Voice Core (IMS/CS) Engineer

CELFINET is a global provider of unique cellular networks’ management solutions. With a fast pace growing business, we are reinforcing our CORE team!

What you’ll be doing:

Voice Core network (IMS/CS) 3-year experienced engineer;
Experience working with IMS Voice/VoLTE core nodes such as SBC, x-CSCF, TAS (MMTel-AS, SCC-AS, IP-SM-GW, IM-SSF), BGCF, MGCF, and MRF;
Experience working with CS Voice/VoLTE core nodes such as: MGW, MSC, MGCF, IM-MGW;
Experience analyzing IMS voice-related flows and procedures (e.g., VoLTE-VoLTE call, T-ADS, Homing, Break-in call, Break-out call);
Knowledge of the parameters that compose the subscriber’s profile in HSS/HLR and their impacts on the network behavior;
Comfortable with VoLTE-related protocols (e.g., SIP, Diameter, DNS, H248, Camel, RTP/RTCP);
Comfortable with VoLTE/VoWifi concepts and architecture;
Preferable: experience with virtualized environments (NFV/SDN, Containers, Kubernetes, etc.).
Preferable: experience with signaling transfer elements (e.g., DRA, STP)
Preferable: experience with DNS/ENUM and Number Portability (NP);
Preferable: experience with HSS, HLR and CuDB;
Preferable vendors: Ericsson/ Mavenir/ Nokia/ Huawei;

We’d like to meet someone with:

Electronics/Telecommunications/Computer Engineering BSc or MSc degree;
Certifications from Ericsson, Huawei, Nokia, or Cisco are a plus;
Location: Portugal, Lisbon
Customer facing experience in Telecom operators
Excellent verbal and written communication skills (Portuguese and English)
Ability to plan, organize and prioritize the responsibilities.
Good team player and with highly proactive skills;
Flexibility to travel and work in international projects;

What we have to offer:

Full time employment and competitive salary package;
Unique opportunity to work in an international company;
Be part of a highly skilled technology-driven team, eager to lead through creativity and innovation;
The opportunity to work in challenging projects with the most demanding and technologically advanced telecom operators in the world;
Access to the most recent technologies and methodologies;
Knowledge-sharing corporate culture;
Great workplace environment!

CELFINET offers its employees a comprehensive compensation package and the opportunity to work in a uniquely challenging environment within a highly motivated team. Submit today your application if you are the candidate we are looking for!