Senior IREG & Network Test Engineer

The world still has coverage blind spots. You could help eliminate them at Skylo.

Skylo has pioneered a standards-based approach to satellite connectivity. We connect smartphones and IoT devices directly to satellites. No special hardware no entirely new networks. Just billions of existing devices suddenly reachable anywhere on Earth. Were not building toward this future. Were already in it.

Our direct-to-device service is live on millions of activated devices across five continents covering more than 72 million square kilometers in partnership with leading satellite operators mobile network operators Tier-1 chipset makers and OEMs worldwide. And were just getting started.

At the heart of it all is Skylos commercial NTN vRAN: a 3GPP standards-based cloud-native platform that seamlessly bridges terrestrial and satellite networks. Its the infrastructure that makes true anywhere anytime connectivity possible.

When you join Skylo youll work at the intersection of three markets reshaping how the world stays connected: mass-market consumer devices automotive and industrial IoT. Enabling people outdoors and critical workflows in the worlds most remote places.

This is a rare chance to work on technology that matters at a company thats already proving it works

Every Mobile Network Operator (MNO) onboarding timeline ends at a critical technical test gate. We are hiring an automation-oriented Senior IREG & Network Test Engineer to own that gatefrom initial attach and authentication through SGd MAP SMS IP NIDD and roaming sign-off. You will replace manual partner-dependent execution with a repeatable test strategy a scalable testing environment and an automated regression pipeline.

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

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

• Optimize for NTN: Execute the standard GSMA-defined Roaming test suite while ideating and introducing custom validation test cases built specifically for NTN (Non-Terrestrial Networks).

• Build Automation Harnesses: Build and maintain an automation test harness and lab capable of running core GSMA and Skylo-specific routing scenarios consistently.

• Trace Analysis: Analyze Diameter/SS7 traces along with device and network logs to cleanly isolate configuration issues across Skylo IPX and MNO domains.

• Defect Management: Turn production and onboarding failures into repeatable regression test cases managing defects through root cause analysis remediation and retesting.

• Portfolio Metrics: Publish clear test coverage validation cycle-time defect rates and market-readiness dashboards for the onboarding leadership team.

• Cross-Functional Partnering: Coordinate closely with internal Signaling Routing Billing NOC and Product teams as well as external IPX vendors and MNO test squads.

• 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 with experience reading Wireshark traces to diagnose failures involving multiple external parties.

• Proven experience designing automated telecommunications testing frameworks using Python (or comparable languages) integrated 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.

With employees working across three continents Skylo is proud to be an equal opportunity employer dedicated to building an inclusive and diverse workforce. Our worldwide culture encourages a flexible approach to work and we offer an attractive range of benefits:

• Competitive compensation packages including a stock option-based equity program

• Comprehensive benefits including medical dental vision and retirement plan

• Monthly allowances for wellness and education reimbursement

• A generous time-off policy holidays and the opportunity to temporarily work abroad

• A once-in-a-career opportunity to operate the worlds first commercial live direct-to-device satellite network

• Access to a world-class team across software hardware chipsets telecom satellite and network virtualization

• Open transparent inclusive culture that blends Silicon Valley Nordic and South Asia characteristics.

The estimated base salary range for this role is:

• San Francisco CA: $155000 $165000

• Other US Locations: $135000 $145000

Within the range individual pay is determined by work location and additional factors including job-related skills experience and relevant training.

In addition to base salary Skylo offers a competitive benefits package including health insurance retirement plans paid time off and equity options.

Skylo is an equal-opportunity employer and we celebrate diversity. We do not discriminate based on race religion color ancestry national origin caste sex sexual orientation parent or caregiver status political affiliation gender gender identity or expression age disability medical condition pregnancy genetic makeup marital status or military service consistent with applicable federal state and local laws.

We are also committed to providing reasonable accommodations for qualified individuals with disabilities and disabled veterans in our job application procedures. Please let us know if you need assistance or accommodation due to a disability.

Required Experience:

Senior IC