Hiring an Accessibility/WAI-ARIA developer is vital to ensure your website or application is accessible to all users, including those with disabilities. These developers can implement WAI-ARIA (Web Accessibility Initiative – Accessible Rich Internet Applications) standards, making your site usable for screen readers and other assistive technologies. By doing so, you not only comply with legal accessibility standards but also broaden your user base. They can improve your website's SEO, user experience, and overall quality, creating a more inclusive digital environment. In essence, their expertise can enhance your brand's reputation for inclusivity and accessibility.