An ITK (Insight Segmentation and Registration Toolkit) developer works on a software system to process images, primarily for biomedical applications. They develop algorithms for segmenting, registering, and analyzing multidimensional data. Their tasks include writing code, debugging, testing, and integrating new features or improvements. Moreover, they collaborate with researchers, clinicians, and other developers to understand user requirements, deliver solutions, and ensure the software's performance and reliability. ITK developers also document their work to assist other developers and users, and they may contribute to open-source community projects. They need proficiency in C++, Python, and image processing concepts.