Staff Process Engineer

Benefits

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About this role

Staff Process Engineer Houston, TX, Houston, Texas, US About Mariana Minerals Mariana Minerals is a software-first, vertically integrated minerals company on a mission to supply the critical minerals powering modern energy, AI, and defense technologies. We're reimagining the minerals supply chain by combining deep industry expertise with advanced software, automation, and data-driven decision-making. The Role Mariana Minerals is seeking a highly motivated Process Engineer to support our next-generation minerals processing pilot plant in Houston. You will help design, deploy, and operate first-of-its-kind refining processes for critical minerals. This role is highly hands-on and will play a key role in bridging R&D and plant operations, helping scale technologies from laboratory development through pilot demonstration and ultimately to commercial production. You will work closely with technicians, engineers, and cross-functional teams to ensure processes are robust, safe, and ready for industrial deployment. What You'll Do - Lead equipment and process design from concept through procurement, fabrication, installation, commissioning, and startup - Operate, troubleshoot, and improve pilot-scale processing equipment in collaboration with pilot plant technicians - Design and execute pilot-scale experiments to evaluate process performance, recovery, throughput, and product quality - Develop and maintain key process documentation including PFDs, P&IDs, mass and heat balances, operating procedures, and control narratives - Analyze experimental and operational data to identify opportunities for process optimization and scale-up - Support development of automated plant monitoring and optimization tools in collaboration with software and machine learning teams - Ensure safe operations by supporting EHS, hazard assessments, risk management, and management

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