As the Sr. Field Service Engineer, you will provide technical support for ESS (Energy Storage System) project sites, focusing on issue analysis and field service. This role serves as the primary communication channel between customers and contractors, troubleshooting quality issues, and producing detailed field service reports. You will lead cross-functional efforts to resolve quality problems, follow up on product analysis, root cause investigations, and implement quality improvement and preventive actions. Additionally, you will collaborate closely with the headquarters in Korea to report, analyze, and resolve issues effectively.