Power DQA Engineer (ESS)

Responsibilities (What he/she will do after joining UI)

- Own system-level DQA and validation activities for Energy Storage System (ESS) products throughout the NPI lifecycle.

- Develop test plans and qualification criteria for ESS reliability, functionality, performance, safety, and system integration.

- Validate ESS architectures, including battery packs, BMS, PCS/inverters, EMS, power distribution, protection circuits, and grid interaction.

- Perform system integration testing for charge/discharge, grid-connected operation, backup power, load transitions, power outages, and recovery scenarios.

- Define and execute reliability validation, including temperature, thermal cycling, humidity, vibration, ESD, surge, and long-term operation.

- Validate BMS protection mechanisms, including over/under-voltage, over-current, short-circuit, temperature protection, SOC/SOH, and cell balancing.

- Validate PCS/Inverter performance, including conversion efficiency, load response, abnormal operating conditions, and protection mechanisms.

- Conduct high-power and thermal validation for battery cells, connectors, terminals, busbars, relays/contactors, and other high-current paths.

- Conduct failure analysis (FA), root cause investigation, and corrective action verification for NPI, reliability, and field/RMA issues.

- Apply FMEA/DFMEA, MTBF, statistical analysis, and field lessons learned to improve test coverage and prevent recurrence.

- Support second-source qualification, engineering changes, Control Run validation, and sustaining quality activities.

- Collaborate with EE, ME, FW, BMS, Power Electronics, PM, suppliers, and manufacturing teams to drive quality improvements.

Requirement (Must-Haves)

• Bachelor's degree or above in Electrical/Electronics, Power Electronics, Energy Engineering, or related fields.
• 5+ years of experience in hardware/system validation, reliability, or design quality engineering.
• Experience with ESS/BESS, UPS, PV/Solar Inverter, EV Charger, or other high-power systems.
• Strong knowledge of Battery Pack, BMS, PCS/Inverter, EMS, and AC/DC power systems.
• Familiar with Li-ion/LFP/NMC batteries, SOC, SOH, DOD, internal resistance, cycle life, and cell balancing.
• Experience with BMS protection, high-current/thermal, environmental, ESD, and surge validation.
• Proficient with oscilloscopes, multimeters, power analyzers, electronic loads, power supplies, data loggers, and thermal chambers.
• Capable of independently developing test plans, conducting FA, and verifying corrective actions.
• Knowledge of FMEA/DFMEA, MTBF, reliability engineering, and statistical analysis.
• Strong system-level problem-solving skills with an end-user-oriented mindset.

Preferred Qualifications

• Experience with residential/commercial ESS, BESS, solar energy storage, or hybrid inverters.
• Experience with Battery/BMS Analyzers, battery cyclers, and high-power test systems.
• Knowledge of PCS/Inverter, MPPT, DC bus, grid interface, and backup operation.
• Familiar with CAN, RS-485/Modbus, Ethernet, and BMS/EMS communication.
• Familiar with UL 9540/9540A, UL 1973, UL 1741, IEEE 1547, or IEC 62619.
• Experience with battery safety, thermal runaway risk, RMA/field analysis, or reliability lab management is a plus.

Benefits 

• International work environment and collaboration with global development teams
• Excellent work conditions
• Competitive package: great pay, perks, and benefits
• Group insurance and health coverage
• Flexible working hours and patterns
• Complimentary drinks and snacks at the office