Characters don’t pick a class at character creation in Convergence. Instead, they spend their exp in class areas. Each class area has two specialities. For example, Warrior has Defender and Bruiser. The more time you spend in a class, the more skills are unlocked for you. However, nothing is stopping you from exploring other areas with your character if you wish. Spending 10 exp entirely in a class is considered taking a level in it. So, a character with 50 EXP spent in Warrior skills is considered to have taken 5 levels of Warrior.
A list of the current skills for Convergence can be found here.