Hawken Wiki
In Hawken, users attain pilot levels by collecting XP, which is gained from battles. Everytime a certain amount of XP is reached, the user is granted the next-up pilot level. Reaching some levels gifts the player free items such as repair drones, charges, holopucks, and access to new items and internals for their mechs. There are a total of 30 pilot levels.
Pilot-levels-design

Artistic depiction of various level sigils