A Calibre EqDRC developer works on the development, implementation, and optimization of Electronic Design Automation (EDA) software, specifically the Calibre EqDRC tool, used for design rule checking and electrical rule checking in semiconductor design. The developer's duties include enhancing the tool's capabilities, troubleshooting technical issues, and supporting integration with other EDA tools. They collaborate with design teams to understand requirements, develop custom solutions, and automate design processes. Moreover, they must stay updated with the latest technology trends in the semiconductor industry and continually improve the performance and efficiency of the Calibre EqDRC tool.