Startups and Companies with Coding Challenges

Many startups and companies create coding challenges to find engineers and developers that are capable and creative in algorithms and code. This is a great opportunity to get noticed by these companies.

Startups/Companies
Quora
Evernote

There are also other sites that allow you to compete or practice code.
Other Sites
Project Euler challenges you in mathematics and algorithms.
TopCoder has open competitions where you can win prizes.

If I don’t have one listed, please comment below.