Seeking a Senior System Test Engineer to join our Client's team. Senior System Test Engineer. Space Systems Test & Integration – MDSEA Support. Position Overview. Join the Space Systems Test & Integration team supporting the Missile Defense Space Enterprise Architecture (MDSEA). This role provides technical leadership for verification, validation, integration, and mission readiness activities across complex satellite ground system environments. The ideal candidate brings extensive hands-on experience with space-ground enterprise systems, mission system integration, IT infrastructure, automated testing, and Dev. Sec. Ops-aligned development pipelines. This position will work closely with multidisciplinary engineering teams, government stakeholders, and multiple vendors to support Developmental Test (DT) and Operational Test (OT) activities while ensuring mission-critical systems meet operational and cybersecurity requirements. Key Responsibilities. System Test & Integration. Develop and execute system-level test strategies, test plans, procedures, and verification artifacts. Lead verification, validation, integration, and mission readiness activities across enterprise satellite ground systems. Conduct:Functional testing. Integration testing. Regression testing. Performance testing. Cybersecurity testing. End-to-end mission system testing. Validate software builds, configuration changes, and modifications to enterprise ground system components. Support operational demonstrations, certification milestones, and readiness reviews. Technical Leadership. Provide technical guidance to MDSEA System Engineers to ensure:Test standardization. Performance target compliance. Mission readiness objectives. Lead defect triage efforts and root cause analysis for complex system issues. Coordinate issue resolution across multidisciplinary engineering teams. Provide senior-level technical leadership during integration events and operational milestones. Program & Stakeholder Coordination. Coordinate test activities across:Multiple vendors. Engineering teams. Agile development groups. Government stakeholders. Manage and maintain the Integrated Master Test Schedule (IMTS) for:DT/ OT events. Integration milestones. Readiness reviews. Prepare and deliver:Test reports. Readiness assessments. Risk summaries. Technical briefings for leadership and government customers. Infrastructure & Dev. Sec. Ops Support. Test and validate enterprise IT infrastructure, including:Servers.Networks. Storage systems. Virtualized environments. Mission-critical enterprise services. Design, develop, and maintain automated test scripts to improve test coverage and efficiency. Integrate automated testing into modern Dev. Sec. Ops CI/ CD pipelines. Support Infrastructure as Code (Ia. C) workflows through automated:Builds. Deployments. Integration processes. Ensure compliance with:Configuration management standards. Cybersecurity requirements. Test documentation quality standards. Required Qualifications. Extensive experience supporting satellite ground systems and enterprise mission environments. Strong background in system-level testing and integration activities. Experience with:Verification & Validation (V&V)DT/ OT test events. Enterprise infrastructure testing. Automated testing frameworks. Knowledge of Dev. Sec. Ops/ DevOps CI/ CD environments and Infrastructure as Code concepts. Experience coordinating across technical teams, vendors, and government stakeholders. Ability to troubleshoot complex system issues and lead root cause analysis efforts. Strong written and verbal communication skills with the ability to brief technical and non-technical stakeholders. Experience working in secure DoD or classified environments. Preferred Qualifications. Experience supporting Missile Defense, Space Systems, or National Security Space programs. Familiarity with Agile development environments. Experience supporting operational readiness reviews and certification events. Hands-on experience with enterprise virtualization, networking, and storage platforms. Knowledge of cybersecurity compliance requirements within DoD environments. Security Clearance Required: secret. Blackstone Talent Group is a wholly owned subsidiary of Blackstone Technology Group, a global IT services and software firm that implements technological solutions across commercial industry verticals and the US Federal Government. Blackstone's global talent augmentation practice was founded in 1998. Blackstone Talent Group has offices in San Francisco, Denver, Houston, Colorado Springs, and Washington, DC. We specialize in providing clients the best talent across a variety of industries and sectors.