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Most conferences will accept almost anything even tangentially related to their focus. Because nearly all proposals will come from companies trying to market their crap in conference talks disguised as something else, when they get applications from people with something really interesting to say which is not related to something they're making money on, they will almost certainly accept. It may b e hard for the first couple of talks as you don't have any experience doing it, which means you may suck at it, but you can start by talking at local meetups or even internally at your company, which is less challenging and will get you some experience to get started.