SENIOR SYSTEM INFRASTRUCTURE ENGINEER
Confirmed on the employer's own hiring board on Nov 5, 2026. First seen by Alion on Nov 4, 2026.
Hours: 7am - 3:30pm
100% On-site
JOB SUMMARY:
The Senior System Infrastructure Engineer will design, maintain, secure, and support our enterprise technology infrastructure. This is a hands-on senior technical role responsible for server virtualization, enterprise storage, Windows Server systems, networking, firewalls, VPN connectivity, wireless infrastructure, cybersecurity, and related technology platforms.
DUTIES/RESPONSIBILITIES:
The requirements listed below are representative of the essential duties required:
- Design, install and configure internal and customer-facing servers, network devices, and firewalls.
- Proactively manage and maintain the server, network, and firewall systems.
- Administer and support Microsoft Exchange on premises and online.
- Administer and support core Microsoft, Cisco, and VMware technologies.
- Develop and implement project plans, risk assessments, and contingency plans.
- Design and implement monitoring, configuration management, and reporting functions that will make a hands-off environment.
- Define and document best practices and support procedures.
- Provide after-hours support for Infrastructure related emergencies as well as occasional weekend maintenance.
- Assist with hardware, firewall, telecom, and software vendor evaluation, recommendation, and negotiations.
- Mentor/cross-train team members on existing and new technologies.
- Carry out special tasks at Management's direction.
- Interact with vendors and staff at the technical level, as required.
- Other duties as assigned.
LEVEL OF RESPONSIBILITY:
- Employee may work independently, but work is often reviewed by immediate supervisor.
- Employee exercises broad discretion on matters of significance within functional areas.
- Employee advises others within the organization on matters within area of expertise.
REQUIRED SKILLS/ABILITIES:
- Advanced knowledge of Windows Operating Systems current and legacy versions.
- Managing at least 50 Windows Server infrastructure.
- Experience with Microsoft Entra, Exchange, M365, Intune, and Defender.
- Strong hands-on experience with VMware vSphere, ESXi, and vCenter.
- Strong experience administering NetApp storage systems.
- Advanced knowledge of Microsoft Windows Server 2019 or newer.
- Strong knowledge of Active Directory, Group Policy, DNS, and DHCP.
- Experience administering and troubleshooting Cisco ASA firewalls.
- Strong knowledge of site-to-site and remote-access VPN technologies.
- Strong understanding of TCP/IP, VLANs, subnetting, routing, switching, and network segmentation.
- Hands-on experience supporting Cisco Meraki switches and wireless access points.
- Strong understanding of cybersecurity principles, including infrastructure hardening, vulnerability management, patching, secure access, and network security.
- Experience with backup, disaster recovery, and business continuity technologies.
- Experience troubleshooting complex server, network, storage, firewall, VPN, and infrastructure problems.
- Strong technical documentation and organizational skills.
- Demonstrated ability to independently manage complex technical projects and issues.
- Strong written and verbal communication skills.
- Ability to communicate effectively with technical teams, business users, vendors, and management.
PREFFERED SKILLS/ABILITIES:
- Ability to support a legacy VAX Environment.
- SQL, VB.net, HTML Coding Skills.
- Experience with Nutanix AHV, Prism Central, Prism Element, or Nutanix hyperconverged infrastructure is highly desirable.
EDUCATION AND EXPERIENCE:
- Bachelor’s degree in computer science (or related area) preferred.
- 15 or more years of experience with advanced networking in a corporate environment.
- One or more of the following certifications:
- VMware Certified Professional (VCP)
- Cisco CCNA or CCNP
- Microsoft certifications
- NetApp Certified Data Administrator
- Nutanix Certified Professional
- CISSP or similar cybersecurity certification
WORKING CONDITIONS AND PHYSICAL REQUIREMENTS:
The work environment characteristics described here are representative of those encountered while performing the essential functions of this job.
Physical Demands/Efforts
- Occasional physical exertion including the lifting of objects exceeding 20 pounds.
- Repetitive hand motions.
- Occasional strenuous walking, standing, bending, and climbing.
- Working in an office environment with frequent work in the factory.
Mental & Visual Demands/Efforts
- Significant level of mental concentration required to manage multiple complex tasks.
- Maintain emotional control under stress, hectic pace, and work with frequent interruptions.
- Work requires frequent visual effort for extended periods of time.
Work Environment and Hazards
- Regular work in utility closets, cable chases, and above suspended ceilings.
- Some exposure to hazards that might cause minor injury.
- Occasional prolonged and irregular work hours.
- May be required to be on-call after hours.
- Occasional Travel to our subsidiary in Milford, CT.
- Travel may be required for off-site training.
AMERICANS WITH DISABILITIES ACT
David Clark Company complies with all aspects of the Americans with Disabilities Act (ADA) and state disability laws. This means that we will not discriminate against qualified individuals with a disability in any phase of the employment relationship including application for employment, hiring, promotions and/or advancement opportunities, termination, compensation, training and any other conditions or privileges of employment.
This job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities. Duties, responsibilities and activities may change, or new ones may be assigned at any time with or without notice.
Equal Employment Opportunity Policy
David Clark provides equal employment opportunities to all employees and applicants for employment andprohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.
This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training.