Customized Customer log-in Page

Hi all,

I'm looking to build a website for my client. For now, I need to build a typical website. However, a year or two down the road, they also want to add log-in accounts for their clients. The clients can register for their own usernames/passwords similar to the Squarespace commerce customer login. But the information on the customer page after the log-in will be different. Can a customized customer page (after log-in) be achievable on Squarespace platform (with a backend developer help, of course)? I just want to make sure it's possible before I build the site on this platform. If it's not possible directly on Squarespace, is there a way to work around this?

Thank you in advance for your help!