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AST SpaceMobile is building the first and only global cellular broadband network in space to operate directly with standard, unmodified mobile devices based on our extensive IP and patent portfolio and designed for both commercial and government applications. Our engineers and space scientists are on a mission to eliminate the connectivity gaps faced by today’s five billion mobile subscribers and finally bring broadband to the billions who remain unconnected. Position Overview We are seeking a QA & Test Engineer to own product validation, verification, and quality engineering for all software delivered by our internal development teams. You will define and execute test strategies, design and build test cases and automated regression suites, manage test environments, track and drive defect resolution, and serve as the team’s formal authority on what has been proven to work before software ships. The right candidate brings solid software testing experience — ideally in a telecom, protocol stack, or network software context — combined with the technical depth to derive meaningful test cases from protocol specifications, ICDs, and architectural design documents. Key Responsibilities: Define, own, and maintain the overall test strategy for the internal software products Produce test plans for each major release and milestone, specifying scope, approach, entry and exit criteria, test types (functional, integration, regression, performance, end-to-end), and risk areas Execute manual and automated test cycles, document results rigorously, and provide clear pass/fail reports with supporting evidence Design and execute negative testing, boundary condition testing, protocol edge-case scenarios, and fault injection tests to validate system resilience, error handling, and graceful degradation across all product areas Develop and maintain the test tooling, test environments and simulation infrastructure needed to execute tests Integrate automated test suites into CI/CD pipelines and monitor test results, coverage trends, and flakiness over time, driving continuous improvement in automation reliability Maintain a living test documentation library: test plans, test cases, execution results, and release readiness assessments, kept current as software evolves across sprints and milestones Support post-deployment validation and smoke testing to confirm that released software operates correctly in production and staging network environments   Qualifications   Education: Bachelor’s degree in Computer Science, Software Engineering, Telecommunications Engineering, or a related technical field — or equivalent professional experience. Experience & Qualifications: A minimum of 4+ years of professional experience in software quality assurance and test engineering, with demonstrated experience testing complex, integration-heavy software systems. Experience testing telecom software, protocol stack implementations, or network elements is a plus. Proven ability to define test strategies, write detailed test plans, and design test cases from functional specifications, architectural design documents, and interface control documents (ICDs) Experience testing software against defined interface specifications or protocol standards; able to derive test cases from low-level technical documents such as ICDs, state machine diagrams, or 3GPP-style specifications Hands-on experience building and maintaining automated test suites using Python-based frameworks (pytest, Robot Framework, or equivalent); able to write clean, maintainable test automation code Experience designing and managing test environments, including stubs, mock services, and simulators, for testing networked software in isolation from live dependencies Disciplined approach to defect logging, triage, tracking, and verification using standard issue-tracking tools (Jira or equivalent) Experience in integrating au