Voice Engineer Lisboa

Voice Engineer
Lisboa
Lisboa, Lisboa, Portugal

Voice Core Engineer – Lisbon (Hybrid)
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
- on expertise in Vo
LTE 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,
- CSCF, TAS, BGCF, MGCF, MRF, MGW, MSC, IMMGW.
Analyze and troubleshoot IMS voice flows and procedures (e. g. , Vo
LTE-Vo
LTE calls, TADS, Homing, Break-in/out calls).
Understand and manage subscriber profiles in HSS/HLR and their impact on network behavior.
Work with Vo
LTE-related protocols: SIP, Diameter, DNS, H248, Camel, RTP/RTCP.
Support Vo
LTE/Vo
Wi
Fi architecture and concepts.
Collaborate with
- functional teams and contribute to
- facing engagements.
Preferred Experience:
Familiarity with HSS, HLR, Cu
DB.
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
- facing roles.