Shield AI is a venture-backed defense-tech company with the mission of protecting service members and civilians with intelligent systems. Its products include Hivemind autonomy software, V-BAT and X-BAT aircraft, and Aechelon simulation and synthetic reality technologies. Europe, the Middle East, and Asia-Pacific, Shield AI's technology actively supports operations worldwide. Shield AI develops AI-powered autonomy software and aircraft systems that protect service members and civilians by enabling intelligent operations in contested environments. Shield AI is seeking a Lead Mechanical Engineer, Hardware Test to lead the design and development of mechanical test infrastructure that enables rapid, rigorous validation of X-BAT hardware. This role will own the mechanical side of hardware testing, from concept through deployment, by building robust test stands, fixtures, and support equipment for engineering and production-level test activities. The adecuado candidate is a strong technical leader who can manage a small team, establish sound engineering processes, and drive execution in a fast-paced hardware environment. Success in this role requires hands-on experience with mechanical design, fixture development, analysis, fabrication support, and cross-functional coordination in support of complex aerospace hardware test programs. Lead a team of mechanical engineers in designing, building, and maintaining X-BAT hardware test stands and fixtures that support subsystem, integration, and qualification testing. Perform core people-lead responsibilities, including work planning, technical direction, regular 1:1s, coaching, feedback,



and performance development for the team. Own requirements gathering, concept development, detailed design, and validation of multiple test stands used to evaluate X-BAT hardware and supporting subsystems. Design fixtures, tooling, structural support hardware, and mechanical systems for engineering and production-level test applications. Perform mechanical analyses such as hand calculations and FEA-informed assessments for strength, stiffness, thermal behavior, durability, and safety. Define and apply industry-standard mechanical engineering practices, including GD&T;, tolerance analysis, DFM/DFA, design reviews, release documentation, and configuration discipline. Partner with test, electrical, avionics, manufacturing, and technician teams to integrate test hardware that is safe, repeatable, maintainable, and efficient to operate.
Drive troubleshooting and root-cause investigations when test hardware or units under test do not perform as expected and implement corrective design improvements. Build team processes, documentation habits, and execution rhythms that improve quality, speed, and ownership across the hardware test function. S. in Mechanical Engineering or a related STEM discipline; Proven experience as a senior or lead mechanical engineer developing fixtures, tooling,



or test stands for aerospace, defense, robotics, or other complex hardware systems.
Prior experience leading engineers and building high-performing teams, including mentoring, setting expectations, and driving accountability. Strong mechanical design fundamentals with the ability to take concepts through analysis, detailed design, fabrication, assembly, and checkout. Proficiency with industry-standard CAD tools such as NX, SolidWorks, or CATIA, and experience releasing drawings for manufacture. Excellent communication skills and the ability to work across disciplines to translate ambiguous test needs into robust mechanical solutions. Experience with propulsion or engine-related test equipment, high-load structural fixtures, or mechanically complex aerospace ground test systems. Familiarity with environmental or qualification testing and the facility interfaces those systems require, such as mounting, cooling, plumbing, or instrumentation accommodations. Experience using analysis tools such as ANSYS, Abaqus, or Nastran to support test hardware design decisions. Comfort working directly with technicians, machine shops, and test operators to refine designs and improve ease of use in the lab. Full-time regular employee offer package: Temporary employee offer package: Pay within range listed above + temporary benefits package (applicable after 60 days of employment) If you have a disability or special need that requires accommodation, please let us know. If you would like more information about how your data is processed, please contact us.

📌 Lead Mechanical Engineer, Hardware Test (Madrid)
🏢 shieldai
📍 Madrid