The company said that it was "completely overhauling our developer systems, updating our server software and rebuilding our entire database".
It had also said that personal data such as credit card information and passwords were encrypted, though around 275,000 logins were reportedly put at risk by the hack.
After a week being under maintenance, some components have finally been starting to come back online over the last few days.
The look and feel of the website so far seems to be mostly the same as before, with Mac, iOS and Safari dev centres back online
Certificates, identifiers and profiles, iTunes connect, bug reports and software downloads services are also available.
Apple has a system status page for updates on what is or what isn't available yet.