Systems Engineer (Voice) with Security Clearance

Cornerstone Defense LLC; Sterling (VA); On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

Medical

Dental

Vision

401(k)

HSA/FSA

Life Insurance

Disability Insurance

Tuition Reimbursement

Perks at Work

Referral Program

Travel Assistance

Fitness Reimbursement

529 Plan

Financial & Legal Services

Job summary

Cornerstone Defense LLC seeks a Systems Engineer focusing on Voice to support enterprise voice platforms and telephony integration. You will design, test and deploy voice infrastructure, and work with network engineers on call routing and security practices.

The role includes assisting in site voice system standups and call center deployments. Ideal candidates have 3+ years in systems engineering with a CS/CE background, experience with VoIP, SIP, and voice platforms, and a drive to learn

Qualifications

• Minimum 3 years of Systems Engineer experience in enterprise IT with voice focus.
• Undergraduate or graduate degree in computer science or computer engineering.
• Experience with voice infrastructure design, testing, deployment and security accreditation.

Responsibilities

• Design, test, and deploy voice infrastructure and next‑gen voice tech.
• Support site voice system standups and call center deployments.
• Collaborate with network/telecom engineers on integration activities.
• Attend meetings to gather voice system requirements and ensure standards compliance.
• Provide Tier 4 engineering support under supervision.

Skills

VoIP systems

SIP signaling

Call routing

Network engineering

Security accreditation

Linux

TCP/IP

DNS

DHCP

RTP

Education

BS in CS or CE

Tools

Skype for Business

Avaya CM

PBX systems

Encryption devices

Voice platforms

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 : Cornerstone Defense offers a very comprehensive benefits package including, but not limited to: 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