At Digital Expand, we use two content management systems (CMS) to build websites for our clients. While we have our proprietary CMS that we use for most projects, we often choose to use WordPress for large business websites that require additional functionalities such as client portals. Here are some of the reasons why:

1. Customizable Client Portals: WordPress offers a wide range of plugins and themes that can be used to build highly customizable client portals. These portals can be tailored to meet the specific needs of our clients, including features such as document sharing, project management tools, and collaboration features.
2. Scalability: WordPress is highly scalable, which makes it a great choice for large business websites that may need to handle high levels of traffic and data. As the website grows, WordPress can be easily scaled up to accommodate the increased demand.
3. Security: WordPress has a large community of developers who are constantly working to improve the platform's security features. This can provide added peace of mind for large businesses that need to ensure that their website and client portals are secure.
4. SEO Optimization: WordPress has many built-in SEO optimization features, such as clean URLs, meta descriptions, and permalinks, that can help to improve a site's visibility in search engines. This is particularly important for large businesses that need to attract more organic traffic to their site.
5. Ecosystem: WordPress has a massive ecosystem of developers, designers, and users who contribute to the platform's growth and development. This means that there are a large number of resources available for troubleshooting, customization, and development, making it easier for us to work on large business websites with complex functionalities.

Here are some examples of large business websites that we have built using WordPress with client portals:

1. A financial services company that needed a client portal to manage client accounts and provide access to financial planning tools and resources.
2. An e-commerce platform that required a client portal for managing orders, returns, and customer support.
3. A healthcare organization that needed a client portal for secure document sharing and collaboration between patients and healthcare providers.

WordPress is a highly customizable, scalable, and secure CMS that is a great choice for large business websites that require additional functionalities such as client portals. By leveraging WordPress's ecosystem, SEO optimization features, and security features, we can build robust and highly functional websites for our clients.