Codechef
HackerRank
LeetCode
Coderbyte
CodeForces
AlgoExpert.io
Codewars
Interview Cake
Dobr.AI
Intervue.io
BarRaiser
Coderbyte
HackerRank
CodeChef is a not-for-profit educational initiative started by Directi more than a decade ago. We started with a dream of seeing an Indian team winning a gold medal at the ACM ICPC World Finals. In its quest for the same, CodeChef has built a self-driven community of the world's best programmers. Today more than 1.3 million competitive programmers from 180+ countries learn from CodeChef. CodeChef has been hosting monthly programming contests regularly for 10 years now. Its platform has assessed 92 million+ code submissions to date, and over 30000 organizations are being impacted by CodeCheffers worldwide. It also organizes SnackDown - one of the world's largest global programming competition whose last edition drew participation from 140+ countries. Since 2017, CodeChef has started providing India's only industry-ready certification in Data Structures and Algorithms, and 1800+ programmers have been certified under the same.
We’ve built an interview platform where candidates are assessed by working on real-world tasks—collaboratively—rather than answering standalone questions. It feels less like a test, and more like a working session.
For example, instead of asking an engineer to “explain system design,” we simulate a working environment where the candidate discusses trade-offs, builds incrementally, responds to suggestions, and iterates—just like they would on the job. The experience is dynamic and conversational, not a static test.
This mode of interviewing saves companies significant time. Today, these kinds of deep-dive interviews are conducted by busy engineers who spend 60–90 minutes per candidate. That adds up to thousands of hours per year in lost productivity—often from the same engineers whose time is already stretched thin.
Our platform delivers that same depth of evaluation—across job roles, from software to marketing to project management—without burning out the teams.
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Based on our record, Codechef seems to be more popular. It has been mentiond 7 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Have you heard of codeforces.com, atcoder.jp, codechef.com, etc? Source: over 1 year ago
Leetcode is good to learn basic algorithms because problem statements are usually straightforward. Competitive programming has much wider range of problems. Most popular sites for cp are codeforces.com , atcoder.jp, codechef.com . Source: over 1 year ago
Learn Java with hands-on experience. I personally used codingbat.com a lot, but I've heard good things about codechef.com, which appears to even have a competitive option. Source: about 2 years ago
For practicing algorithms, use any of the freely available websites like https://hackerrank.com https://codechef.com https://projecteuler.net A structured set of practice problems are available at https://www.interviewbit.com/courses/programming/ Avoid https://geeksforgeeks.org because it has a ton of material but very poor quality control. Source: almost 3 years ago
These all have sample problems to solve Hackerrank.com edabit.com codewars.com codechef.com and there are tons more. Best of luck to you. I am at about the same level myself. I really like these sites. Source: about 3 years ago
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Intervue.io - Hire better people. Faster. with live coding environment for 35+ programming languages and video calling. Send take home assignments and view reports of assignments and live interviews to make decisions
LeetCode - Practice and level up your development skills and prepare for technical interviews.
BarRaiser - We let you free up the precious bandwidth of your teams to focus on building the product & business rather than interviewing - while providing an exceptional experience to candidates applying to your company!
Coderbyte - Coderbyte is a place built for anyone to practice and perfect their programming skills.
CodeForces - Programming competitions and contests, programming community.
