A Functions Developer designs and implements functions in software applications. They create algorithms to process data and achieve specific tasks, writing clean, testable, and efficient code. They often work with databases, integrating data storage solutions. They are responsible for debugging and resolving issues, improving system performance, and optimizing code for scalability. They also collaborate with other team members, such as UX designers and data scientists, to ensure the software meets user needs and business goals. They must stay updated on new programming languages and technologies, and often participate in code reviews.