Arduino Code Website

Hi, I have a project and I need to upload Arduino code through a self-made website. How can I do that?

what do you mean by code?
what type of Arduino?

is that like a binary software update to deliver OTA to an ESP type Arduino?

I mean the code we write in Arduino and press the upload button to upload. Is it possible to make a website that can write code and upload? I mean a self-made website, not the Arduino website.
The type of Arduino is Arduino Uno.

if you reverse engineer how they handle the serial port from the web browser and are able to develop the backend compile process (use CLI), sure you can do it.

Why not just make your code available on your web site for down load or have a link to the Arduino on line ide ?