Senior System Test Engineer

Skylo Technologies•Mountain View, CA

2d•Hybrid

About The Position

Skylo is seeking a highly skilled System Test Engineer to design and execute quality assurance strategies for Skylo’s end-to-end satellite Non-Terrestrial Network (NTN). This role will focus on ensuring system reliability, performance, and compliance with 3GPP standards across device, radio access, and core network layers. The engineer will be responsible for test planning, execution, and analysis to validate network features, field deployments, and customer-facing services. Skylo has pioneered a standards-based approach to satellite connectivity, connecting smartphones and IoT devices directly to satellites without special hardware or new networks. Their direct-to-device service is live on millions of activated devices across five continents. At the heart of it all is Skylo's commercial NTN vRAN: a 3GPP standards-based, cloud-native platform that seamlessly bridges terrestrial and satellite networks. This role is located in Mountain View, CA, with an onsite requirement of 3 days a week in the office.

Requirements

Proven track record in system test or validation engineering or acceptance testing for large-scale, distributed, or telecommunications systems.
Strong understanding of 3GPP cellular protocols (LTE/ 5G/ NBIOT-NTN), with a strong emphasis on RAN and Core Network components.
Strong understanding of QA processes - from defining acceptance criteria to requirements to test suites
Hands-on experience with system integration, performance benchmarking, and end-to-end validation.
Hands-on experience with load testing, chaos testing, fault injection, efficiency testing
Hands-on experience with protocol validation, device testing (using AT commands and otherwise), UE emulators
Familiarity with RESTful APIs for testing using tools such as Postman, along with gRPC APIs
Ability to script and/or program in either Bash, Python, Go, Ruby on a Unix/Linux or equivalent program and to execute automation jobs using Jenkins
Strong troubleshooting, root-cause analysis, and problem-solving skills.
Ability to thrive in a fast-paced, execution-driven environment with minimal oversight.
Excellent communication skills for cross-functional collaboration.
Every role at Skylo uses AI tools daily to amplify output. We expect active habits using AI tools and a track record of folding new ones into your workflow quickly

Nice To Haves

Experience with satellite or NTN systems, including LEO/MEO/GEO connectivity.
Familiarity with RF testing methodologies, lab equipment, and field measurement tools.
Exposure to cloud-based infrastructure and virtualized test environments.
Advanced degree in Electrical Engineering, Telecommunications, Computer Science, or related discipline.
Hands-on experience using JIRA & Confluence
Experience with designing and building test automation frameworks using Robot Framework and Python
Experience leading system validation projects or mentoring junior engineers.

Responsibilities

Develop and execute comprehensive test plans to validate Skylo’s NTN system functionality, scalability, and performance - from understanding requirements, to defining test plans to execution to automation
Collaborate with system architects, software developers, and network engineers to define test strategies for new features and releases.
Conduct integration, interoperability, and regression testing across device, RAN, core network, and satellite segments.
Perform lab-based and field-based testing to validate performance under real-world conditions.
Analyze and debug complex system issues, identifying root causes across hardware, software, and network layers.
Define KPIs, collect telemetry, and assess observability tools for ongoing system validation.
Document test results, provide clear feedback to development teams, and drive resolution of issues.
Actively participate in test automation, enhancing test coverage for different test categories
Mentor junior engineers and contribute to best practices in system validation methodologies and processes.