A MaraDNS developer is responsible for maintaining and enhancing the MaraDNS software, a compact and secure open-source DNS server. Their duties include identifying and fixing bugs, improving server performance, and ensuring the security of DNS transactions. They also work on adding new features, such as support for new DNS record types or protocols. They must keep up-to-date with the latest DNS and internet security standards and practices. In addition, they might also have to create documentation and provide support to users. As MaraDNS is open-source, developers often collaborate with others in the community to improve the software.