Spacecraft Functional Test Engineer III

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Firefly Aerospace is a space and defense technology company that enables our world to launch, land, and operate in space – anywhere, anytime. As the partner of choice for critical space missions, Firefly is the only commercial company to launch a satellite to orbit with 24-hour notice and the only company to achieve a successful Moon landing. Our launch vehicles, lunar landers, and orbital vehicles provide government and commercial customers with full mission services from low Earth orbit to the Moon and beyond.

Headquartered in north Austin, Texas, Firefly is looking for passionate, hardworking innovators to join our team and help fuel our successful trajectory into space.

We are seeking a Spacecraft Functional Test Engineer III to join our Assembly, Test and Launch Operations (ATLO) organization and play a key role in verifying spacecraft performance from integration through launch. As part of the spacecraft test team, you will develop and execute functional test campaigns that validate system and subsystem performance, ensuring each vehicle is flight-ready. This is a hands‑on, highly cross‑functional role that blends test architecture design, software‑driven test execution, and real‑time problem solving during vehicle integration and environmental testing.

You’ll work closely with subsystem design teams to define test requirements, develop test scripts and procedures, and build automation that enables repeatable, high‑throughput testing across multiple spacecraft programs. This position is ideal for engineers who thrive in dynamic environments, enjoy working across hardware and software boundaries, and are passionate about building reliable spacecraft through disciplined testing.

As a Spacecraft Functional Test Engineer, you will:

• Develop and execute spacecraft functional and system‑level test procedures to verify vehicle performance and mission readiness.
• Design and maintain automated test scripts, configurations, and architectures to support efficient test execution across multiple programs.
• Collaborate with subsystem responsible engineers and chief engineers to define test requirements and ensure traceability to verification objectives.
• Support Hardware‑in‑the‑Loop (HWIL) testbed development and maintenance, including defining configurations and integrating hardware/software interfaces.
• Monitor and troubleshoot test results, identifying issues and driving root cause resolution across subsystems.
• Plan and support test operations in cleanroom, environmental, and launch site environments.
• Contribute to data management, telemetry visualization, and results analysis to ensure comprehensive verification and documentation.
• Participate in continuous improvement efforts to streamline test processes, increase automation, and enhance test reliability.
• Support the development of tools, dashboards, and analytics for test performance tracking and data‑driven decision making.

Basic

• Bachelor’s degree in Electrical, Mechanical, Aerospace, Computer Engineering, or related field.
• 5+ years of experience in spacecraft, aerospace, or complex electromechanical system test environments.
• Hands‑on experience developing or executing functional or system‑level test procedures.
• Familiarity with test automation frameworks and scripting languages (e.g., Python, C++, or similar).
• Working knowledge of hardware/software interfaces, data acquisition, and telemetry systems.
• Strong analytical and troubleshooting skills with the ability to work across multiple engineering disciplines.
• Ability to work effectively in a fast‑paced, collaborative environment supporting multiple spacecraft programs.
• Experience with spacecraft‑level testing, including power‑on, system checkout, and mission simulation campaigns.
• Familiarity with Hardware‑in‑the‑Loop (HWIL) systems, EGSE design, or simulation environments.
• Experienc…