Senior Signaling & Routing Engineer (Telecom Core)

Skylo; Espoo; Hybrid; EUR 110,000 - 150,000; Full time

Benefits offered by this job

Competitive compensation packages

Occupational Healthcare and Health and

E-passi Wellness & culture benefits

Phone & Internet allowance

Learning & development budget

Job summary

Skylo in Espoo is seeking a highly technical Signaling and Routing Specialist to turn IR.21/RAEX profiles into production-ready Diameter connectivity. You will own the end-to-end interconnect design, configuration, testing, and handoff to operations, collaborating with IPX partners and MNO teams.

The role requires 10+ years in mobile-core signaling, strong Diameter and IREG experience, and hands-on DNS/IP coordination.

Qualifications

• 10+ years of hands-on experience in mobile-core signaling, roaming interconnect, telecom solutions engineering, or network operations.
• Deep technical Diameter experience, including DRA/DEA configuration, realm routing, peer management, and S6a/S6d/SGd protocols.
• Strong IP interconnect fundamentals, including DNS/ENUM, routing, security controls, and firewall/ACL coordination over IPX/GRX networks.
• Advanced protocol analysis skills with the ability to read Wireshark traces to diagnose signaling failures.
• Proven experience translating complex IR.21/RAEX data into operational configurations and executing structured IREG validation.
• A disciplined approach to change management, documentation, configuration integrity, and live production risk.

Responsibilities

• Routing Configuration: Design and configure Signaling, DRA/DEA routing, peers, connections, realms, Diameter identities, and GT mappings.
• Profile Translation: Translate IR.21/RAEX inputs into accurate, version-controlled operational configurations.
• IP & DNS Coordination: Plan interconnect IP addressing and coordinate DNS/ENUM, APN, realm resolution, firewall/ACL, and IPX peering changes.
• IREG Execution: Own end-to-end IREG-side testing for network registration, attach sequences, S6a/S6d authentication, SGd SMS, and NIDD where applicable.
• Trace Analysis: Analyze signaling traces (Wireshark) and resolve failures spanning Skylo, the IPX provider, and the partner MNO.
• Component-Level Isolation: Work with Skylo IPX partners and MNO IPX teams to isolate routing issues at component level.
• Standardization: Create LLD docs, change-control and peer-review processes for interconnections.
• Cross-Functional Partnering: Collaborate with Network Engineering, NOC, Security, Product, and external MNO teams through go-live.

Skills

Mobile-core signaling

Diameter protocol

Wireshark tracing

IP interconnect

IR.21/RAEX

S6a/S6d

Network debugging

Automation with Python

Tools

Wireshark

Job description

Skylo in Espoo is seeking a highly technical Signaling and Routing Specialist to turn IR.21/RAEX profiles into production-ready Diameter connectivity. You will own the end-to-end interconnect design, configuration, testing, and handoff to operations, collaborating with IPX partners and MNO teams.

The role requires 10+ years in mobile-core signaling, strong Diameter and IREG experience, and hands-on DNS/IP coordination.