Core Engineer (Core Network Engineering team)

Requirements:

• 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