Coding is a highly in-demand skill in today's technologically advanced world. Several online resources can help developers of all experience levels (from novices to veterans) gain valuable insight into the world of coding and improve their abilities. Furthermore, coding skills can work wonders for a tech professional's career.

The coding platforms offer challenges, tests, quizzes, and interview advice tailored to each level. Additionally, it aids professionals in landing prestigious tech jobs and succeeding in their following positions.

Coderbyte

Coderbyte is a platform best known for its wide variety of coding challenges. The difficulty of these challenges varies, and We can attempt them in the platform's online editor. In terms of employment, CoderByte provides a technical screening product to assist businesses in recruiting more quickly and effectively.

Furthermore, with automated grading, the platform offers challenges in various areas, including algorithms, front-end, back-end, and database. Moreover, it prepares students for real-world interviews using expert content and solutions from leading technology companies.

Codewars

The Codewars platform allows users to participate in small coding exercises known as 'kata.' Each kata created by the Codewars community is to help participants improve their coding abilities.

In addition, the platform supports over 55 programming languages to learn. We can solve the 'kata' in the browser and use the test cases (TDD) to monitor the participants' progress. After each kata, participants can compare their solutions with peers to gauge their progress and better understand the issues.

HackerRank

HackerRank is a platform for consumers and businesses that focuses on competitive coding. We can complete programming challenges at HackerRank in various programming languages, including Java, C++, Python, SQL, and JavaScript.

Furthermore, the platform also offers challenges on data structures such as Arrays, 2D Arrays, Dynamic Arrays, Sparse Array, Array Manipulation, and C (Functions in C, pointers in C, conditional statements in C, Bitwise operators, and more), as well as interview preparation kits.

FreeCodeCamp

FreeCodeCamp provides young professionals with credible certifications to enhance their skills and explore opportunities in technology. Each certificate requires the completion of five projects as well as level-specific tests.

FreeCodeCamp's most in-demand certifications include JavaScript algorithm and data structures, data visualization, back-end development and APIs certification, data analysis with Python certification, and machine learning with Python certification, among others.

CodeChef

Directi, an Indian software company, launched CodeChef in 2009 as an educational initiative for programmers. Unacademy recently acquired it, and it now provides practice in basic programming, arrays, strings, binary structures, data structures, dynamic programming, graphs, and segment trees.

Every month, CodeChef hosts several challenges to encourage competitive programming.

CodinGame

CodinGame offers challenge-based programming training through games, puzzles, and competitions in over 25 languages. Through accessible, medium, challenging, and strenuous exercises, CodinGame's resources allow you to improve your programming skills, learn new concepts, and interact with other coders.

The leaderboard and prizes on CodinGame help you gain recognition from your peers and track your progress. In addition, developers' free live streams, blogs, and discussion forums supplement recruiters' sourcing, screening, and retention programs.

Geektastic

Geektastic's human-reviewed technical assessments enable businesses to create coding challenges for talent acquisition and engineering team training. If you have coding experience, you can join Geektastic's reviewer community to develop and test challenges — and get paid to evaluate candidates' performance.

Java, Python, and PHP code challenges are available. Geektastic also provides Java, Javascript, and basic coding skill assessments. Joining as a developer is free, and flexible pricing accommodates businesses of all sizes.

LeetCode

LeetCode's programmer community has access to over 2,250 practice problems. Individual challenges in algorithms, database structures, and dynamic programming supplement overall study plans.

LeetCode's programming skills study plan combines three modules with varying degrees of difficulty. LeetCode supports 14 programming languages and includes a playground tool for testing, debugging, and writing code.