IMS Network Engineer
Set Europa
Madrid, Madrid, Spain
hace 2 días


Our client company is a growing global cloud software communication as a services platform company with a mission to connect every person and everything.

Customers use their services to energize their growth and profitability through their Global Software Defined Cloud and turnkey solutions, which feature relevant content, applications, and connectivity worldwide.

Technologies integrated into their cloud platform include the following : HPE, IBM, Ribbon Communications (Sonus+GenBand), NetNumber, Oracle, Microsoft, and other world class technology providers.

All relevant customer-acquired value is derived from the company's leading Global Software Defined Cloud, which delivers award-winning mobile enablement, regardless of the user's location or network.

By harnessing the value of communications, the company serves retail, enterprise, and IoT customers. They currenlty have offices in New York, Sao Paulo, Madrid, Barcelona, Indonesia, Bahrain, Belgium, Germany, Singapore, and the Netherlands.


As part of the Core Network Department and reporting to the Network Department Manager, your responsibility will be responsible for the design, deployment, configuration and maintenance of GSM / UMTS core network elements, such as GGSN, PGW, PCRF, DPI, DNS, RADIUS Servers, etc.

You will be responsible to handle incidents affecting the service we provide to our customers. Then, you will be responsible to drive the related problems resolution, down to problem correction.

You will be expected to be autonomous and self-driven in order to proactively fulfill your responsibilities. You will work collaboratively with other teams across the globe, the normal communication language being English.


  • Accountable and responsible for the IP Multimedia Core Network Subsystem (IMS) design and delivery.
  • Design and implementation of the IMS Core Network elements : CSCF, MTAS, SBG, DNS / ENUM, BGF and MRF, together with PGW and PCRF.
  • Accountable and responsible to follow the communications procedures in place when handling an incident. Communication is both internal within our company and external to our third-party providers.
  • Support management of the relevant mobile and IMS Core Network element vendors.
  • Responsible to drive problems to resolution, collaboratively working with the different divisions of the company.
  • Responsible for configuration and maintenance IMS core network elements.
  • Engineering support for commissioning, integration, system acceptance testing and lab testing for the IMS Core Network elements.
  • Perform IMS network monitoring and network capacity planning.
  • Ensure high availability through redundancy and failover mechanisms implementation.
  • Research and recommend new network technologies and upgrades to existing technologies to support business needs.
  • Documentation, training, and support of IMS network
  • Leadership in the design and planning of global expansion of the Carrier Platform
  • The ideal candidate will have at least 5 years’ experience, especially in GSM / UMTS / IMS network operations.

    Compulsory skills

  • Holding BSc degree in Telecommunication or Computer Science is a must requirement.
  • 5-10 years industry experience with Packet Core / IP Network, architecture, and protocols (3GPP GPRS / UMTS / LTE).
  • Strong knowledge and hands-on experience with testing / integration of LTE Core (MME / SGW / PGW), IMS Core and the associated network architecture / interfaces (CSCF, MTAS, SBG, DNS / ENUM, BGF, MRF, HSS, PGW, PCEF / PCRF, Accounting server, ).
  • Experience with IMS Core protocol and call flows of various interfaces such as Mw, Mx, Mj, Mg, ISC / Ma, Mp, Iq, Ix, Mb, Cx, Sh, Ut, Rx, Ro, DNS, CAMEL, S1-U, S6a, S2a, S6b, S11, Gx, and Gy.
  • Circuit switched communications protocols such as SS7 (including SCCP, TCAP, MAP), SCTP (SIGTRAN), Diameter, GTPv1, GTPv2).
  • Expert knowledge of IP infrastructure (Cisco certification preferred).
  • IMS voice convergence technologies, including VoLTE and VoWiFi.
  • Good understanding of Policy Control (PCEF, PCRF).
  • Hands on with sniffers, Wireshark and testing tools advanced mode.
  • Hands on with Linux / Unix based systems.
  • Understanding of 3GPP, ITU-T and ANSI standards.
  • Understanding of roaming agreements and IR.21, including IREG testing.
  • Online Charging System (OCS) and CAMEL in billing and call control.
  • Strong writing and documentation skills are needed to develop reports.
  • Adaptability and responding to change.
  • Be able to work under pressure.
  • You are fluent in English (written and spoken).
  • Ready to work on morning / afternoon shifts.
  • Experience with mobile networks, international signaling, and international interconnects a strong plus.
  • Valuable Assets

  • Experience on Ericsson IMS solution, IPWorks (DNS / ENUM) and EDA.
  • Experience on Ericsson NFVI to build the Cloud VoLTE solution.
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