kirinokirino

TL;DR: you should download some anki deck instead, the content is (at least in russian and japanese, the only languages I checked) is not curated and plain wrong. The Idea is simple enough. Learning 1k most used words should be enough to understand simple conversation, allowing to pick up other words from context. Word in target language - word in native language is the simplest way to achieve...

Very promising, but highly depends on how exactly everything is calculated. Maybe after adding websites like hackerrank in combination with github and other repositories this will be the most reliable way to judge knowledge/experience without looking at portfolio or interviews.