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The only proper job the Doctor's had that we know of is his work for UNIT. He began working with UNIT during the time of the Second Doctor ("The Invasion") & the Third Doctor ("Spearhead from Space" onwards).  These incarnations were employed as UNIT's Scientific Advisors during their time.  The Doctor never officially left UNIT ("The Sontaran Stratagem") and occasionally returned to help the organisation later in his life ("The Sontaran Stratagem"/"The Poison Sky", "The Day of the Doctor", "Death in Heaven").