Workers craft equipment using the workstations placed in the shop. The tier of a worker determines the amount of skill points gained when leveling up, the amount of XP to level up, as well as the costs for hiring them and resetting their skills. Upgrading certain buildings unlocks them or raises their level cap. Workers have 2 or 3 crafting skills and mastery. For a list of interesting worker teams, see Worker Teams. All workers have a maximum level of 55(16 March 2017). For everyone but the Giant, the level of their respective buildings limits their current level cap.
Tier-1 workers have two skills. Their baseline is 5 skill points in each crafting skill and 1 in mastery. Each level grants 5 skill points. Every tier-1 worker shares a building with another tier-1 worker.