iKnow! (https://iknow.jp) is a language learning service with tens of thousands of paying users and almost 10 million hours logged of study time. You can give our service a spin with a one-month free trial using the coupon code githubjobs. We are owned by a large Japanese company, DMM (http://eikaiwa.dmm.com/), but are an independent entity with a small company atmosphere and approach. We go from