Mechanic: Installs new equipment and keeps the equipment running.

Engineer: Manufactures new equipment and, with a mechanic's help, designs new things or improvements for things. Often works as a mechanic as well, as making new equipment isn't a full-time job for a small commune.

Botanist: Works with plants, usually food, medicinal, or otherwise useful plants.

Biologist: Works to keep the habitat suitable for life, and to improve its suitability. Also works with various lifeforms to make them work better together.

Doctor: Sees to the health of the people, and sometimes animals, though they are expensive to get and keep. Usually a hybrid job, as only larger communes can keep them busy enough for it to be a full time job.

Chemist: Works with chemicals to produce the chemicals that the group needs. Sometimes specializes in biological or another specific form of chemical.

Roboticist: Builds, maintains, and programs robots and computers.

Geologist: Studies the rocks and soil of Mars and looks for natural resources. Usually in charge of mining.

Worker: Does manual labor around the commune, including driving heavy equipment to move heavy goods.

Builder: Designs and builds the various modules, domes, or other structures to expand the commune's pressurized areas.

Maid: Cleans and cooks for the commune. Usually only found in larger communes.

Housemate: A position that arose due to the scarcity of women on Mars, they are like a house wife/husband, but without a marriage, and their "marital duties" are usually extended to multiple people, if not everyone in the commune. Usually a woman, and they are usually surgically sterilized and very "open" sexually, for obvious reasons. Usually a transitional job or a hybrid job while they learn a more useful job.

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Name: James Dumont

Appearance:

Age: 25

Role: Engineer/Mechanic

Skills: designing machines, science, electronics

Personality: He's a bit scatter-brained. He stayed with his parent's commune until they kicked him out, but he's still not sure what he really want's to focus on it life. He's good with machines and electronics, though, so he decided to advertise himself as an Engineer and Mechanic when he needed to find a new commune.

History: He was born on Mars in an artificial womb, as women were too scarce on Mars at that time, and his father too poor to attract one for a natural birth. After the doctor removed him from the canister he was given to his father, who took him back to his commune to be raised by the group. Eventually another woman joined the commune as a Roboticist and fell in love with his father. The two got married and she effectively became his mother.
When he got old enough he started helping his mother repair the robots and even started figuring out ways to alter them. At 16 he started helping the mechanics outside as well, and found that he preferred the more versatile array of machines outside to the repetitive robot technology he'd been repairing. He continued to work whichever of those jobs he needed to do, but one month ago they told him that he would either have to officially join the commune or leave. He was getting tired of the area around his parent's commune and craved the challenge of starting again in a new location, so he decided to leave. They gave him an old truck and some emergency supplies and said goodbye. He picked up a friend from a nearby commune, connected her trailer of supplies to the truck, and they left for the area of the new commune.

Vehicle/equipment: old truck; tablet computer with diagnostic programs as well as games and other personal programs; emergency rations and a first aid kit (in the truck); basic Martian pressure suit

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Appearance:

Age: 23

Role: Housemate/Botanist

Skills: Cooking, growing plants, she's got a general knowledge of the life support and power systems, though she can't do much more than adjust settings.

Personality: She's laid back, not easily getting stressed and highly optimistic. In her free time she likes to make crafts out of whatever she can find.

History: Her mother was already pregnant with her when she joined the commune where she grew up as a housemate, and she doesn't know who her father is. Her only "siblings" were the children of the other people in the commune. She was raised by the group, mostly helping her mother, but sometimes helping the commune's botanist in the hydroponics bays. They occasionally traded with the other communes in the area, selling the metal they produced for the goods the other communes produced.
She met James one time when his father came to their commune to trade plastic they had made for metal. They became friends, as both of them didn't take things as serious as the others, and started communicating with each other periodically.
When she heard that he was going to leave to start a commune, she decided to join him, as she was tired of the too-serious people of her home commune. She convinced them to give her a trailer with some basic modules and equipment, and joined James when he came by to pick her up.

Vehicle/equipment: Trailer of equipment/supplies/modules; personal computer; small crate of crafting supplies; small crate of clothes, as she works inside most of the time; basic martian pressure suit.