HackerEarth
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HackerEarth is a competitive programming and coding challenge platform with over 10 million developers solving problems across multiple languages. Companies use it to host hackathons, recruit developers, and screen job candidates, which means the problems tend to reflect real hiring bar. The platform has scaled dramatically since 2012 and now sits at the intersection of learning, recruitment, and community.
It's ideal for engineers building algorithmic skills or job hunting through coding contests. The platform combines learning with networking and recruitment opportunities in a way most educational sites don't, which makes it powerful if you're actively job searching or want to practice at interview level.