Hiring a developer with years of experience brings a wealth of knowledge, skills, and expertise to your team. They have a proven track record of handling complex projects and problem-solving capabilities. Their long-term exposure to the industry ensures they are well-versed with the latest technologies and development practices. They can mentor junior developers, improving the overall team efficiency. Their experience can help in making strategic decisions, reducing project risks, and delivering quality outputs in a timely manner. Overall, their addition can significantly boost your project's success rate.