In the 80's and 90's it was not possible, because the industry used very expensive closed-source applications and frameworks. No student or private person could afford these things. (Speaking of software in general, because there were no mobiles of course.)
But nowadays it's completely different. The leading technologies are free, well documented, have big communities, and are being taught in every university, especially when it comes to UI/UX development and mobile apps.
=> It's easier than ever before to produce industry-level software on your own.
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