Senior IREG & Network Test Engineer

Jobtailor; Espoo; On-site; EUR 70,000 - 100,000; Full time

Job summary

Jobtailor is seeking a skilled roaming validation professional to lead end-to-end testing of mobile core interconnects, Diameter routing, and NTN-related projects. You will design automated test frameworks, analyze network traces, and drive CI/CD integration for rapid validation.

The role focuses on GSMA roaming test suites, IREG testing, and interoperability with multiple MNOs, vendors, and labs to ensure robust onboarding readiness and high-quality releases.

Qualifications

• 5+ years in roaming validation, mobile core operations, interconnect routing, or telecom testing.
• Strong understanding of Diameter routing and S6a/S6d, SGd, roaming auth flows.
• Advanced protocol troubleshooting skills.
• Experience reading Wireshark traces for multi-party failures.
• Designing automated telecom testing frameworks using Python or similar.
• Experience CI/CD integration for testing.
• IR.21/RAEX data profiles, PLMN structures, IMSI records, and TADIG codes.
• NB-IoT, NTN satellite architectures, NIDD data paths, labs.

Responsibilities

• Define IREG test strategy, pass/fail metrics, network tracing protocols, and sign-off for each partner MNO.
• Run end-to-end roaming tests across registration, attach sequences, S6a/S6d, SGd, and IP/NIDD data paths.
• Execute the GSMA-defined Roaming test suite.
• Develop NTN-specific validation test cases.
• Build and maintain automation test harness and lab for GSMA/Skylo routing scenarios.
• Analyze Diameter/SS7 traces, device logs, and network logs to isolate configuration issues.
• Publish test coverage, validation cycle-time, defect rates and onboarding dashboards.

Skills

Roaming validation

Diameter routing

Automated testing

Protocol troubleshooting

Network log analysis

Tools

Jira

Confluence

Carrier-Grade Diagnostics

Job description

• Define the comprehensive IREG test strategy, pass/fail metrics, network tracing protocols, and official sign-off processes for each partner MNO


• Run end-to-end roaming testing across network registration, attach sequences, S6a/S6d authentication, SGd SMS-over-NAS, and IP/NIDD data paths


• Execute the standard GSMA-defined Roaming test suite


• Develop custom validation test cases specifically for NTN (Non-Terrestrial Networks)


• Build and maintain an automation test harness and lab for GSMA and Skylo-specific routing scenarios


• Analyze Diameter/SS7 traces, device logs, and network logs to isolate configuration issues across Skylo, IPX, and MNO domains


• Convert production and onboarding failures into repeatable regression test cases


• Manage defects through root cause analysis, remediation, and retesting


• Publish test coverage, validation cycle-time, defect rates, and market-readiness dashboards for onboarding leadership


• Coordinate with internal Signaling, Routing, Billing, NOC, and Product teams, external IPX vendors, and MNO test squads

Requirements

• 5+ years of hands‑on experience in roaming validation, mobile core operations, interconnect routing, IREG testing, or telecommunications network testing


• Strong understanding of Diameter routing and relevant SS7/MAP concepts, including S6a/S6d, SGd, and roaming authentication/registration flows


• Advanced protocol troubleshooting skills


• Experience reading Wireshark traces to diagnose failures involving multiple external parties


• Proven experience designing automated telecommunications testing frameworks using Python or comparable languages


• Experience integrating testing frameworks with modern CI/CD practices


• Complete fluency handling IR.21/RAEX data profiles, PLMN structures, IMSI records, and TADIG codes


• Practical experience with NB-IoT, NTN satellite architectures, NIDD data paths, or cellular device‑lab environments


• Familiarity with IMSI Tracing tools, carrier‑grade Diameter/SS7 diagnostic platforms, Jira, and Confluence


• Direct experience integrating network signaling validation with TAP/BCE billing verification

Core Competencies

Demonstrates expertise in roaming validation and telecommunications network testing, with a strong focus on Diameter routing, automated testing frameworks, and protocol troubleshooting. Proficient in managing defects and analyzing network logs to ensure optimal performance across mobile core operations.

Highest-signal resume keywords

• Roaming Validation


• Diameter Routing


• Automated Testing Frameworks


• Protocol Troubleshooting


• Network Log Analysis

ATS Optimization Keywords

Hard Skills

• IREG Testing


• Mobile Core Operations


• Interconnect Routing


• Advanced Protocol Troubleshooting


• Wireshark Traces Analysis


• Python Programming


• CI/CD Integration


• NB-IoT Experience


• IMSI Tracing


• TAP/BCE Billing Verification

Industry Keywords

• Telecommunications


• Non-Terrestrial Networks


• S6a/S6d Authentication


• SGd SMS-over-NAS


• NIDD Data Paths


• PLMN Structures


• IMSI Records


• TADIG Codes

Tools & Technologies

• Jira


• Confluence


• Carrier-Grade Diagnostic Platforms