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**ManTech** seeks a motivated, career and customer-oriented **Telephony Engineer** to join our team in **McLean, VA** . In this **hybrid part-time** role, you'll combine expertise in telephony systems, Linux server management, and software development, focusing on VoIP, analog, ISDN systems, and Ruby on Rails for telephony applications.

_Responsibilities include, but are not limited to:_

+ Design, develop, and maintain voice media gateways for VoIP, analog, and ISDN systems. Install, configure, and troubleshoot telephony hardware and media gateways across secure networks.

+ Leverage BESS Billing and Provisioning Tools to optimize telephony systems and ensure seamless service delivery.

+ Configure and maintain Linux servers (Ubuntu, CentOS) for hosting telephony and web applications, ensuring performance, security, and scalability. Develop and troubleshoot applications using PowerBuilder, Korn shell, and Ruby on Rails.

+ Integrate telephony systems (e.g., IVR, call routing) into web applications using Ruby on Rails. Modernize legacy code and ensure reliable operation of telephony solutions.

+ Maintain clear technical documentation and provide ongoing support for telephony system integration, performance optimization, and troubleshooting.

+ Provide training and guidance to team members and stakeholders on telephony system integration, BESS tools, and server management best practices. Ensure comprehensive understanding of application workflows and troubleshooting processes.

Minimum Qualifications:

+ BA/BS and 11+ years of experiences, or a combination of education and work experience equivalent to 15+ years.

+ Familiarity with BESS Billing and Telephony Provisioning Tools.

+ Experience integrating telephony systems with web applications (e.g., handling inbound/outbound calls, IVR, call routing).

+ Advanced knowledge of Linux server management (Ubuntu, CentOS), including installation, configuration, troubleshooting, and performance optimization.

+ Strong verbal and written communication skills to interact effectively with cross-functional teams.

Preferred Qualifications:

+ Proficiency in Ruby programming and the Ruby on Rails framework, along with strong experience in telephony system integration.

+ Experience with scripting languages, including PowerBuilder and Korn shell, for system administration tasks.

+ Oracle Database Administrator certification is a plus.

+ Experience in provisioning telephony services.

Clearance Requirements:

+ Must have a current/active TS/SCI with Polygraph.

Physical Requirements:

+ Must be able to remain in a stationary position at least 50% of the time. Constantly operate a computer, phone, and other office equipment for extended periods of time.

ManTech International Corporation, as well as its subsidiaries proactively fulfills its role as an equal opportunity employer. We do not discriminate against any employee or applicant for employment. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or status as a protected veteran.

If you are a qualified individual with a disability and require a reasonable accommodation to apply for a position with ManTech through its online applicant system, please email us at [email protected] and provide your name and contact information.