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#2 HackerRank
Widely used coding‑assessment platform with a massive library of challenges across algorithms, databases, AI, and domain‑specific skills.
#3 LeetCode
Extensive collection of algorithmic problems, interview‑focused playlists, and a vibrant community for peer discussion.
#4 Codility
Technical screening tool that provides timed coding tests, real‑world task simulations, and detailed candidate reports.
#5 Coderbyte
Offers coding challenges, interview prep courses, and an automated assessment engine for recruiters.
#6 HackerEarth
Platform for skill‑based hiring, hackathons, and a large practice library covering data structures, AI, and system design.
#7 InterviewBit
Free interview‑preparation portal with curated problem sets, mock interviews, and a gamified learning path.
#8 Codewars
Community‑driven kata platform where developers solve challenges, earn ranks, and view multiple solution approaches.
#9 Edabit
Beginner‑friendly coding practice site with bite‑sized challenges and instant feedback.
#10 Exercism
Open‑source platform offering mentored practice tracks in over 50 languages with code reviews from volunteers.
#11 Qualified
Assessment suite for hiring that includes coding tests, live interviews, and AI‑driven candidate scoring.
#12 CodinGame
Gamified coding challenges where developers solve puzzles by writing code that controls visual games.
#13 TestDome
Provides pre‑built coding tests, SQL, and logic assessments with automatic grading and analytics.
#14 Triplebyte
Technical screening platform that evaluates candidates via a custom assessment and matches them with employers.
#15 Interview Cake
Interview‑prep site focused on algorithmic thinking, offering detailed solution walkthroughs and practice problems.
#16 Pramp
Free peer‑to‑peer mock interview platform with live coding sessions and feedback from fellow engineers.
#17 Codeforces
Competitive programming community hosting regular contests, problem archives, and rating system for skill tracking.
#18 Kaggle
Data‑science focused platform offering coding notebooks, competitions, and tutorials for Python, R, and ML workflows.
Large repository of coding problems, tutorials, and interview‑specific question banks across many topics.
Skill‑assessment quizzes that gauge proficiency across programming languages and technologies, integrated with learning paths.
Enterprise‑grade assessment platform offering coding tests, AI‑based proctoring, and detailed analytics for hiring.