[Tips] – Challenges for developers to improve themselves, to trainee and to prove their skills

You can learn and improve yourself doing this challenges for developers. Also, you can  use these challenges to prove your skills and achieve better positions in the labor market.

codility

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https://codility.com/

In this website you can find lessons and challenges for developers, and if you do a good job a can find a better positions in the labor market.

Lessons :
https://codility.com/programmers/lessons/

Challenges:
https://codility.com/programmers/challenges/

topcoder
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https://www.topcoder.com

In this website you can find a lot of challenges :

https://www.topcoder.com/challenges/?pageIndex=1

You can learn new skills, improve your code and have a contact with the community.

codefights
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https://codefights.com/

Test your skills VS friends, co-workers and companies. Join a community of 300,000 devs!

codewars
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http://www.codewars.com/