That really depends on what you want to do. For most webapps, the algorithm you need already exists in a library, and your job is to tap into it. For those ap

That really depends on what you want to do. For most webapps, the algorithm you need already exists in a library, and your job is to tap into it. For those apps that require serious algorithmic innovation, your best bet is to start with a math degree, or (at the very least) a profound interest in mathematics.