The jobs disappear from the jobboard once they are started. Even if you didn`t complete the mission.There should be a way to repeat them like the missions.Anyone know?

I think they appear randomly so it will appear again at some point in the future.I know that does not help much though if you want to repeat it at that precise moment.

Well, the fun of it all is that the jobs come and go as in real life...! They are new every day and in real life you also won't be able to redo a job. I like it. Specially because you also have missions and challenges that CAN be done over and over again.