A Performance Tuner specializes in optimizing the performance of software applications, databases, and systems to ensure they run efficiently and effectively. They analyze system performance, identify bottlenecks, and apply techniques to improve speed, responsiveness, and resource usage. This can involve optimizing code, enhancing database queries, fine-tuning network configurations, and adjusting server settings. Performance Tuners often work with various tools and methodologies, including profiling, load testing, and monitoring tools, to improve application performance and scalability. Their goal is to ensure that systems can handle high traffic or data loads while maintaining a seamless user experience.