Spoj
Sphere Online Judge created for the coders’ community to train, to learn and to make progress.
17 Alternatives To Spoj
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Learn programming with a multiplayer live coding strategy game.
CodeSignal
CodeSignal is the leading assessment platform for technical hiring.
Coderbyte
Coderbyte is a place built for anyone to practice and perfect their programming skills.
Codewars
Achieve code mastery through challenge.
DuoCoder
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Halite Programming Challenge
Halite is an artificial intelligence programming challenge.
InterviewBit
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LeetCode
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MockRabbit
Practice the mock interview using the MockRabbit app, assess your readiness and get your dream job.
Project Euler
Project Euler is a series of challenging mathematical/computer programming problems that will…
Robocode
Robocode is a programming game where the goal is to code a robot battle tank to compete against…
Screeps
Learn to code JavaScript by playing game.
The AI Games
Challenge people worldwide by coding bots in awesome games.
Topcoder
The Topcoder home page has received a slick new makeover that lets new customers quckly login, discover the power of our community, and launch challenges.
exercism
Download and solve practice problems in over 30 different languages.
hackattic
No nonsense, real world programming challenges