HackerRank
SaaSFree coding practice platform with skill certifications recognized by employers.
★ 3.9Free for developersFreeReviewed Jun 2026
Free
About
HackerRank is one of the largest coding practice platforms, free for developers, with problem tracks across algorithms, data structures, SQL, and a dozen languages plus role-based skill certifications you can attach to your profile.
Because many employers run their actual coding assessments on HackerRank, practicing there has a second benefit: familiarity with the exact environment you'll be tested in.
Key Features
- ✓Free practice across algorithms, SQL, and more
- ✓Skill certifications for your profile
- ✓Same environment many employers test in
- ✓Interview preparation kits
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