A Microformats developer builds web pages using microformats - a type of open data format built upon existing and widely adopted standards. They embed rich metadata within web pages about specific information like people, events, tags, etc., enhancing the value and functionality of the online content. Their work enables better data interoperability and web services integration. They also ensure that this data is machine-readable, improving search engine optimization. They often work in collaboration with web designers, backend developers, and SEO specialists, providing a critical role in structuring web content and enhancing web user experience.