Phoenix Tailings is seeking an experienced and visionary Principal Process Engineer to lead the development, optimization, and scaling of innovative processes for sustainable metal refining at our Burlington, MA location. This leadership role will drive high-impact projects, set technical direction, and play a critical part in ensuring the scalability and efficiency of Phoenix Tailings’ cutting-edge technologies. As a Principal Process Engineer, you will take ownership of complex process engineering challenges, mentor a team of engineers, and collaborate cross-functionally to achieve operational and sustainability goals. This role demands expertise in process engineering, process design, and scale-up, as well as a passion for clean technology and innovation.