The provided text only includes the job title "Mark Up Developer" and a location "Yerevan". There is no further information about responsibilities, required skills, or company details. Therefore, a detailed job description cannot be generated. A Mark Up Developer is responsible for converting designs and wireframes into clean, efficient, and semantic code, using languages like HTML, CSS, and potentially JavaScript. They ensure the website or application is accessible and performs well across different browsers and devices. This typically involves collaborating with designers and developers throughout the project lifecycle.