and at least 5 years of progressive experience; or an associate degree and at least 8 years; or a high school diploma or equivalent and at least 10 years.
• Experience as a system administrator triaging and resolving system problems, analyzing system data to prevent problems, implementing new workstations, and implementing system extensions.
• At least 2 years of experience programming or administering Physical Access Control Systems.
• Demonstrated experience effectively managing small teams.
• Demonstrated 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 the customer site during customer-required work hours.
• Ability to work flexible shifts, including nights, weekends, and holidays as needed.
• Minimum Security+ certification, CASP, or CISSP certification.
• Background working with multidisciplinary teams.
• Time management and organizational skills to meet deadlines and quality objectives.
• Proficiency in MS Excel, Word, Visio, and PowerPoint.
• Ability to travel up to 10% annually, including to CONUS and OCONUS locations.
• Ability to perform the listed physical and communication functions, including extended screen exposure and sitting, reaching, keyboard dexterity, listening, speaking, reading, and understanding information.

Nice To Haves

• Proficiency with ACAS and HBSS and their mitigation strategies.
• Experience assessing, mitigating, and closing network vulnerabilities and managing vulnerabilities in eMASS.
• Experience applying STIGs to servers, databases, applications, and other hardware using Security Readiness Review tools, scripts, and ACAS.
• Excellent understanding of the DoD RMF lifecycle and implementation of NIST 800-53 controls.
• Awareness of NIST Special Publication 800-82, Guide to Industrial Control Systems Security, and UFC 4-010-06, Unified Facilities Criteria Cybersecurity of Facility.

Responsibilities

• Manage physical security system support to meet service level agreements.
• Configure and manage Windows operating systems and install or load operating system software.
• Set up desktop hardware and operating systems, load imaging software, and update antivirus software.
• Analyze security system infrastructure performance and recommend improvements.
• Troubleshoot and maintain system integrity, configure components, and implement operating system 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 comply with Information Assurance standards.
• Apply STIGs to Windows-based server and workstation operating systems.
• Implement and maintain enterprise Windows Active Directory architectures.
• Perform daily operations including Active Directory management and monitoring and reviewing system logs.
• Configure and maintain virtual hypervisors, including VMware and Hypervisor.
• Deploy, configure, and maintain VDI platforms, including Citrix Xen Desktop.
• Install, configure, and maintain third-party applications.
• Install, configure, and maintain highly available SQL database engines.
• Deploy and maintain storage platforms similar to Dell EqualLogic and Dell PowerVault.
• Analyze future deployment requirements and recommend the IT infrastructure, hardware, and software needed to meet them.
• Perform root cause analysis on significant issues across all support tiers.
• Perform preventive maintenance, including system backups, error log reviews, database size analysis, and integrity checks.
• Develop system and application implementation plans, including testing procedures, and ensure operational reliability.
• Stay current with technological developments and recommend ways to use emerging technology.
• Create technical documentation, such as SOPs and as-builts, for technical and non-technical audiences.
• Train system users and other system support personnel as needed.
• Work onsite at a single customer location and provide reliable attendance during customer-required work hours.
• Travel to CONUS and OCONUS locations, up to 10% annually.
• Work flexible shifts that may include nights, weekends, and holidays as needed.

Benefits

• Professional and technical training programs, including leadership training.
• Tuition reimbursement.
• Open and transparent communication with senior leadership and local office management.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior