A Fortran developer designs, codes, tests, and debugs programs using the Fortran language, a high-level programming language primarily used for numerical and scientific computing. They use its powerful features like array programming and parallel processing to solve complex computational problems. They also work on maintaining and optimizing existing Fortran applications, ensuring the code is efficient and robust. The developer collaborates with other team members or clients, interprets their needs, and translates them into viable solutions. They also document their work, allowing others to understand the code structure and its functionality. They need to stay updated with advancements in Fortran and related technologies.