Prototype Engineer (m/f/d) - EFT Mobility AG

This position is based at our subsidiary EFT Mobility AG , located in the center of Munich. You can find more information about EFT Mobility AG HERE .

At EFT Mobility , we are redefining the future of clean, high-performance autonomous flight with next-generation electric power systems tailored for Unmanned Aerial Vehicles (UAVs). Founded in 2019 in Munich by industry veterans from Tesla, BMW, and Siemens, our agile tech company merges deep-rooted expertise with a bold vision for innovation.

We develop batteries, chargers, and power distribution systems, specifically optimized for demanding UAV applications. Our focus is on delivering solutions that achieve industry-leading flight times, power delivery, and reliability. Operating in a fast-paced, startup environment, our highly skilled team thrives on short development cycles, turning groundbreaking ideas into deployed solutions.

We are seeking a versatile, fast-moving, and hands-on Prototype Engineer to lead our early-stage battery and power system development phase. In this role, you will be the bridge between a raw concept and a validated design. You will own the initial rapid prototyping cycle—building the very first physical proofs-of-concept, modifying existing architectures on the fly, and proving that an idea works before the broader development teams are deployed for series production. If you thrive in a dynamic, lab-focused environment where you can build, test, and iterate mission-critical power systems for demanding, real-world defense applications, this is your opportunity.

What is your Day-to-Day Mission

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Own initial prototype builds for operational validation: Take full responsibility for fabricating the first functional samples of next-generation battery and charger architectures—ranging from integrating novel battery cells into existing pack footprints to assembling initial bench-test proofs-of-concept for new charging systems—ensuring they are safe and ready for immediate flight and field testing.

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Execute prototype design and hardware modifications: Architect and build new power system prototypes from scratch by combining custom electro-mechanical layouts with existing internal building blocks, while also adapting legacy Battery Management Systems (BMS), electronics, and firmware configurations in close collaboration with core Engineering teams.

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Support scaling from proof-of-concept to small series: Provide core engineering design inputs for the next iteration of the battery pack and support the in-house assembly of small-series validation batches.

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Design manufacturing jigs: Conceptualize, design in CAD, and source/fabricate assembly fixtures needed for prototype assembly

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Manage prototyping machinery: Maintain full ownership of the in-house assembly lab equipment, including adhesives and dispensing systems, laser welding setups, 3D printers and Begin-of-Line (BOL) / End-of-Line (EOL) electrical test benches.

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Supervise assembly execution: Guide and collaborate directly with a dedicated workshop technician to execute physical builds safely and efficiently.

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Document and report learnings: Actively close the loop with internal Mechanical Engineering, Electrical Engineering, and Firmware design teams by translating early build learnings, tolerance issues, or mechanical interferences into actionable design improvements.