This is a senior technical leadership role for an engineer who understands the complete aftertreatment ecosystem, including SCR, DOC, DPF, DEF dosing and delivery, catalysts, mixers, pumps, injectors, sensors, controls, diagnostics, exhaust flow, thermal behavior, acoustic interfaces, and system validation. Lead integration of SCR, DOC, DPF, DEF tanks and delivery systems, pumps, injectors, lines, mixers, sensors, catalysts, controllers, control panels, monitoring equipment, diagnostics, exhaust piping, silencers, thermal systems, skids, and structural supports.