With 30,000 employees working together, Tetra Tech provides clear solutions to complex problems by Leading with Science to address the entire water cycle, protect and restore the environment, design sustainable and resilient infrastructure, and support the clean energy transition. Reasonable accommodations may be made to enable individuals with disabilities to perform these essential functions: - Design building mechanical (HVAC) systems, including development of system concepts, engineering calculations, energy modeling, equipment selection and sizing, layouts, specifications, and interdisciplinary coordination.