How Things Work: Keeping the Streets Clean
During the Middle Ages, street maintenance was considered the duty of individual property owners but such maintenance was uneven (that was a pun) so the City of Coventry (which is north of London) has hired street pavers for regular street maintenance and charge the property owners for the service. By 1474 the job of "paver" will be a recognized occupation and the city pavers of London will become a formal organization in 1479.  
The Grand Sergeant: The Next Best Thing to Immortality
There is no good way to say this so let's quote the historian directly regarding jobs and the reason they exist in the 15th century... it's a religious thing...
In matters of utility or of ceremony medieval authority creates a special organ for every function, because it regards the function as an idea and considers it as an actual thing. The “grand sergeant” of the king of England comprised a dignitary whose office it was to hold the king's head when he crossed the Channel and was suffering with sea-sickness. A certain John Baker held this office in 1442, and after his death it passed to his two daughters.
-- Johan Huizinga, The Waning of the Middle Ages
This Year in Wikipedia
Year 1442, Wikipedia.
- Jorgensen, Dolly. Cooperative Sanitation: Managing Streets and Gutters in Late Medieval England and Scandinavia. Technology and Culture, Vol. 49, No. 3, Water (July 2008), pp. 547-567 (JOURNAL) Quote: "Even though the cities demanded the individual participation of residents in maintaining the streets, they did not necessarily think that every individual would physically install new pavement. Instead, the Coventry council expected residents to pay for the services of professional pavers. In 1442, it ordered that the mayor hire street pavers, whose wages would be paid by collecting money from all free tenement-holders."
- Coventry - Wikipedia, 2014 [last update]
- Huizinga, Johan. The Waning of the Middle Ages. New York: St. Martin's Press. 1985. pp. xx-xx. ISBN 0312855400. (BOOK) Quote: "All that acquires a fixed place in life is considered as having a reason for existence in the divine scheme."