BASIC FUNCTION: HF Sinclair is seeking a Chemist for their Sonneborn facility in Petrolia, Pennsylvania. The Chemist conducts routine and non-routine chemistry/laboratory assignments for the Technology Department under limited supervision. Performs all types of analyses and tests in connection with process control, process improvement, raw material evaluation, quality control, and improvement of product lines. Provides analytical support to departments and may have a research and development focus. Provides direct support to the operation of the Hydrotreater guiding process changes, catalyst performance monitoring and product quality.