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#2 HackerRank
Extensive library of coding challenges, interview prep kits, and skill certifications across algorithms, AI, databases, and more.
#3 Codeforces
Competitive‑programming community with regular contests, problem archives, and a rating system that tracks progress.
#4 CodeSignal
Assessment‑focused platform offering arcade challenges, interview practice, and AI‑driven skill scoring.
#5 CodinGame
Learn programming by solving puzzles that produce visual games; supports many languages and multiplayer contests.
#6 AtCoder
Japanese‑origin competitive‑programming site with weekly contests and a clean problem archive.
#7 TopCoder
One of the oldest platforms offering algorithm contests, marathon matches, and real‑world freelance gigs.
#8 InterviewBit
Curated interview‑question paths, mock interviews, and a community‑driven discussion board.
#9 CodeChef
Indian‑based competitive‑programming site with monthly contests, practice problems, and a strong community.
#10 Exercism
Mentor‑driven practice tracks for over 50 languages, focusing on code reviews and incremental improvement.
#11 Edabit
Beginner‑friendly bite‑size challenges that unlock as you solve, with gamified streaks and leaderboards.
#12 Coderbyte
Library of algorithm challenges, interview prep courses, and built‑in code editor with real‑time feedback.
#13 Codewars
Kata‑style challenges ranked by difficulty; community solutions and discussions help deepen understanding.
#14 Project Euler
Mathematics‑oriented problem set that encourages algorithmic thinking and efficient coding.
#15 Kaggle
Data‑science competition platform offering notebooks, datasets, and micro‑challenges for Python/R coders.
#16 Codility
Technical assessment platform with timed coding tasks, useful for interview practice and hiring tests.
#17 HackerEarth
Practice portal with algorithm challenges, hackathons, and company‑specific interview kits.
Massive repository of coding problems, tutorials, and interview experiences across all major topics.
#19 AlgoExpert
Curated set of 160+ interview‑style problems with video explanations, visualizations, and a built‑in IDE.
#20 Pramp
Free peer‑to‑peer mock interviews with live coding sessions and instant feedback.
#21 LeetUp
Gamified learning platform offering daily challenges, streak tracking, and community leaderboards.