Hiring a DC.js/.js developer comes with several advantages. Firstly, these developers are skilled in creating highly interactive and dynamic data visualizations, allowing businesses to better comprehend their data, identify trends, and make informed decisions. They can transform complex data sets into visually appealing and understandable graphics that can be easily interpreted by non-technical team members.

Secondly, .js and DC.js developers are proficient in JavaScript, HTML, and CSS, which means they can seamlessly integrate data visualizations into web applications, enhancing the user experience. They can create custom charts and graphs that match your brand's aesthetics and cater to your specific needs, something pre-built libraries may not provide.

Thirdly, the flexibility of .js and DC.js allows the creation of a wide range of visualizations, from simple bar charts to complex hierarchical layouts. This versatility means that your visualization capabilities can grow and adapt as your business needs evolve.

Lastly, .js and DC.js are open-source libraries, eliminating licensing costs. They have a robust community of developers who continuously contribute to improving the libraries, ensuring they remain up-to-date with latest technological advancements. Consequently, hiring a DC.js/.js developer gives you access to cost-effective, customizable, and scalable data visualization solutions.