OXIO Corporation

Jun 23, 2026

IMS Core Engineer

RemoteUnited States

United States

Python

About the opportunity

IMS Core Engineer / Architect

The IMS/VoLTE Integration Engineer will analyze, prepare, implement and verify the configuration and integration of a node, network and/or system. Your scope of work could include the scenarios of introduction, upgrade expansion, functionality and capacity. Your work will in part form our customer legacy.

Key responsibilities

As part of the mobile core team, you will take care of our IMS mobile platform; you will have the following responsibilities:

Manage networks and nodes within the IMS domain for our 2.5G, 3G & 4G networks (SIP, H323, IMS/IMT, VoLTE, VoWiFi)

Using dashboards (and building new ones) to clearly and quickly discover issues and patterns

Accountable and responsible to follow the communications procedures in place when handling an incident. Communication is both internal within our company and external to our third-party providers.

Maintenance, troubleshooting, security audits, and emergency response

Undertake fault handling and corrective actions on node, service and infrastructure level

Handle project activities, implementing / adapting (new) IMS E2E service functionalities, nodes, services

When needed, cover the 7x24 monitoring shift responsibilities (On call support, Baby Sitting activities etc.)

Wireshark tracing of critical infrastructure to debug issues

Provide input, implement and verify improvements in processes and work instructions ·

Verify and implement configuration changes

Work to identify and drive improvement

Key Qualifications

At least 10 years’ experience in the core network domain with a mobile networks

Holding a BSc degree in Telecommunication or Computer Science (post-graduate studies are a bonus) and 10+ years core telecommunications network experience.

Working knowledge of telecom networks like 2G, 2.5G, 3G and LTE (MME, SGW, PGW, and MME).

Great Conceptual understanding of IMS evolution and trends - IMS Subsystems, functionalities and IMS services call flows.

Great knowledge of IMS network topology (their various interfaces), Core IMS Parameters and Features.

Worked on different type of Core Nodes, CSFB, IMS (P-CSCF, I-CSCF, S-CSCF, MTAS, HSS, CUDB, MGCF, etc.).

Experience with SS7, ISUP, BICC, SIP, H248, Diameter signaling & protocols configuration change IMS based services is necessary.

Operation and maintenance of IMS platforms for Alarms, faults/abnormal conditions handling, Analysis of traces, High troubleshooting skills, system backup/restore from backup files, Fault Diagnostics, Preventive Maintenance & upgrades of IMS nodes.

Configuration preparation & implementation for configuration changes requests for IMS nodes and Integration for all nodes (S-CSCF, I-CSCF, MTAS, HSS, CUDB, etc.) as well.

Hands on with sniffers, Wireshark and testing tools in advanced mode.

Hands on with Linux/Unix based systems (you can find your way around a linux shell).

Understanding of 3GPP, ITU-T and ANSI standards.

Understanding of roaming agreements and IR.21, including IREG testing.

VoLTE Troubleshooting and call trace analysis.

Strong writing and documentation skills are needed to develop reports.

Adaptability and responding to change.

Be able to work under pressure.

You are fluent in English (written and spoken).

Ready to work on morning/afternoon shifts.

Good interaction with external customers and internal teams.

Nice to have

2+ years scripting experience (Python, Bash, etc.)

OXIO is committed to fostering a diverse, equitable, and inclusive workplace where all employees feel valued and empowered. We believe that diversity in all its forms drives innovation and creativity, and we strive to create an environment that reflects and celebrates the unique backgrounds, perspectives, and talents of our employees. We do not discriminate against any employee or applicant for employment based on race, color, religion, sex (including pregnancy, gender identity, and sexual orientation), national origin, age, disability, genetic information, veteran status, or any other characteristic protected by applicable federal, state, or local law. We are dedicated to providing a work environment free from discrimination and harassment. We committed to ensuring that all qualified applicants have an equal opportunity to apply for job openings. If you need assistance or an accommodation due to a disability, please contact us at hr@oxio.io for more information.

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IMS Core Engineer

About the opportunity

Key responsibilities

Key Qualifications

Nice to have

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