Construction Simulator has an experience point (XP) system. The more XP you earn, the higher levels you can attain. Leveling up unlocks certain aspects of the game, such as more foremen to handle additional contracts, more workers, bigger contracts, etc.
Here is the progression:
|XP Level||Title||Description||XP Required|
|0||Beginner||Well show what you can do||100 XP|
|1||Inexperienced Apprentice||Unlocking new construction area: Village||500 XP|
|2||Average Apprentice||From now on, one more contract will be offered||1000 XP|