Along with other great comments I would like to mention that in today's world the easiest and "quick win" for a developer to gain some publicity and huge moment

Along with other great comments I would like to mention that in today's world the easiest and "quick win" for a developer to gain some publicity and huge momentum in his career path is to embrace open source. There are many pathways for it, but start as a contributor then moderator and if for some reason original development team loses the interest in the project you can become the maintainer of it as well. The more popular the project the more benefits you can get and it is also a trend nowadays in talent acquisition by some well-known startups and even few enterprises. The world is changing fast, the new doors are opening, follow that!