A SIS Engineer in a manufacturing or industrial environment is typically responsible for designing, implementing, and maintaining safety instrumented systems that protect personnel, equipment, and processes from hazardous conditions. This includes conducting risk assessments, performing safety integrity level (SIL) calculations, specifying safety PLC logic, and ensuring compliance with industry standards such as IEC 61511. SIS Engineers often collaborate with process engineers, operations staff, and maintenance teams to review system performance and troubleshoot issues. Their role may also involve regular safety audits, system testing, and supporting incident investigations to continuously improve plant safety.