転職 and 転勤: changing jobs and transferring locations
Distinguish a job change from a work-location transfer and a contemplated change from a completed move.
Changing work or employer
転職, read てんしょく, means changing one's job or employer. 別の会社に転職しました。 means moving to another company.
転職を考えています。 says that the person is considering a job change. It does not report resignation or starting at a new company.
Changing work location
転勤, read てんきん, means a transfer to another work location by an employer. 大阪の支店に転勤しました。 means transferring to the Osaka branch.
転勤が決まりました。 says that the transfer was decided. It does not establish that moving home or starting work there is complete.
Scope of the move
同じ会社の別の支店に転勤しました。 means transferring to another branch of the same company. Do not change the employer.
転職してから、半年後に転勤しました。 says that the person changed jobs and transferred six months later. These are not a single same-day event.
Did the employer change in 同じ会社の別の支店に転勤しました?
Show the answer and why
No. The branch changed within the same company.