To hire the right ASP.NET developers for a complex project, start by clearly defining your project requirements and the specific skills needed. Look for candidates with proven experience in similar projects and ask for code samples or a portfolio. During interviews, focus on technical skills related to ASP.NET, such as MVC architecture, database management, and performance optimization. Conduct practical coding tests to evaluate their problem-solving abilities. Additionally, consider their communication skills and how well they can work in a team. When you hire ASP.NET developers who meet these criteria, you increase the chances of your complex project being successful.