In 1995 she won an IADB scholarship to study at the University of Chile's Faculty of Industrial Engineering in its Master of Management and Public Policy program.

[2][3] In 1999 she completed training in international health at the Pan American Health Organization in Washington, D.C.[2] La Rosa's foray into public management began in 1991 when she was appointed director general of the National Population Council's National Youth Program for the Presidency of the Council of Ministers [es] (PCM), from which she promoted the development of multisectoral policies for youth.

[3] Later, she worked as a full-time professor at the PUCP Faculty of Social Sciences, a position that includes teaching at its School of Government and Public Policy.

[5] On 2 April 2018, Liliana La Rosa was sworn in as Minister of Development and Social Inclusion of Peru, joining the Villanueva cabinet of Martín Vizcarra's government.

[2] Her appointment caused controversy in some sectors, recalling that she had been a member of the Broad Front, a conglomerate of leftist groups that had contributed to the fall of the previous government of Pedro Pablo Kuczynski.