A Kohana developer designs, develops, and maintains web applications using the Kohana PHP framework. They are responsible for writing clean, maintainable, and efficient code in line with industry standards. They use Kohana's tools to make database access, authentication, and routing easier, thus reducing development time. Kohana developers also troubleshoot and fix bugs, ensure the performance, quality, and responsiveness of applications, and collaborate with other team members to define, design, and ship new features. Furthermore, they stay updated with new technology trends, understand client requirements, and translate them into application features.