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HackerRank

Coding challenges plus free skill certification tests.

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Oct 29, 2026
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hackerrank.com

HackerRank offers coding challenges and free skill certification tests in languages and topics like Python, SQL and problem solving.

Why it is worth a bookmark

  • Practise coding in many languages
  • Earn free skill certificates
  • Prepare for job coding tests
  • Take part in contests

Good to know

It's free for developers. Many companies use HackerRank for their coding tests, so practising here helps you get comfortable with the format before a real interview.