Core Engineer
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Job Description
Core Engineer operating Webbing’s global MVNO mobile core across roaming, 5G-SA, and live production networks. Troubleshooting incidents and leading network integrations end to end.
Responsibilities:
- Join Webbing's Core Network Engineering team
- Work hands-on with live mobile core infrastructure spanning global roaming, MVNO operations, and an active 5G-SA roadmap
- Troubleshoot real network issues across 3G, 4G, and 5G Standalone
- Own tickets end-to-end
- Lead integrations and projects on a live production network
- Design, scale, and integrate network elements into a live network
- Participate in network element integrations
- Work with monitoring tools
- Provide 24x7 on-call support
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
- Knowledge of GTP-C / GTP-U, CUPS, bearer lifecycle, session management, and data plane flows
- Knowledge of Diameter & Radius, including routing, realms, application IDs (Gx, Gy, S6a), and AAA flows
- Hands-on or advanced lab experience with 5G-SA architecture: AMF, SMF, UPF, NRF, and PCF
- Strong understanding of GRX routing and IPX interconnect operations
- Understanding of roaming processes and procedures: IR.21, IPX, and GRX operations
- Hands-on experience with PGW configuration, troubleshooting, and session management
- Hands-on experience with PCRF, Gx interface, and policy management
- Hands-on experience with GTP Proxy, GTP-C interception, and roaming traffic steering
- Experience with Diameter routing configuration, signaling troubleshooting, and analyzing Diameter flows
- Experience with Radius AAA flows, authentication, accounting troubleshooting, and analyzing Radius
- Experience working with monitoring tools
- Ability to design, scale, and integrate a network element into a live network
- Hands-on experience integrating network elements
- Familiarity with APIs and basic scripting, such as Python or similar
- At least 3 years of practical experience as a core engineer
- Ability to perform 24x7 on-call duty
- Team player
Benefits:
- 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.
- Meal Vouchers.
- Medical insurance.
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