To thrive as a Classic ASP Developer, you need strong proficiency in VBScript, HTML, CSS, and SQL, typically backed by prior experience with legacy web applications and a relevant IT degree. Familiarity with IIS, version control systems like Git, and migration tools is valuable, and certifications in web development or Microsoft technologies can be beneficial. Effective communication, problem-solving abilities, and adaptability help developers address technical debt and collaborate across teams. These skills are crucial for maintaining, updating, and modernizing legacy applications while ensuring smooth integration with newer technologies.