A Catia developer specializes in utilizing Dassault Systemes' Catia software suite, a computer-aided design (CAD) program, to design, model, and simulate products. Their tasks include creating complex models, conducting design validation, and implementing engineering changes. They also work closely with other engineers and designers to ensure specifications and requirements are met, and often troubleshoot any issues related to the software. In addition, they may be responsible for training others in the use of the software, maintaining design documentation, and ensuring compliance with industry standards and regulations.