Senior IREG & Network Test Engineer

Skylo

Senior IREG engineer automating roaming validation for Skylo’s live direct-to-device satellite connectivity platform. Building NTN test frameworks, analyzing network traces, and driving MNO onboarding sign-off.

Posted 8/20/2026full-timeEspoo • 🇫🇮 FinlandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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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 ValidationDiameter RoutingAutomated Testing FrameworksProtocol TroubleshootingNetwork Log Analysis

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

IREG TestingMobile Core OperationsInterconnect RoutingAdvanced Protocol TroubleshootingWireshark Traces AnalysisPython ProgrammingCI/CD IntegrationNB-IoT ExperienceIMSI TracingTAP/BCE Billing Verification

Tools & Technologies

JiraConfluenceCarrier-Grade Diagnostic Platforms

Industry Keywords

TelecommunicationsNon-Terrestrial NetworksS6a/S6d AuthenticationSGd SMS-over-NASNIDD Data PathsPLMN StructuresIMSI RecordsTADIG Codes

Tech Stack

Tools & technologies

IoTPython

About the role

Key responsibilities & impact

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

What you’ll need

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

Benefits

Comp & perks

Competitive compensation packages
Occupational Healthcare and Health and Life Insurance
E-passi including, wellness, culture, lunch and commuting benefit
Phone & Internet allowance
Individual learning & development budget for further personal and professional development
Flexible approach to work
Inclusive and diverse workplace culture