Are there any websites for coding challenges which gamify coding skills?

Practice and level up your development skills and prepare for technical interviews.

Achieve code mastery through challenge.

Coderbyte is a place built for anyone to practice and perfect their programming skills.

CodeChef is a not-for-profit educational initiative by Directi, an Indian software company. It is a global programming community that fosters learning and friendly competition, built on top of the world’s largest competitive programming platform.