Role description

Senior IMS & 5G Core Network Support Engineer

Lead I - Software Engineering

UST is searching for a Senior IMS & 5G Core Network Support Engineer who will provide advanced troubleshooting support for IMS, VoLTE, EPC, and 5G Core network issues impacting voice and data services.

The opportunity:
• Analyze SIP, Diameter, GTP, and IP signaling flows to identify root causes of network failures and service degradation.
• Troubleshoot IMS Core components including CSCF, SBC, BGCF, TAS, HSS/UDM, MRF, and related voice core platforms.
• Investigate VoLTE/VoNR call failures, registration issues, session setup failures, handover problems, and media-related issues.
• Perform detailed log analysis, packet captures, and protocol trace reviews using tools such as Wireshark, NetScout, Splunk, and OpenSearch.
• Support troubleshooting and escalation handling for EPC/5GC nodes including MME, AMF, SMF, SGW, PGW, and UPF.
• Participate in major incident bridge calls and provide technical leadership during network outages and service-impacting events.

This position description identifies the responsibilities and tasks typically associated with the performance of the position. Other relevant essential functions may be required.

What you need:
• Minimum 5 years of experience in telecom Core Network support or ATAC environments.
• Strong understanding of IMS/Core technologies and telecom operational processes.
• Experience troubleshooting telecom voice and data network services.
• Knowledge of IMS Core components such as CSCF, SBC, BGCF, TAS, HSS, MRF, and related technologies.
• Familiarity with SIP, Diameter, and IP networking protocols.
• Strong analytical, troubleshooting, and problem-solving skills.
• Experience coordinating with vendors and cross-functional engineering teams.
• Ability to work effectively in high-pressure operational environments.
• Technical Skills
• Experience with telecom monitoring and troubleshooting tools.
• Familiarity with Splunk, OpenSearch, NetScout, Wireshark, or similar diagnostic platforms.
• Working knowledge of Linux/Unix environments.
• Experience with ticketing and incident management systems.
• Exposure to automation tools and scripting is preferred.

Compensation can differ depending on factors including but not limited to the specific office location, role, skill set, education, and level of experience. UST provides a reasonable range of compensation for roles that may be hired in various U.S. markets as set forth below.

Role Location: Texas

Compensation Range: $75,000-$113,000

Benefits

Full-time, regular employees accrue a minimum of 10 days of paid vacation per year, receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year), 10 paid holidays, and are eligible for paid bereavement leave and jury duty. They are eligible to participate in the Company's 401(k) Retirement Plan with employer matching. They and their dependents residing in the US are eligible for medical, dental, and vision insurance, as well as the following Company-paid Employee Only benefits: basic life insurance, accidental death and disability insurance, and short- and long-term disability benefits. Regular employees may purchase additional voluntary short-term disability benefits, and participate in a Health Savings Account (HSA) as well as a Flexible Spending Account (FSA) for healthcare, dependent child care, and/or commuting expenses as allowable under IRS guidelines. Benefits offerings vary in Puerto Rico.

Part-time employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year) and are eligible to participate in the Company's 401(k) Retirement Plan with employer matching.

Full-time temporary employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year) and are eligible to participate in the Company's 401(k) program with employer matching. They and their dependents residing in the US are eligible for medical, dental, and vision insurance.

Part-time temporary employees receive 6 days of paid sick leave each year (pro-rated for new hires throughout the year).

All US employees who work in a state or locality with more generous paid sick leave benefits than specified here will receive the benefit of those sick leave laws.

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