A Selenium Developer is a professional skilled in using Selenium, a popular open-source tool for automating web browsers, to develop automated test scripts for web applications. They write code in programming languages like Java, Python, or C# to test the functionality, performance, and reliability of websites across different browsers. Selenium Developers focus on creating efficient, reusable, and maintainable test scripts that simulate user interactions, identify issues, and ensure web applications are bug-free. They play a key role in accelerating the software development process by automating repetitive testing tasks and improving test coverage.