We are looking for a skilled and analytical Test Engineer (m/f/d) to drive system-level validation of our Battery Energy Storage Systems (BESS).
You will help build the foundation of our testing function by defining processes, infrastructure, and tools as production scales. The role focuses on validating complete BESS and key subsystems to ensure functionality, reliability, and safe integration of mechanical, electrical, and software components. Additional tasks may include ECAD support, PLC logic implementation, and development of EoL/FAT tooling.
Plan, execute, and document system- and subsystem-level BESS tests.
Verify integration of electrical, software, thermal, and safety systems.
Conduct functional, performance, and regression tests.
Analyze deviations and support troubleshooting and root-cause investigations.
Develop scalable test procedures and contribute to the long-term testing roadmap.
Help establish internal testing processes, standards, and tooling.
Support definition of future testing infrastructure and methodologies.
Enable knowledge transfer and, over time, support additional testing staff.
Maintain accurate test documentation and traceability.
Support CE/EMC and other certification-related tests.
Provide structured feedback to engineering teams for continuous improvement.
ECAD Support: Assist with wiring diagrams, component integration, and prototype electrical reviews.
PLC Programming: Support PLC logic implementation and communication/I/O configuration.
EoL/FAT Tooling: Contribute to automated test processes, device integration, and reporting.
Degree in Electrical Engineering, Mechatronics, or similar.
Experience in testing, validation, commissioning, or troubleshooting complex systems.
Strong understanding of industrial electrical systems, safety, and system integration.
Practical skills in PLC programming and/or Python.
Strong analytical, documentation, and problem-solving skills.
Optional: Experience with BESS, ECAD tools (e.g., EPLAN) and/or PLC systems (ideally WAGO).
Methodical, structured, detail-oriented working style.
Hands-on mindset and comfort with prototypes and hardware.
Strong communication and cross-functional collaboration skills.
Proactive and process-oriented, with interest in shaping a growing testing function.
STABL Energy is one of the most innovative start-ups in the energy transition, ees Award winner and named a global Top100 Energy Start-up. We are funded by renowned and experienced Tech VCs from Germany, Denmark and Switzerland.
What you’ll love about working with us:
We make energy storage stable and secure the future of energy. As technological pioneers, we develop storage solutions that extend battery life cycles and encourage the sustainable use of resources. Our approach is simple: we never recycle a battery too soon. STABL Energy is more than just a traditional start-up company. Ready to be part of us, innovate, impact, and inspire?
Test Engineer BESS mfd • München, Bayern, DE