the code is which framework based?
No framework.
You can see here the variety of Stack options it allows:
https://suitecrm.com/wiki/index.php/Compatibility_Matrix
But if you mean a standard basic PHP framework, it doesn’t use any. It uses a bunch of popular PHP libraries (composer, bootstrap for theme SuiteP, etc.) but nothing structural.
EDIT, July 2021: for versions 8.0 and newer, the answer is different, search specifically for that version and you will find more about it’s new architecture
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thanks bro