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Salary
≈ $73k – $133k per year (Estimated)
Location
In office (O'Fallon)
Seniority
Middle · 2+ years exp

Confirmed on the employer's own hiring board on Oct 19, 2026. First seen by Alion on Oct 14, 2026.

Overview
Company
Impact
Profile match
I2X Technologies, the trading name of ISYS Incorporated, is a government services contractor headquartered in Littleton, Colorado, that provides mission support, software and systems engineering, cybersecurity and enterprise IT services. With more than 20 years in the market, it supports the Department of Defense and other federal agencies, often on space and satellite programs, with staff at sites in more than 20 states, including Colorado Springs, Huntsville, Fort Meade, Hill Air Force Base and Fairbanks. It hires systems test, network, DevSecOps, software and mechanical engineers, Python developers, system and database administrators and security officers, most with clearances.

Minimum Clearance Required

Secret

Responsibilities

I2X Technologies is a reputable technology services company to the Federal Government. Whether the focus is on space exploration, national security, cyber security, or cutting-edge engineering applications, I2X is ready to offer you the chance to make a real-world impact in your field and for your country. We provide long-term growth and development. Headquartered in Colorado, I2X is engaged in programs across the country and in more than 20 states. Our programs support multiple Federal agencies, the Department of Defense and often focused on the space initiatives of our government customers.

  • Perform engineering tasks to maintain a large, complex and highly resilient IP voice and video communications infrastructure.

  • Manage, configure, troubleshoot and assure service supporting all aspects of a voice, video and data network. Must be organized, document oriented, possess skills in diagramming, and understand WAN principals.

  • Perform system maintenance, support capacity planning activities and complete configuration change actions and documentation efforts.

  • Configure and implement calling search spaces, route plans, route partitions, route lists and device profiles.

  • Configure Cisco or Juniper routing and switching devices.

  • Support distributed firewall infrastructure.

  • Provide input in the development of technical policy, work instructions and reporting in support of an enterprise IP telephony network.

  • Analyze and resolve complex technical problems utilizing foundational knowledge of SIP signaling and call-flows.

  • Analyze and resolve remote site registration, signaling and media problems.

  • Configure route plans, route lists, device profiles, calling search spaces, and route partitions.

  • Validate change requests and ensure accuracy.

  • Perform fault analysis and configuration of voice subscribers, call handlers and call routing rules.

  • Perform fault analysis and configuration of Cisco and or Juniper routing and switching rules.

Qualifications

  • Currently possess DoD 8750 certification at IAT level II, Security+ CE or equivalent to meet requirement.

  • Experience with one or multiple Cisco, Avaya or Oracle voice platforms including Cisco Unified Communications Manager (CUCM), Cisco Unity, Cisco Unified Border Element (CUBE), Oracle Session Border Controller (SBC) and Avaya Aura Application Server.

  • Expertise in SIP internetworking signaling and call flow.

  • Demonstrable experience of advanced fault analysis to isolate and diagnose network problems for routing, switching, security and large scale voice implementations.

  • Currently possess an active Secret security clearance.

Preferred Qualifications:

  • Working knowledge of Secure Real-Time Transport Protocol (SRTP) including associated G.711 and G.729 codecs and Digital Tone Multi Frequency (DTMF).

  • Experience with Cisco Unified Communications Manager and or Avaya Aura soft switches.

  • Experience with Oracle SBCs and other voice media gateway appliances.

  • Experience supporting distributed firewall infrastructure.

  • Experience creating/supporting IPSec MPLS VPN infrastructure

  • Experience implementing and supporting BGP routing protocols

  • Experience designing, configuring and troubleshooting QoS classification, marking and prioritization of network traffic (voice, critical applications, etc.).

  • Familiarity with IPSec implementation and troubleshooting.

Required Education and Experience:

  • Requires BS degree and 2-4 years of prior relevant experience or Masters with less than 2 years of prior relevant experience. (Or equivalent combination of education and/or experience.)

Essential Requirements:

US Citizenship is required.

Active Secret

I2X Technologies is an Equal Opportunity/Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, gender identity, national origin, age, protected Veteran status, or disability status.

In compliance with Colorado’s Equal Pay for Equal Work Act, the annual base salary range for this position is listed . Please note that the salary information is a general guideline only. I2X Technologies considers factors such as (but not limited to) scope and responsibilities of the position, candidate’s work experience, education/training, key skills, internal peer equity, as well as, market and business considerations when extending an offer.

Physical Demands:

The physical demands described here are representative of those that must be met by an employee to successfully perform the essential functions of this job with or without reasonable accommodation.

While performing the duties of this job, the employee will regularly sit, walk, stand and climb stairs and steps. May require walking long distance from parking to work station. Occasionally, movement that requires twisting at the neck and/or trunk more than the average person, squatting/ stooping/kneeling, reaching above the head, and forward motion will be required. The employee will continuously be required to repeat the same hand, arm, or finger motion many times. Manual and finger dexterity are essential to this position. Specific vision abilities required by this job include close, distance, depth perception and telling differences among colors. The employee must be able to communicate through speech with clients and public. Hearing requirements include conversation in both quiet and noisy environments. Lifting may require floor to waist, waist to shoulder, or shoulder to overhead movement of up to 20 pounds. This position demands tolerance for various levels of mental stress.

I2X Technologies is an Engineering and Information Technology Company focused on providing Services to the Federal and State Government. I2X offers a competitive compensation program and comprehensive benefits package to our employees.

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