Joby Aviation is seeking a passionate, motivated and hands-on Senior Test Engineer on the Energy Storage and Distribution System (ESDS) Test Team to lead characterization, performance, environmental and reliability testing of the high-voltage electronics within the ESDS, including power distribution units, power conversion electronics (DC/DC converters), battery management system (BMS) hardware, contactors, fuses, current/voltage sensing circuits, and related PCBs. This role is a member of the Powertrain & Electronics Testing Team and leads the verification and validation testing activities for flight-critical HV electronics, with specific emphasis on electrical stress and abuse testing, HV insulation and isolation verification, electrical-thermal cycling, and Electromagnetic Effects testing (such as EMI/EMC, HIRF, and lightning-induced transients).

Test preparation includes:

• Test engineering: Identify test objective(s), collaborate with electrical design engineers and system engineers to devise test matrices, instrumentation and measurement needs (voltage/current sensing, isolation monitoring, high-speed transient capture), and outline detailed test procedures such that results are repeatable and consistent
• Test article: Coordinate appropriate and configuration-controlled HV electronics test articles, power distribution and conversion hardware, BMS boards, contactors, fuses, special connectors, and PCBs, to meet test objective(s)
• Test equipment: Work closely with Test Equipment Design Engineers to have custom HV test rigs, battery emulators/cyclers, and programmable load setups built, assembled, operated, and maintained; define electrical requirements and expectations of the test stand/test setup, including HV interlocks, isolation barriers, and grounding/bonding schemes
• Lab integration: Aid in the integration and maintenance of various ESDS labs, including a complete aircraft representative battery lab and power distribution, power conversion, and BMS electronics labs, while strictly adhering to HV safety best practices, proper documentation, and safety awareness

Test execution includes:

• Perform electrical characterization, qualification, and reliability testing of ESDS HV electronics, including dielectric withstand (hipot), insulation resistance, contactor switching and fault-current interruption, bus transient/inrush characterization, and power/thermal cycling, plus environmental stress testing (thermal/humidity cycling, vibration and shock, accelerated life, and EMI/EMC, HIRF, and lightning effects)
• Work closely with System Engineers on battery pack-level verification and validation, including electrical acceptance tests on aircraft representative packs with Safety-of-Flight documentation, evaluation of BMS functional behavior and battery algorithms (SoC, SoE, etc.), and validation of protection functions
• Analyze electrical test data (waveforms, power quality, thermal-electrical performance) to generate reports that give design teams quantifiable feedback for design optimization and certification compliance; perform root cause investigation and failure analysis of HV electronics, documenting findings for corrective action
• Coordinate and lead test kickoff, test readiness, and data review meetings; work with the Test Program Manager to plan work, schedule test resources, report progress, and ensure tests are properly documented and closed out
• Work closely with Design Engineers, System Engineers, DERs, and Certification Engineers to verify ESDS HV electronics meet design requirements; author Qualification Test Plans and Procedures (QTP) and balance iterative R&D testing with formal FAA witnessed Qualification testing
• Aid in the incremental automation of pack, and BMS, functional electrical test setups while applying deep knowledge of HV safety threats, lockout/tagout, and prevention best practices

• B.S. in Electrical Engineering or relevant discipline with 5+ years of work experience in a relevant industry performing Test Engineering activities on high-voltage electronics or battery systems, OR Advanced degsree and 3+ years of experience
• Experience testing high-voltage, high-power electronics (such as power distribution units, DC/DC converters, contactors, fuses, and protection circuits) in electric vehicle, aerospace, or similar applications
• Practical experience with HV electrical test methods including dielectric withstand (hipot), insulation resistance, isolation monitoring, and high-current/transient measurements
• Practical experience using lab equipment such as oscilloscopes (including HV differential probes and current probes), data acquisition systems, power analyzers, programmable power supplies and electronic loads, and battery cyclers/emulators
• Experience with environmental stress testing of electronics including thermal and humidity cycling, vibration, and electromagnetic interference
• Domain knowledge of battery monitoring techniques, cell and pack failure modes and mitigation, and high voltage safety
• Strong data handling, processing, and presentation skills, with excellent problem-solving techniques and analytical ability
• Positive attitude and willingness to work individually and as part of a team; maintains a clean workspace and inventory of tools and equipment
• Be agile and adapt to evolving requirements and changes in direction

• Experience testing or verifying Battery Management System hardware, including functional verification of protection and measurement circuits
• Experience testing airborne electronic hardware to DO-160, DO-311A, SAE, MIL-810 (or similar standards) environmental tests; prior DO-160 training is a plus
• Knowledge of Electromagnetic Compatibility (EMC) and Electromagnetic Interference (EMI) testing, including HIRF and lightning-induced transient susceptibility
• Experience with high voltage Lithium-ion battery systems and battery pack cycle test equipment
• Experience with instrumentation (e.g. contactors, current/voltage sensors, thermocouples, accelerometers, strain gauges) and data acquisition
• Practical knowledge of root cause analysis (nondestructive) of electronics failure best practices
• Experience with MATLAB/Python for post-processing of data from equipment under test and external instrumentation
• Experience with LabView for data acquisition and test automation (invoking desired equipment functions in different conditions)
• Experience with the aircraft FAA certification process
• Strong physics and/or material properties background is a plus
• M.S. in Electrical Engineering is a plus

Compensation at Joby is a combination of base pay and Restricted Stock Units (RSUs). The target base pay for this position is $104,400 - $183,500/yr. The compensation package will be determined by job-related knowledge, skills, and experience.

Joby also offers a comprehensive benefits package, including paid time off, healthcare benefits, a 401(k) plan with a company match, an employee stock purchase plan (ESPP), short-term and long-term disability coverage, life insurance, and more.