I am pretty late for this, but I believe I can add some details, that may be interesting for people interested in how work was organized in small medieval community in central Europe.
Most answers are right about majority of population being farmers and the live rhythm of such society would be therefore dictated by the field works. Meaning it will be seasonal.
"On season" essentially everyone will be doing fieldwork. We need to remember that most of land around the village belongs to the "manor" and had to be worked first, only small portion of the land would be allocated for villagers needs. So amount of work would be substantially greater than resources available for villagers.
"Off season" would be dedicated towards maintenance, repairs, crafting of tools and processing of harvested resources. While men would work the wood, meat, leather and metals, women would be dedicated to textile production. In many parts of the Europe there are surviving folk traditions concerning these female "off season activities".
As small community as 100 people would acquire all non-food needs during these "off season" activities. The for iron for tools (the most obvious elephant in the room) would be obtained through the trading. Next possibility was to extract iron from bog (if one is available, but the location of the village might be selected with this in mind), but the amount needed would not facilitate the need for specialized professional.
However there still would be specialized full-time professionals as well.
The first of them being:
The local Witch, ye olde herbalist hag, or as we call them nowadays a Midwife
Midwifes were except from fieldwork and many other activities mainly because everyone had to know at all times where to find her, when she was needed. So midwife was expected to sit home all the time waiting for emergencies. She wasn't paid per se but villagers would provide for her every need. Midwifes may have had husband or family on their own, but girls that were seen as unfit for fieldwork or unmarriable were often selected as their apprentices (possibly laying base for crooked, ugly hag of a witch myth). Midwifes tend to have knowledge about medicinal plants and were usually the only person in the village who knew the first thing about medicine and were often called for other emergencies than childbirths as well.
A Priest
If village lacked the church of its own, villagers were usually expected to visit the nearest settlement that did. If the the distance was too great, villagers would be exempt from weekly service, but were still expected to visit during the holydays. Given (not only by) that the most important holydays (Christmas) are in the middle of the winter there is no surprise that even the smallest villages would seek their own priest.
In medieval Europe villages governing body would petition their lord, who would send the request to the nearest bishop. Bishop would sent someone to inspect the village and if there was an appropriate building to serve as as temple he would appoint a new parish and assign a priest.
Villagers were expected to provide a priest with his own house and allocate some of the village land to the parish. Villagers would work the manorial lands first, parish lands second and only then their own land. The "salary" of a priest being the produce from the parish land. Priest was also given servants (older women, usually widows took turns in this role), doing the cooking and housework for the priest.
Governing body
Villages were usually governed by the councils of elders. This wasn't full time profession, just the group of men who were trusted (enough) by other villagers to make decisions. These councils were sometimes 'hijacked' by the wealthiest or most influential villager, making the role more centralized over time, but with 100 inhabitants there was no way governing would take full of his time.
Only reason how it would become a "proffesion" at this scale is if the lord needed, for some reason, better control over the village. In that case he may name a mayor or a bailiff, who would be paid directly from lord's coffers.
Herders
While one can give the task of watching a small flock of gees or a odd cow to random child, if the villagers wanted to maintain some more substantial herd the job was preferably given to someone more responsible. But the difficulties of herding doesn't end with the manpower. Most of land around the village would be dedicated for crops (with fallow fields being harvested for winter fodder) a available grazing land had to be sought for in the greater distances. This was usual mainly with sheep as they can graze on land unsuitable for other livestock.
Shepherds would take the animals to the hills in spring and herd them back for wintering and culling. They were expected to return in the Fall with more animals than they left with in the Spring otherwise they were free to manage the herd as they seen fit. They were paid in whatever they were able to extract from the animals over the Summer and in share of meat and wool after they returned.
Only men left with the animals leaving their families waiting in the village and if there was some minority in the village this work may fall on them. (that's how Wallachian become the synonym for shepherd in area of medieval Hungary)
Others?
If village was founded in order to extract some specific resource, then there would be of course professionals for that purpose, with the rest of village basically providing for them, but in that case a lot of thing would be imported in order to get the industry running.
Mining settlements were frequent example of this. Such settlement needed a lot of fuel, that was provided by one of the most prolific non-farming professionals - The charcoal burners.
Another example might been millers. If your villagers wanted to bank a bit on the neighbors they might petition the lord for a right to build a mill. This needed the lords permission and was highly taxed, but still very profitable as one mill could provide service form many villages and village that went through the trouble of getting permission had the monopoly. Illegal mills were typically burned (with miller and his family still inside in some jurisdictions).