Spacecraft Functional Test Engineer III

Firefly Aerospace•Cedar Park, TX

4d•Onsite

About The Position

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.

Requirements

Bachelor’s degree in Electrical, Mechanical, Aerospace, Computer Engineering, or related field.
6+ years of experience in aerospace, electromechanical systems, or test environments (internships, co-ops, or significant academic projects count).
Exposure to functional or system-level testing through coursework, research, or internships.
Familiarity with scripting languages such as Python, C++, or similar.
Basic understanding of hardware/software interfaces and data acquisition systems.
Strong analytical and problem-solving skills.
Ability to work effectively in a collaborative, fast-paced environment.

Nice To Haves

Exposure to Hardware-in-the-Loop (HWIL) systems or simulation environments.
Experience with data visualization or basic analytics tools.
Familiarity with version control systems (e.g., Git).
Exposure to environmental testing or hardware integration environments.

Responsibilities

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.