Survivors in the desolate wastes tend to hone a handful of skills, and work together with others to optimize their chance of survival. Characters rarely find success in becoming a jack of all trades, and may find the wilds more deadly if they do not focus their efforts. Because of this most survivors fit into one of four main professions, which each specialize in one job.

Slayer - Hunting: Harvest components from defeated beasts.
Slayers are known for their physical prowess and melee abilities. As the front line of combat, they defend their group and tank damage.  They have bonuses to combat skills and vitality.

Sentry - Alchemy: Isolate the special properties of items, and transfer them to others.
Sentries adapt to the new world, honing both claws and magic to battle. They learn about the properties of the new world and use it against their enemies. They are more perceptive than most and have bonuses to sensory and face skills.

Specter - Crafting: Turn materials into tools, structures, and more.
Specters focus on the Ley energies of the world, capable of great feats of magic and construction. They are specialized in ranged combat, often creating contraptions to attack from afar. They focus more on their craft than brute strength, and have bonuses to utility and hobby skills.

Survivalist - Searching: Harvest a variety of materials from the land.
Survivalists are the best at holding their own in the wastes. The only class specializing in stealth, they excel at avoiding and escaping combat. Survivalists are excellent travelers, scouts, gatherers, and even at times assassins. They have various questing and movement skills bonuses.

Characters that have not yet chosen a professions to specialize in are considered "Standard".

Standard - Hunting, Alchemy, Crafting, Searching: May attempt any job, but must work without the carefully honed skills of the specializations, gaining no bonuses to these jobs.
We all have to start somewhere, and for most, that starting point is the Standard profession.  These cats are masters of nothing, but are not limited to any specific work.  They can try all things, but must work without the bonuses a more specialized cat receives. 

Cross-Profession Contracts:
Contracts run outside the profession must be done with the related skill check with a DC 15.  If the job is successful, but the skill check fails, the item will receive 1d8 fragility.  The item is easily damaged, and if it loses all fragility points, it breaks.  Items crafted from fragile items inherit the lowest fragility score.  Potions brewed from fragile items will see their effects decrease by 2 points per fragility across all brewing components (Minimum 0 effect).  Fragility must be tracked by the player.