Hi /u/DamnesiaVu,

Great question! I've actually written a bit about this before in some previous answers, if you'd be interested in looking over them:

• How was slavery in the Ottoman Empire different from slavery in North and South America?
  • Particularly the section of my answer titled "Concubines, Soldiers, and Laborers: The Many Roles of Ottoman Slaves".
• I’m a young Ottoman Sultan - what does my love life look like? How do I find new wives? Does the public care about who I’m having sex with, or who/how many women I’m marrying?
  • In which I tackle what the harem actually was and what role these women played. While our popular conception of the harem is that it was, well, a place of conception, the role of the harem and its enslaved women actually extended much further than that.
• What rights did slaves have in the Ottoman Empire? Were these rights respected by their masters?
  • This one covers a bit more of the master-slave relationship. Unfortunately, it doesn't cover the occupations or roles of slaves as much as the other two, but I figured I might as well include it if you're interested in the subject.

To more directly answer your question:

Besides harem, janissary, and eunuch slaves, enslaved peoples within the Ottoman Empire fulfilled a wide variety of roles.

Urban, domestic slaves, who were mainly confined to roles within the household were common, as were manual labor slaves, such as those making textiles, that would be sold, by their masters. Additionally, alongside the janissaries, were a similar military administrative slaves, who both participated in managing the Ottoman army and participated in the civil bureaucracy throughout the Ottoman Empire.

Surprisingly, agricultural slaves were not entirely common, but we do know that some slaves were in rural areas. Therefore, it is possible that some slaves performed agricultural work, but it was not as common as the other aforementioned occupations or roles.

If you have any further questions or would like me to reiterate something, please let me know as I'd be glad to help! Also, if you're interested in learning more about the subject, I really recommend looking into most anything written by Ehud R. Toledano, who is one of the leading academics on Ottoman slavery.