Job is the vulgar way to say travail. It’s used most of the time for little job like summer work.
Profession is your job title (boulanger, policier, journaliste, …). If profession is used for an individual, not for a work core capacity like métier

métier
job
profession

Even if they might all be translated to job in English, they don’t mean the same thing in French.

• job is used as emploi or travail. If you are unemployed and looking for a job, you can say je cherche un emploi or je cherche un job or je cherche du travail.

• métier is most of time what you learn. If you learned engineering in a school, you can say j’ai appris le métier d’ingénieur

• profession is the title or a group of métier. If you are a nurse, you can say je travaille dans une profession médicale. profession is closer (synonym) to métier.