Custom login for Office 365

Hi there, We are seeking a skilled Web Engineer to develop a feature of one of our latest projects. We're building a custom login form for Microsoft Online Services, where users sign in with their Office 365 credentials. These credentials then get passed to [login to view URL] and upon success, the user gets redirected to portal.microsoftonline.com. We need to find out if there's a way to load a website ([login to view URL] in this case) in the background, fill in the credentials automatically and submit the form. After submitting the form, the URL should be checked before redirecting the user to that URL. What are the possibilities to accomplish this? Can this be done with JavaScript behind our custom login form or do we need to use some server-side technology? Do you have the answers to these questions or are you able to develop these functionalities? Then do not hesitate to bid on this project! But please only place your bid if you're really can offer a solution.