Jobber \Job"ber\, n.

1. One who works by the job.

2. A dealer in the public stocks or funds; a stockjobber. [Eng.]

3. One who buys goods from importers, wholesalers, or manufacturers, and sells to retailers.

4. One who turns official or public business to private advantage; hence, one who performs low or mercenary work in office, politics, or intrigue.

Source: Webster's Revised Unabridged Dictionary (1913)