Senior IREG & Network Test Engineer

Accountabilities

• • Define comprehensive IREG test strategies, including test cases, pass/fail criteria, network tracing procedures, validation metrics, and formal partner sign-off processes.
  • Execute end-to-end roaming validation covering network registration, attach sequences, authentication, S6a/S6d, SGd SMS-over-NAS, IP, and NIDD data paths.
  • Execute industry-standard roaming test suites while developing additional validation scenarios specifically designed for Non-Terrestrial Network (NTN) environments.
  • Build, maintain, and continuously improve automated testing harnesses and laboratory environments capable of executing core industry and network-specific routing scenarios consistently.
  • Analyze Diameter and SS7 traces, Wireshark captures, device logs, and network logs to isolate configuration and interoperability issues across internal, IPX, and MNO environments.
  • Convert onboarding and production failures into repeatable regression tests and manage defects through root cause analysis, remediation, validation, and retesting.
  • Develop and publish dashboards covering test coverage, validation cycle times, defect trends, and market-readiness metrics for technical and onboarding leadership.
  • Collaborate closely with signaling, routing, billing, NOC, and product teams, as well as external IPX providers and MNO testing teams, to coordinate technical validation and issue resolution.

  Requirements

  • 5+ years of hands-on experience in roaming validation, mobile core operations, interconnect routing, IREG testing, telecommunications network testing, or a closely related field.
  • Strong knowledge of Diameter routing and SS7/MAP concepts, including S6a/S6d, SGd, roaming authentication, and registration flows.
  • Advanced protocol troubleshooting capabilities, including extensive experience using Wireshark and network traces to diagnose complex failures involving multiple external parties.
  • Demonstrated experience designing and implementing automated telecommunications testing frameworks using Python or comparable programming languages.
  • Experience integrating automated testing into modern CI/CD environments and maintaining reliable, repeatable regression pipelines.
  • Strong knowledge of IR.21/RAEX data profiles, PLMN structures, IMSI records, and TADIG codes.
  • Strong analytical and problem-solving abilities, with excellent attention to detail when diagnosing complex network and signaling issues.
  • Effective communication and collaboration skills, with the ability to work across engineering, operations, product, and external partner teams.
  • Practical experience with NB-IoT, NTN satellite architectures, NIDD data paths, or cellular device laboratory environments is preferred.
  • Familiarity with IMSI tracing tools, carrier-grade Diameter/SS7 diagnostic platforms, Jira, and Confluence is a plus.
  • Experience connecting network signaling validation with TAP/BCE billing verification is preferred.

  Benefits

  • Competitive base salary of $155,000–$165,000 for San Francisco, CA locations.
  • Base salary of $135,000–$145,000 for other U.S. locations.
  • Stock option-based equity program.
  • Comprehensive medical, dental, and vision benefits.
  • Retirement plan.
  • Monthly wellness and education reimbursement allowances.
  • Generous paid time off and holiday policy.
  • Opportunity to temporarily work abroad.
  • Opportunity to work on a commercial direct-to-device satellite connectivity network.
  • Access to a multidisciplinary global team spanning software, hardware, chipsets, telecommunications, satellite systems, and network virtualization.
  • Flexible, open, transparent, and inclusive international work culture.
  • Equal employment opportunities and reasonable accommodation support for qualified individuals with disabilities and disabled veterans.