Hands-on coding exercises, challenges, and real-world practice platforms.

Subcategories

• Coding Exercises & Practice - 35 resources (14 free, 11 freemium, 10 paid)
• Algorithms & Data Structures - 23 resources (15 free, 8 freemium, 0 paid)
• SQL & Database Practice - 17 resources (13 free, 4 freemium, 0 paid)

All Resources (75)

Coding Exercises & Practice

• AtCoder Free
  • Japanese competitive programming contests and practice problems.
• CodeChef Free
  • Competitive programming platform with monthly contests and practice problems.
• Codeforces Free
  • Competitive programming contests with real-time rating system.
• Codewars Free
  • Community-driven coding challenges (katas) in multiple programming languages.
• CodinGame Free
  • Gamified coding challenges and programming puzzles with multiplayer.
• CodingBat Free
  • Free practice problems for Java and Python with instant testing.
• Exercism Free
  • Free code mentorship and practice in 70+ programming languages with mentor feedback.
• Exercism - Mentoring Free
  • Free one-on-one mentorship for code improvement in 70+ languages.
• Interviewing.io Free
  • Free anonymous technical interview practice with real engineers.
• Kickstart Free
  • Free coding interview practice with Google engineers.
• Pramp Free
  • Free peer-to-peer mock interviews for technical and behavioral questions.
• Sanfoundry Free
  • Thousands of MCQs, programming questions, and technical interview resources.
• Sphere Online Judge Free
  • Large collection of algorithmic problems with community solutions.
• TopCoder Free
  • Competitive programming arena and software development challenges.
• Codebasil Freemium
  • Mock coding interviews with real-time collaboration.
• Codelab Freemium
  • Interview preparation platform with coding problems and company tests.
• Codemia Freemium
  • Real-world software engineering exercises and system design practice.
• Codility Freemium
  • Programming tasks and online interviews for developers.
• Daily Coding Problem Freemium
  • Daily coding interview problems sent to your inbox.
• Edabit Freemium
  • Beginner-friendly coding challenges with instant feedback in multiple languages.
• GreatFrontEnd Freemium
  • Frontend-focused coding exercises, UI challenges, and interview prep.
• HackerEarth Freemium
  • Coding challenges, hackathons, and interview preparation platform.
• HackerRank Freemium
  • Coding challenges, algorithms, data structures, and interview preparation.
• LeetCode Freemium
  • Technical interview preparation with 3000+ coding problems and mock interviews.
• TestDome Freemium
  • Pre-employment testing platform with programming exercises.
• Interview Pro Paid
  • Mock interviews with engineers from FAANG companies.
• AlgoExpert Paid
  • Interview prep platform with curated algorithm problems and video solutions.
• AlgoExpert - Systems Expert Paid
  • System design interview course with real-world architecture problems.
• CodeInterview Paid
  • Mock interviews with real engineers from top companies.
• CoderPad Paid
  • Live coding interviews and technical assessments.
• Devskiller Paid
  • Technical assessment platform with real-world coding tests.
• HireVue Paid
  • Code-based assessments and technical interviews platform.
• Interview Cake Paid
  • Interview preparation with guided practice problems and solutions.
• Interview Camp Paid
  • System design and coding interview preparation course.
• VetBoss Paid
  • System design and coding interview simulation with real-world scenarios.

Algorithms & Data Structures

• A2OJ Free
  • Problem sets organized by difficulty and topic.
• AtCoder Problems Free
  • AtCoder practice problems with difficulty ratings.
• Code Abbey Free
  • Programming problems for beginners to experts.
• Codeforces - Problems Free
  • Database of competitive programming problems.
• Codeground Free
  • Practice platform with algorithmic problems.
• CP-Algorithms Free
  • Comprehensive archive of algorithms and data structures with implementations.
• CSES Problem Set Free
  • Competitive Programming Essential Skills problem set.
• GeeksforGeeks Free
  • Computer science tutorials, algorithm explanations, and practice problems.
• Kattis Free
  • Programming contest problems from various competitions.
• NeetCode Free
  • Curated coding problems for interview preparation.
• Project Euler Free
  • Mathematical and computational programming problems.
• SPOJ Free
  • Online judge with thousands of programming problems.
• USACO Guide Free
  • Curated learning path for competitive programming from bronze to platinum.
• UVa Online Judge Free
  • Classic programming problems and contests.
• VisualAlgo Free
  • Interactive algorithm visualizations for sorting, graph, and data structure algorithms.
• Binary Search Freemium
  • Collaborative coding problems and real-world interview questions.
• Brilliant - Computer Science Freemium
  • Interactive CS fundamentals including algorithms, logic, and cryptography.
• GeeksforGeeks - DSA Self Paced Freemium
  • Structured data structures and algorithms course with practice problems.
• HackerRank - Algorithms Freemium
  • Algorithm practice problems from warm-up to hard difficulty.
• InterviewBit Freemium
  • Interview preparation platform with curated problem sets.
• LeetCode - Explore Freemium
  • Curated learning paths for data structures and algorithms.
• LeetCode Daily Freemium
  • Daily coding challenge with 3000+ problems.
• LintCode Freemium
  • Coding interview practice with 1000+ algorithm problems.

SQL & Database Practice

• DB-Fiddle Free
  • Free online SQL database playground.
• Learn SQL Online Free
  • Interactive SQL tutorials for beginners with hands-on exercises.
• Mode SQL Tutorial Free
  • SQL analytics tutorial for data analysis.
• pgExercises Free
  • PostgreSQL exercises from basic to advanced with a real database schema.
• Schemaverse Free
  • SQL-based space strategy game.
• Select Star SQL Free
  • Free SQL tutorial based on real datasets.
• SQL Practice Free
  • Browser-based SQL practice with instant query execution and results.
• SQL Zoo Free
  • Interactive SQL tutorials and exercises.
• SQLbolt Free
  • Interactive SQL lessons and exercises.
• SQLBolt Interactive Free
  • Interactive SQL tutorial with exercises built into the browser.
• SQLFiddle Free
  • Online tool for testing SQL queries.
• SQLTeaching Free
  • Interactive SQL lessons with real-time query execution in the browser.
• W3Schools SQL Free
  • SQL tutorial with interactive exercises.
• DataLemur Freemium
  • SQL interview questions from top tech companies with solutions.
• HackerRank - SQL Freemium
  • SQL practice problems from basic to advanced.
• LeetCode - SQL Freemium
  • SQL interview problems and solutions.
• StrataScratch Freemium
  • Real SQL and Python interview questions from FAANG companies.