Our client is seeking a skilled Senior Systems and Test Engineer to define, build, and maintain processes for the integration and testing of cells, modules, and high-voltage batteries across multiple projects. This role spans concept development through to industrialisation and serial production, supporting hybrid and electric vehicle programmes. The Senior Systems and Test Engineer will: Develop strategies and methodologies for testing cells, modules, and battery packs. Define engineering approaches for various battery technologies and project requirements. Lead fault-finding and standardisation of solutions for inline and end-of-line testing. Specify, commission, and improve test rigs and diagnostic tools. Use CAN-based software (e.g. CANalyser, CANape, CANoe, Tera Term) for diagnosis and problem-solving. Prepare engineering documentation including PFMEAs, control plans, SOPs, and test reports. The Senior Systems and Test Engineer will have: Degree (or equivalent experience) in Electrical, Electronics, Controls, or Mechatronics Engineering. Proficiency in MATLAB and CAN-based diagnostic tools. Knowledge of battery system architecture and battery management systems. Experience in electrical component integration and development, particularly high-voltage systems. Familiarity with compliance engineering to standards such as EMC, functional safety, ISO26262. Ability to interpret wiring diagrams and liaise effectively with customers, suppliers, and build teams. This role