Remote Mobile Core Network Engineer - Core CS/IMS

iTRTech Group; Portugal; On-site; EUR 18,972 - 22,320; Full time

Job summary

iTRTech Group offers a fully remote Core Computer Science Engineer role focused on Mobile Core Network platforms (CS/IMS) and voice services. You will support Core CS/IMS environments, analyse signalling and subscriber management, and collaborate with Operations, Engineering teams, and vendors to sustain service quality.

Fluency in Spanish and English is mandatory, with 3+ years in Mobile Core Network engineering.

Qualifications

• Degree in Telecommunications Engineering, Networking, Computer Science, or a related field.
• At least 3 years of experience in Mobile Core Network engineering, support, or operations.
• Hands-on experience supporting Core CS or IMS environments.
• Knowledge of voice, signalling, interconnection, or subscriber management services.
• Experience with Core Network platforms such as HLR, HSS, CUDB, UDM, UDR, AuC, EIR, or DNS.
• Knowledge of IMS and Voice Core components such as CSCF, MTAS, MGW, MGC, MRF, or Media Server.
• Experience with signalling protocols such as SS7, SIGTRAN, Diameter, or SIP.
• Experience troubleshooting complex Mobile Core Network incidents.
• Ability to perform technical analysis and identify root causes.
• Experience with Ericsson and/or Huawei Core Network platforms.
• Strong analytical, troubleshooting, and problem-solving skills.
• Ability to collaborate with Operations, Engineering teams, and vendors.
• Professional communication skills in Spanish and English.
• Ability to work effectively in a remote and international environment.

Responsibilities

• Support and maintain Core CS and IMS platforms.
• Ensure availability, stability, capacity, and performance of critical network services.
• Monitor and support voice, signalling, interconnection, and subscriber management services.
• Perform advanced troubleshooting and root cause analysis.
• Investigate complex technical incidents and recurring network issues.
• Analyse SS7, SIGTRAN, Diameter, and SIP signalling flows.
• Support software upgrades, patches, network changes, and maintenance activities.
• Coordinate technical activities with Operations, vendors, and engineering teams.
• Develop and maintain technical documentation and engineering guidelines.
• Identify opportunities to improve network resilience, performance, and operational efficiency.

Skills

Spanish

English

Education

Degree in Telecommunications Engineering/Networking/CS

Tools

HLR

HSS

CUDB

UDM

UDR

AuC

EIR

DNS

CSCF

MTAS

MGW

MGC

MRF

Media Server

Job description

iTRTech Group offers a fully remote Core Computer Science Engineer role focused on Mobile Core Network platforms (CS/IMS) and voice services. You will support Core CS/IMS environments, analyse signalling and subscriber management, and collaborate with Operations, Engineering teams, and vendors to sustain service quality.

Fluency in Spanish and English is mandatory, with 3+ years in Mobile Core Network engineering.