The Roaming & Service Assurance Sr. Consultant is responsible for ensuring the end-to-end availability, performance and customer experience of international roaming and interconnection services. The role provides advanced technical support, coordinates complex investigations and escalations, and works across Mobile Core, NOC, O&M;, vendors, IPX providers and international operators to restore services, identify root causes and drive corrective and preventive actions.

- Provide advanced L2 technical support for roaming and interconnection incidents and coordinate L3 investigations and escalations through technical closure.
- Lead troubleshooting and Root Cause Analysis (RCA), correlating alarms, KPIs/KQIs, signaling traces, logs and customer impact.
- Coordinate end-to-end troubleshooting across Mobile Core, IMS, EPC/5GC, signaling, IPX, transport and visited networks.
- Monitor service health and roaming KPIs for voice, data, SMS, LTE, VoLTE, VoWiFi and 5G.
- Participate in Major Incident Management and coordinate technical recovery with internal teams, vendors and international operators.
- Identify recurring incidents and contribute to Problem Management, Known Errors and continuous improvement initiatives.
- Support service launches, interoperability testing, configuration validation and roaming partner activities.




- Develop runbooks, technical documentation, dashboards and automation initiatives to improve observability and reduce MTTR.
- Provide technical support to Commercial, Wholesale/Carrier Services, B2B and Customer Experience teams when required.

- Minimum 3 years of relevant telecommunications experience, with demonstrated experience in Roaming, Mobile Core, Service Assurance or advanced technical support.
- Hands-on experience troubleshooting mobile voice, data and SMS services, including signaling traces and logs.
- Solid understanding of LTE/EPC and VoLTE/IMS, with practical knowledge of technologies such as HLR/HSS, Diameter, SS7/SIGTRAN, SIP or DNS.
- Demonstrated experience performing technical RCA and coordinating complex incidents with multidisciplinary teams, vendors or international operators.
- Bachelor’s degree in Telecommunications, Electronics, Systems, Computer Science or related field, or equivalent professional experience.
- Advanced English required: minimum B2, C1 preferred, with the ability to conduct technical meetings, present findings and communicate with international partners and vendors.
- Strong ownership, analytical, communication and stakeholder-management skills.

📌 Roaming & Service Assurance Sr. Consultant (Ciudad de México)
🏢 Liberty Latin America
📍 Ciudad de México