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About the job

Sr. Test Engineer

Location: Mountain View, CA Team: Power Systems

The Impact You’ll Make:

We are looking for a hands-on Senior Test Engineer with 5+ years of experience developing and executing automated tests for power electronics and renewable energy systems. In this role, you will build test capability for solar photovoltaic (PV), battery energy storage systems (BESS), power conversion systems (PCS), inverters, DC/DC converters, and related grid-connected power equipment. You will use LabVIEW and Python to automate complex electrical tests, integrate laboratory instruments, validate product performance, support safety and compliance certification, and drive design verification and reliability testing from prototype through product release.

The ideal candidate combines strong power electronics fundamentals with practical laboratory experience, test automation skills, and a methodical approach to troubleshooting, test documentation, and root-cause investigation.

Key Responsibilities:

Test Development & Automation

Develop, maintain, and debug automated test systems using LabVIEW and Python for power electronics, solar, and energy storage products.

Create reusable test frameworks, instrument drivers, sequence control, data logging, reporting, and automated pass/fail evaluation.

Interface with laboratory equipment through SCPI, VISA, Ethernet, USB, serial, CAN, and other applicable communication protocols.

Develop repeatable, traceable test scripts and procedures suitable for engineering validation and production use.

Manage test software revisions, calibration records, test configurations, and measurement-system documentation.

Power Electronics & Renewable Energy Testing

Develop and execute tests for PV inverters, power conversion systems (PCS), bidirectional converters, DC/DC converters, battery interfaces, and grid-connected power systems.

Characterize efficiency, power quality, dynamic response, transient behavior, thermal performance, protection functions, and operating limits.

Test across operating voltage, current, power, temperature, load, and grid conditions.

Troubleshoot electrical, control, firmware, instrumentation, and system-integration issues in high-voltage laboratory environments.

Laboratory Equipment & Instrumentation

Configure and operate PV simulators and solar-array simulators, including programmable I-V curves and dynamic irradiance profiles.

Operate regenerative grid simulators and grid emulators for AC source, grid disturbance, and grid-interconnection testing.

Use battery simulators, battery cyclers/testers, bidirectional DC sources, and programmable electronic loads.

Use oscilloscopes, differential and current probes, power analyzers, digital multimeters, data-acquisition systems, and precision current/voltage sensors.

Work with thermal chambers, thermocouples, infrared cameras, insulation/hipot testers, ground-bond testers, and other environmental or safety equipment as needed.

Define safe test setups, instrument ranges, grounding, interlocks, emergency shutdowns, and measurement uncertainty considerations.

Design Verification & Validation (DVT)

Develop and execute Design Verification Test (DVT) plans, test procedures, test matrices, and detailed reports against product requirements.

Translate requirements into test cases with defined setups, operating conditions, stress levels, sample sizes, and acceptance criteria.

Perform functional, performance, stress, endurance, environmental, thermal, and fault-condition testing.

Track failures and anomalies, coordinate root-cause investigations, and verify corrective actions through regression testing.

Support design reviews and release decisions with objective, traceable test evidence.

Compliance & Certification Testing

Support product compliance testing for applicable UL and IEC standards for power conversion equipment and battery energy storage systems.

Support testing and documentation for applicable requirements such as UL 1741, UL 62109, UL 9540, UL 9540A, IEEE 1547/1547.1, and IEC 62477, as relevant to the product and certification plan.

Coordinate test setups, instrumentation, test samples, procedures, data packages, and issue resolution with compliance engineers and external certification laboratories.

Support electrical safety, abnormal operation, protective-function, insulation, temperature-rise, and relevant EMC pre-compliance testing.

Maintain records of test configuration, calibration status, raw data, deviations, and results.

Reliability & Accelerated Testing

Plan and execute reliability and endurance tests for power electronics and energy storage products.

Support thermal cycling, power cycling, temperature/humidity exposure, high-temperature operation, vibration, and other applicable stress tests.

Monitor test articles and log operating conditions, interruptions, degradation, faults, and failures throughout extended-duration testing.

Analyze trends and failure data to identify weaknesses and recommend design or process improvements.

Data Analysis & Reporting

Analyze test data using Python and appropriate numerical, statistical, and visualization tools.

Automate report generation, plotting, data reduction, and comparison against requirements.

Produce clear test plans, procedures, reports, failure summaries, and engineering recommendations.

Ensure test results are reproducible, traceable to requirements, and supported by raw data and configuration records.

Laboratory Operations & Collaboration

Help maintain a safe, organized, calibrated, and reliable high-voltage power electronics laboratory.

Develop equipment checklists, operating procedures, and preventive-maintenance practices.

Collaborate with hardware, firmware, controls, systems, reliability, compliance, and manufacturing engineers.

Provide hands-on troubleshooting and technical guidance to other engineers and technicians.

The Skills You Bring:

BS or MS in electrical engineering, Electronics Engineering, Mechatronics, or a related discipline, or equivalent practical experience.

5+ years of hands-on test engineering experience in power electronics, renewable energy, energy storage, industrial power systems, or a closely related field.

Strong LabVIEW skills for automated test development, instrument control, data acquisition, and test sequencing.

Strong Python skills for instrument automation, data processing, analysis, visualization, and test/report automation.

Practical experience with SCPI/VISA instrument control and integrating multiple instruments into an automated test system.

Experience testing high-voltage and high-power equipment using appropriate safety practices.

Ability to read schematics, interpret electrical specifications, develop test procedures, and troubleshoot complex hardware/software interactions.

Experience with DVT, test documentation, failure tracking, and root-cause investigation.

Nice to Have:

Experience with PV simulators, regenerative grid simulators, battery simulators/cyclers, and bidirectional DC power equipment.

Experience with grid-connected inverters, PCS, BESS, DC/DC conv