I am unsure if you are just asking for jobs related to Minecraft of work in general. However if are you looking to earn money while working with Minecraft there are three main ways, coding, building and drawing.
Professional builders can get paid anything from $20-$1,500+ for a single build. Of course the larger amounts of money are for jobs which would only be possible with a team, and therefore you would not actually be paid $1,500 yourself.
Professional developers can be paid in multiple ways, either by the plugin, by the hour for a single plugin, or some servers hire developers as a full time position and pay them a salary. Developers can earn anything from $50 for a plugin to hundreds of thousands a year as full time server owners or developers for large servers.
Artists, can be a very rewarding job if you are truly talented, with some server owners and youtubers willing to pay hundreds of dollars for a single banner or logo.
Although remember due to each of these jobs being freelance work, it is incredibly hard to get work, and should not be seen as a steady source of income. To even stand a chance of getting noticed in this saturated market you will need a wheelbarrow of talent and heap of previous work to show people, before they will even consider paying for your services.