That's a weird thing to ask on a site full of software developers, even if most people here probably spend their time writing some angular or react site that's

That's a weird thing to ask on a site full of software developers, even if most people here probably spend their time writing some angular or react site that's a thin layer over a mongodb database and has hardly any 'meat' to it. If you haven't used something from calculus (or other branch of mathematics beyond grade school stuff) in this sector, you've either been avoiding it or had others do the work for you on stackoverflow or something. You can't even have big O notation without calculus.