Senior IREG & Network Test Engineer

Own the IREG Testing Strategy: Define the roadmap for MNO onboarding—including clear pass/fail criteria, evidence requirements, and sign-off processes—so we can scale our roaming partnerships faster and more reliably.

Drive Testing Innovation: Look beyond manual execution to build a long-term automation strategy that makes our roaming validation smarter, faster, and eventually hands-free.

Adapt Standards for Space: Take standard GSMA roaming test suites and figure out what’s missing for Non-Terrestrial Networks (NTN), designing new edge-case tests that bridge the gap between terrestrial and satellite.

Build the Testing Lab: Design, scale, and maintain an automation harness capable of reliably running both standard GSMA and custom NB-IoT NTN scenarios.

Ensure End-to-End Interoperability: Validate the entire roaming journey (Registration, S6a/S6d, SGd, IP, NIDD), ensuring smooth handoffs across satellite and cellular networks.

Translate Complex Tech into Test Cases: Build comprehensive test scenarios by combining GSMA standards, partner network configurations, and our unique NB-IoT NTN traffic profiles.

Troubleshoot Across Borders: Dig into Diameter/SS7 traces and network logs to isolate and resolve complex routing or signaling issues happening anywhere between our network, the IPX, and the MNOs.

Learn from Real-World Friction: Turn production snags and onboarding hiccups into automated regression tests to ensure we continuously improve and never fix the same bug twice.

Act as the Subject Matter Expert: Use your deep knowledge of 3GPP protocols (LTE/5G/NB-IoT NTN) and RAN/Core networks to guide engineering and product teams on technical decisions.

Own the Defect Lifecycle: Don't just log bugs—track them down to the root cause, partner with engineering on the fix, and see them through to complete closure.

Keep Leadership Informed: Build and share clear dashboards covering test cycle times, defect rates, and overall readiness so the business always knows where MNO onboarding stands.

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• Collaborate Across Boundaries: Work hand-in-hand with internal teams (Signaling, Billing, NOC, Product) and external partners (IPX, MNOs) to get new networks launched smoothly.

5+ years of experience in roaming, mobile core, interconnect, IREG, or telecommunications network testing.

Hands-on understanding of Diameter and relevant SS7/MAP concepts, including S6a/S6d, SGd, and roaming authentication and registration flows.

reading Wireshark or equivalent signalling traces and diagnosing network failures involving multiple parties.

designing automated telecommunications testing frameworks using Python or comparable languages and CI practices.

Fluency with IR.21/RAEX, PLMN, IMSI, TADIG, and structured testing evidence.

NB-IoT, NTN, NIDD, IoT roaming, GSMA test-suite, or device-lab experience.

Familiarity with IMSI Tracing, Diameter/SS7 testing tools, Jira, Confluence, and dashboarding.

integrating network testing with TAP and billing validation.

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 world's 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: $155,000 — $165,000

Other US Locations: $135,000 — $145,000

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.