Jiménez is an international relations specialist by profession.
In 1983, while still attending Law Faculty, together with other students, she set up the Socialist Students Association.
She joined Juventudes Socialistas de España, Spain’s Socialist Youth and was a member of its International Relations Committee.
Jiménez joined the PSOE a year later.
Jiménez chaired the International Relations Committee of Spain’s Youth Council and served on its Permanent Committee (1984–1986).

She was the Spanish representative on a North American NATO Youth Exchange Program (1989) and headed the 'New Programs and Development' department of the Spanish delegation of the American Field Service.
Jiménez also helped run the Office of the Secretary General of the National Commission for the Fifth Centennial of the Discovery of America.

Between 1990 and 1992, Jiménez lived in Equatorial Guinea, working as a Professor-Tutor in Political Law at the National Distance Education University (UNED) and at the Spanish College in Bata.

From 1996 to July 2000, Jiménez served as the Officer in Charge of Political Relations with America in the PSOE's International Relations Secretariat and, from 1997, as an advisor to ex Prime Minister Felipe González when he was chair of the Socialist International’s Global Progress Commission.
She later served as her parliamentary group's spokesperson on foreign affairs.

In 2003 Jiménez was chosen to be PSOE's candidate for the Mayor of Madrid, but prior to the election was called to other duties in a new post in the Foreign Ministry as Spain's Secretary of State for Ibero-America.
In March 2008 she was elected to the Spanish Congress representing Madrid but resigned after only a month.
Jiménez is an international relations specialist by profession. In 1983, while still attending Law Faculty, together with other students, she set up the Socialist Students Association. She joined Juventudes Socialistas de España, Spain’s Socialist Youth and was a member of its International Relations Committee. Jiménez joined the PSOE a year later. Jiménez chaired the International Relations Committee of Spain’s Youth Council and served on its Permanent Committee (1984–1986).
She was the Spanish representative on a North American NATO Youth Exchange Program (1989) and headed the 'New Programs and Development' department of the Spanish delegation of the American Field Service. Jiménez also helped run the Office of the Secretary General of the National Commission for the Fifth Centennial of the Discovery of America.
Between 1990 and 1992, Jiménez lived in Equatorial Guinea, working as a Professor-Tutor in Political Law at the National Distance Education University (UNED) and at the Spanish College in Bata.
From 1996 to July 2000, Jiménez served as the Officer in Charge of Political Relations with America in the PSOE's International Relations Secretariat and, from 1997, as an advisor to ex Prime Minister Felipe González when he was chair of the Socialist International’s Global Progress Commission. She later served as her parliamentary group's spokesperson on foreign affairs.
In 2003 Jiménez was chosen to be PSOE's candidate for the Mayor of Madrid, but prior to the election was called to other duties in a new post in the Foreign Ministry as Spain's Secretary of State for Ibero-America. In March 2008 she was elected to the Spanish Congress representing Madrid but resigned after only a month.
Trinidad Jiménez