An IT QA Test Developer creates and implements testing procedures to ensure IT systems, applications, and software are free from defects and meet user expectations. Their duties involve designing test cases, scripts, or procedures, executing manual or automated tests, identifying and documenting software bugs, and liaising with development teams to fix issues. They validate system data, assess system performance, and ensure software usability and functionality. Additionally, they participate in the full software development life cycle, from requirement gathering to post-implementation support, and continuously strive to enhance testing methodologies to improve product quality.