Core Engineer
Core Engineer at Webbing; hands-on core network work across 3G/4G/5G, on-call.
Description: 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
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- Design, scale, and integrate a network element into a live network
- Lead integrations and projects on a live production network
- Own tickets end-to-end
- Troubleshoot real network issues across 3G/4G/5G Standalone
- Work with monitoring tools
- Be an independent contributor
- Collaborate with global teams
- On-call duty 24x7
- 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
- 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
| Location | Active listings |
|---|---|
| Finland | 6 |
| Remote - Global | 1 |
| Role type | Active listings |
|---|---|
| Database Engineer | 2 |
| Core Engineer | 1 |
| Workflow & Provisioning | 1 |
| Workflow Developer and Tester | 1 |
| Workflow Developer | 1 |
| Workflow Engineer | 1 |
| Role level | Active listings |
|---|---|
| Senior | 5 |
| Mid-Level | 2 |
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