Senior Test Capability Engineer - Horsham - £Competitive + Benefits A leading clean energy technology organisation is seeking a Senior Test Capability Engineer to support the ongoing development and optimisation of advanced fuel cell and electrolyser systems. This Senior Test Capability Engineer position sits within a fast-paced test environment and plays a direct role in ensuring the capability, availability and reliability of multiple on-site test stands. The successful Senior Test Capability Engineer will lead technical upgrades, resolve performance issues, and ensure safe, compliant and continuous test operations.The Senior Test Capability Engineer will work closely with internal stakeholders to define future test capability requirements, evaluate design solutions, and deliver upgrades aligned with test schedules and programme milestones. Key ResponsibilitiesSupport the delivery of a scalable and cost-effective test stand fleetAssess feasibility of new capability requests and validate performance across operating conditionsProduce and review PandIDs, electrical schematics and technical drawingsConduct analytical assessments including efficiency calculations and heat balancesLead failure mode analysis, fault finding and root cause investigationsSupport commissioning, maintenance planning and work package schedulingConduct risk assessments including HAZID, HAZOP and FMEAProvide technical leadership, peer reviews and mentoring to junior engineersEnsure all activities meet re