There is only one way to become a certified Umbraco developer - by attending one of the many Umbraco training classes. Here developers get up to date knowledge from qualified trainers, ensuring that an Umbraco certified badge actually stands for a certain skillset and knowledge.
Please choose the version of Umbraco you are looking for certified developers for.
Umbraco 7 certified developers
Latest major version of Umbraco, fully supported by the Umbraco HQ and in active development. Originally released in December 2013, actively maintained with multiple releases in 2016
Umbraco 6 certified developers
Still supported with security patches, no new features are added to this version of Umbraco. Originally released in January 2013, latest release in March, 2016