Core Engineer

You will join the Core Network Engineering team at Webbing, working hands-on with our live mobile core infrastructure spanning global roaming, MVNO operations, and an active 5G-SA roadmap.

The role is technical and operational. You will troubleshoot real network issues across 3G, 4G, and 5G Standalone, own tickets end-to-end, and lead integrations and projects on a live production network.

We are a focused team that moves fast and takes full ownership of activities end to end.

Engineers here are expected to grow quickly into independent contributors

• Deep understanding of MNO/MVNO architecture and end-to-end GTP flow design

• Complete familiarity with 3GPP standards across 2G/3G/4G and 5G, including:

• GTP-C / GTP-U, CUPS - bearer lifecycle, session management, data plane flows

• Diameter & Radius - routing, realms, application IDs (Gx, Gy, S6a), AAA flows

• 5G-SA architecture - AMF, SMF, UPF, NRF, PCF — hands-on or advanced lab experience

• Strong understanding of GRX routing and IPX interconnect operations

• Understanding of roaming processes and procedures: IR.21,IPX, and GRX operations

• Hands-on experience

• ◦ PGW - configuration, troubleshooting, session management

• ◦ PCRF- Gx interface, policy management

• ◦ GTP Proxy - GTP-C interception, roaming traffic steering

• Diameter - routing configuration, signaling troubleshooting, experience analyzing Diameter flows.

• Radius - AAA flows, authentication, and accounting troubleshooting, experience analyzing Radius.

• Understanding of roaming processes and procedures (IR.21, familiarity with IPX and GRX operations).

• Working with monitoring tools

Our engineer should have the following skills:

• Ability to design, scale, and integrate a network element into a live network.

• Hands-on experience in integration between network elements.

• Comfortable working under pressure during live network incidents

• At least 3 years of practical experience as a core engineer.

• Familiar with APIs and basic scripting (Python or similar).

• 24x7 On-call duty.

• Team player