[devs1010]

It depends what you consider proficient, I was definitely producing in my job at less than 1 year experience but I definitely feel that I know more now than I did then. I think it takes at least a year of solid experience to get to the point where you can really be reflective about what you do and to understand writing clean, maintainable code. (and every year from then on out just adds more of this) For someone who is motivated, as I was, its fairly reasonable to be able to start producing with only a few months experience, to where you can make things that work, just that the solutions you come up with may not be as elegant as they could be and the code may be messy. It takes time to get that extra sense when coding to use best practices, etc and this is also related to who you work with, the more you can be around more experienced developers, the faster you will progress