I'm a c++ coder but for bots, the easiest and fastest way is to use node.js

I built my own bot to trade on bittrex a while ago. It worked alright for a while, but ended up doing a few unwise "buy" that cancelled all the earnings

I find it much easier, and less stressful, to trade manually. I still use the bot for buy orders though, as it allows me to place buy orders for several coins, even though I only have the funds for one of them - whichever reaches the target first, gets bought. You can't do that on an exchange directly, since you need to commit the funds when you place the order.