Staff Process Engineer

About the Company

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.

Responsibilities

• 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 of change processes

Requirements

• B.S., M.S., or PhD in Chemical Engineering or a related field
• 10+ years of experience in operations, process scale-up, or plant design in minerals processing, chemicals, specialty materials, oil & gas, or related industries
• Demonstrated experience driving equipment design, commissioning, and plant operation
• Strong understanding of unit operations such as kilns, furnaces, ion exchange, solvent extraction, solid liquid separation, leaching, or electrowinning
• Ability to design experiments, troubleshoot complex processes, and analyze operational datasets
• Strong commitment to Health, Safety, and Environmental compliance
• Excellent technical writing, communication, and teamwork skills