The world of web application design is one that is constantly evolving. Experts in web application development services will know that a great many large companies have multiple portals, as well as different technologies that run them. These days, there are many different entities that require application for the internet, including business to business interaction. The best web application design firm will have no trouble providing their clients with something that perfectly suits their needs.
No one should work with custom application development professionals that come across as amateurs. Confusing website design and interface design, or websites with web applications can be easy for amateurs, but not for experts in web application design.
Experts in web portals and portal integration can explain that the popularity of web based applications is mostly due to the ubiquity of web browsers, as well as the convenience of using a browser as a client, which is sometimes called a thin client. The most competent web application design firm can also provide business applications that will range in type from content management systems to invoicing for freelances to document management systems to financial and banking systems. Good references here.