Develops and reviews process flow diagrams, P&IDs, shutdown and permissive tables, operating manuals, and procedures. Leads technical review meetings, resolves multidisciplinary design issues, and supports plant reliability, operability, hazard, and safety reviews. Coordinates with engineering disciplines and customers to ensure compliant plant design, improves work processes and standards, and mentors less experienced engineers. The role requires extensive process design experience and strong chemical or mechanical engineering knowledge.