A Human Factors Engineer enhances system usability by integrating human capabilities and limitations into design. Key responsibilities include user research, ergonomic assessments, and interface evaluation. Essential skills include analytical thinking, proficiency in design software, and communication. Typically working in multidisciplinary teams within industrial or academic settings, they collaborate with product designers and engineers. Career progression may lead to senior roles, project management, or specialization in fields like ergonomics or user experience design. Their work significantly improves safety, efficiency, and user satisfaction.