Devskiller!

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.

A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.

Duel with friends and foes in head-to-head programming battles!

Coderbyte is a place built for anyone to practice and perfect their programming skills. Challenges are added almost every day so you can work on applying your algorithmic thought process on any problem you want at anytime. Coderbyte is built on improving your ability to work on common logic, mathematical, and algorithmic problems you might one day encounter.

Achieve code mastery through challenge.Improve your skills by training with others on real code challenges

Topcoder gathers the world’s experts in design, development and data science to work on interesting and challenging problems. Members are provided with opportunities to demonstrate their expertise, improve their skills, and win cash, while helping real world organizations solve real world problems.

The programmer testing solution that matches your job descriptions and helps you hire great developers faster.

Attract and test your applicants by giving them cool challenges. Last man standing is the candidate you are looking for.

Assess your candidates technical skills with automated online coding interviews. Save Time, Reduce Recruitment Costs and Hire Better Developers

Businesses are run by people. It is the quality of the people that work at any given workplace that determines the success/failure of that particular company. So, how do you ensure that you have the best people working with you at all times? By taking a page out of the book that is Interact, and ditching the traditional interviewing process.

Kattis helps companies make safer recruitments and attract the best developers with its dynamic challenge platform.

Create your interview or use our templates for FREE. Interview as many candidates as you want for FREE. See candidates' answers and scores for FREE.