Core Engineer (Core Network Engineering Team)

• 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
• 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.
• 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.

Responsibilities:

• 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.
• You will grow quickly into independent contributors

We offer:

• An exciting and challenging workplace with great skill and knowledge development opportunities.
• The opportunity to join a team of highly professional specialists in an international environment.
• The opportunity for professional development within a reputable international innovative and growing company.
• Salary level: 1400-1600 EUR gross per month
• Social benefits
• 200 EURO monthly Wolt food allowance
• Medical insurance
• Free mobile services with Tele2
• Car parking spot