cheers..

Its the most important thing for any software product to sustain its life, interapobaility, platform independency, and many factors..

As a developer, we dont have much role (not completely ruling out though) in this phase basically. It purely depends on the business needs and mainly designed in coordination with business analysts along with the analysts ..

Developers architecture begins once after project architecture begins and this architecture is at every level..

Just google out and learn the various things from famous quotes if any..

Its not easy to say everything here, and even everybodies ideas differ. You will understand it by just going through many write ups..

For the time being, just sit back and enjoy coding ...

cheers