Systems Engineer (Voice) with Security Clearance

Cornerstone Defense LLC; Sterling (VA); On-site; USD 110,000 - 140,000; Full time

Benefits offered by this job

Medical plan

Dental plan

Vision plan

401(k)

Job summary

Cornerstone Defense LLC is seeking a Systems Engineer (Voice) to design, test, and deploy enterprise voice solutions in a secure IT environment. The role involves collaboration with network and telecom teams to integrate telephony and call center components.

The candidate will support voice system upgrades, participate in accreditation processes, and gain hands-on experience with VoIP devices and encryption infrastructure.

Qualifications

• Minimum of 3 years experience as a Systems Engineer.
• Experience with enterprise IT environments and voice-related integration tasks.
• Familiarity with VoIP infrastructure and voice platforms such as PBXs and call centers.

Responsibilities

• Design, test, and deploy voice infrastructure enhancements.
• Support implementation of next-generation voice technologies.
• Attend meetings with internal teams and clients to gather voice system requirements.
• Monitor compliance with standards, policies, and procedures.

Skills

VoIP

SIP signaling

Call routing

Enterprise voice

Security best practices

Education

Bachelor's or Master’s in Computer Science / Computer Engineering

Tools

Linux

SIP signaling

H.323

DNS

DHCP

RTP

Skype for Business

Avaya Communication Manager

PBXs

Encryption devices

Call management servers

Cisco Voice certifications

Juniper certifications

Job description

Title: Systems Engineer (Voice) Location: Dulles, VA

Company Overview:

Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission. Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation's toughest and most secure problems. If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don't look any further than Cornerstone Defense.

Benefits Overview :

Medical, Dental and Vision Plans

• Generous PTO Policy
• 401(k)
• HSA and FSA options
• Life and Disability Insurance
• Tuition Reimbursement and Training
• Perks at Work Discount Program
• Referral Program
• Leads Generation Program
• CollegeAmerica 529
• Fitness Reimbursement Program
• Travel Assistance
• Norton Lifelock Benefit Solutions
• Life Planning Financial & Legal Services
• Required Education, Experience, & Skills: We are actively seeking Systems Engineers with a minimum of 3 years experience. Undergraduate or graduate degree in computer science or computer engineering. Specific skills may include the following:
• Work in an enterprise IT environment with specific tasks related to Voice
• Collaborate with network engineering and other telecom engineers in integration activities involving telephony or call center
• Assist in the design, testing, and deployment of new voice infrastructure
• Support implementation of next-generation voice technologies
• Participate in the system security accreditation process
• Provide certificate management support for secure systems
• Assist with system upgrades, patching, and configuration
• Support new site voice system standups
• Support call center technology deployments, user training, and transition planning
• Contribute to call routing and trunking design within enterprise voice platforms
• Attend meetings with internal teams and clients to gather and understand voice system requirements
• Monitor compliance with established standards, policies, and procedures
• Gain hands‑on experience with secure voice devices (e.g., VoIP phones, STEs, Viper) and infrastructure components (e.g., PBXs, encryption devices, call management servers)
• Learn to provide Tier 4 engineering support under supervision
• Learn and support platforms such as Skype for Business, Avaya Communication Manager, and other enterprise call center technologies
• Preferred Education, Experience, & Skills:
• Linux
• SIP signaling and call flows
• Secure Real-Time Transport Protocol
• SIP
• TCP/IP
• H.323
• DNS
• DHCP
• RTP Certifications
• MCSE certification
• A+ certification
• Network+ certification
• CCNA, CCNP, ITIL, CCIE, HP, CCVP, CCDP, CATE, R&S
• Cisco Voice certifications
• Juniper certifications