Senior Engineer, Core Network

General Application Questions (Engineering)

Are you comfortable working in a remote environment? ✱

What are your salary expectations (EUR, p.a., gross)? ✱

Do you now, or in the future, require any sort of visa support? ✱

• Yes
• No

Are you based in Spain or UK? ✱

• Yes
• No

Which of the following best describes most of your experience? ✱

• I’ve been a Lead/Senior Engineer in a Tier 1 Carrier or Major NEP, managing massive subscriber scale.
• I’ve worked in a high-growth MVNO or MVNE environment, building flexible and agile core services.
• I’ve worked in smaller private networks or enterprise environments.
• None of the above

When a critical roaming connection fails, where do you start your "detective work"? (Select the interfaces/protocols you are most comfortable decoding in a live trace).

• Decoding ULR/ULA and Authentication flows on S6a.
• Troubleshooting GTP-C/GTP-U procedures on S5/S8 or S11.
• Debugging Gx or Gy Diameter interfaces to resolve quota or QoS issues.
• Managing flows across Iu-PS (3G) or EN-DC (5G NSA) signaling.

We believe that "it’s always DNS" when it comes to global node discovery. Have you had primary responsibility for architecting any of the following? (Select all that apply).

• Designing S-NAPTR records for MME/SGSN to discover PGW/SGW nodes.
• Managing ASN assignments and BGP peering for international roaming.
• Designing HSS/UDM profiles and APN configurations for specialized services (like IoT or IMS).
• Implementing CUPS (Control and User Plane Separation) or Cloud-Native functions.

Yes, Airalo can contact me about future job opportunities for up to 1 year
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