A ClamAV developer works on the ClamAV open-source antivirus engine, used for detecting trojans, viruses, malware, and other malicious threats. Their tasks include writing and debugging code, optimizing software for performance and reliability, and updating virus databases. They also collaborate with other developers to design new features or enhancements, maintain documentation, and address user feedback. They may work on integrating ClamAV with other software or developing APIs. Their role is crucial in ensuring the security of systems using ClamAV, requiring a strong understanding of programming languages, antivirus software, and cybersecurity principles.