Voice Engineer

First Point Group; Lisboa; Híbrido; EUR 40.000 - 60.000; Jornada completa

Descripción de la vacante

A leading technology recruitment agency is looking for an experienced Voice Core Engineer in Lisbon, Portugal. This role involves optimizing voice services and working with VoLTE architecture and signaling protocols in a hybrid work setup. The ideal candidate should have at least a BSc in Telecommunications and strong communication skills in both Portuguese and English. This position is under a contract until March 2026, with opportunities for ongoing engagement.

Formación

• Hands-on expertise in IMS and CS core networks.
• Experience working with telecom operators in customer-facing roles.
• Certifications from Ericsson, Huawei, Nokia, or Cisco are advantageous.

Responsabilidades

• Operate and maintain IMS/CS Voice Core network components.
• Analyze and troubleshoot IMS voice flows and procedures.
• Collaborate with cross-functional teams.

Conocimientos

VoLTE architecture

Signaling protocols

Core network nodes

Communication skills in Portuguese

Communication skills in English

Educación

BSc or MSc in Electronics, Telecommunications, or Computer Engineering

Herramientas

Huawei

Oracle

Ericsson

Mavenir

Nokia

Descripción del empleo

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Bridging Exceptional Talent with Leading Roles in Technology & Telecommunications

Location: Lisbon, Portugal

Work Setup: Hybrid – 2 days per week onsite

Start Date: ASAP

Contract Duration: Until March 2026 (with strong renewal history)

Role Overview:

We are seeking an experienced Voice Core Engineer with a strong background in IMS and CS core networks. The ideal candidate will have hands-on expertise in VoLTE architecture, signaling protocols, and core network nodes, and will play a key role in supporting and optimizing voice services.

Key Responsibilities:

• Operate and maintain IMS/CS Voice Core network components including SBC, x-CSCF, TAS, BGCF, MGCF, MRF, MGW, MSC, IMMGW.
• Analyze and troubleshoot IMS voice flows and procedures (e.g., VoLTE-VoLTE calls, TADS, Homing, Break-in/out calls).
• Understand and manage subscriber profiles in HSS/HLR and their impact on network behavior.
• Work with VoLTE-related protocols: SIP, Diameter, DNS, H248, Camel, RTP/RTCP.
• Support VoLTE/VoWiFi architecture and concepts.
• Collaborate with cross-functional teams and contribute to customer-facing engagements.

Preferred Experience:

• Familiarity with HSS, HLR, CuDB.
• Experience with signaling transfer elements (DRA, STP).
• Knowledge of DNS/ENUM and Number Portability (NP).
• Exposure to vendor technologies: Huawei, Oracle, Ericsson, Mavenir, Nokia.

Qualifications:

• BSc or MSc in Electronics, Telecommunications, or Computer Engineering.
• Certifications from Ericsson, Huawei, Nokia, or Cisco are advantageous.
• Strong communication skills in Portuguese and English.
• Proven ability to plan, prioritize, and work proactively in a team environment.
• Previous experience working with telecom operators in customer-facing roles.

Seniority level

Mid-Senior level

Employment type

Contract

Job function

Staffing and Recruiting