Senior EV Systems Engineer

Location/Work Arrangement: Norwalk, California | Full-Time | On-site with field travel Position Summary Our client is seeking a Senior EV Systems Engineer with 10+ years of relevant experience to support the architecture, integration, commissioning, validation, and continuous improvement of electric vehicle systems. This is a hands-on senior engineering role focused on vehicle-level integration across high-voltage batteries, electric propulsion, controls, charging, thermal management, hydraulics, low-voltage systems, diagnostics, and vehicle communications. The role will also support diesel-to-electric conversion programs for commercial and heavy-duty equipment. Responsibilities Lead EV system integration programs from requirements and architecture through commissioning, validation, production release, and field deployment. Develop vehicle-level requirements, system architectures, engineering specifications, bills of materials, and validation plans. Assess diesel-powered commercial vehicles and industrial equipment for conversion to electric propulsion. Integrate batteries, BMS, motors, inverters, chargers, DC-DC converters, vehicle control units, cooling systems, and charging interfaces. Design and review high-voltage and low-voltage electrical architectures, schematics, wiring, grounding, fusing, contactors, and protection systems. Integrate CAN-based vehicle communications, including SAE J1939, diagnostics, and fault-handling strategies. Develop and calibrate controls for propulsion, regenerative braking, charging, thermal management, hydraulics, and auxiliary systems. Perform commissioning activities, functional testing, validation, troubleshooting, and root-cause analysis. Maintain engineering documentation, change control, test records, and technical reports. Work with manufacturing, quality, procurement, software, service, customers, and suppliers. Support design reviews, customer acceptance testing, field troubleshooting, and regulatory or certification activities. Mentor junior engineers and technical staff. Qualifications Bachelor's degree in Electrical Engineering, Mechanical Engineering, Mechatronics, Automotive Engineering, Systems Engineering, or a related field. 10+ years of relevant experience in electric vehicles, hybrid vehicles, commercial vehicles, industrial machinery, automotive systems, or vehicle integration. Demonstrated experience leading vehicle or equipment integration projects through commissioning, validation, and production release. Strong hands-on knowledge of high-voltage batteries, BMS, motors, inverters, chargers, DC-DC converters, power distribution, contactors, and high-voltage interlocks. Experience developing or reviewing high- and low-voltage schematics, wiring diagrams, interfaces, and electrical protection strategies. Strong knowledge of CAN communications, SAE J1939, diagnostics, data logging, and vehicle-network troubleshooting. Experience integrating vehicle control units across propulsion, charging, thermal, hydraulic, and auxiliary systems. Strong troubleshooting, failure analysis, root-cause analysis, and validation testing skills. Knowledge of EV electrical safety and high-voltage testing practices. Strong technical writing, communication, project ownership, and mentoring skills. Valid driver's license and ability to travel as required. Experience with heavy-duty commercial vehicles, diesel-to-electric conversions, EV safety standards, MATLAB/Simulink, CAN diagnostic tools, CAD, or related engineering systems is preferred.