[1] During the Indonesian occupation of East Timor, Nascimento was active in an underground network, working in the areas of political agitation and international relations.

[1] After the United Nations Transitional Administration in East Timor (UNTAET) was established in 1999, Nascimento returned to his work as a teacher in the pre-secondary and secondary school in Suai.

Between 2002 and 2003, he was employed by the East Timorese non-governmental organization La'o Hamutuk, and focused his attention on the oil and gas deposits in the Timor Sea.

From then until 2006, he was engaged by the international humanitarian agency Catholic Relief Services (CRS) as a project manager for the Peace Building / Dezenvolvimentu Paz program.

[1][3] In February 2001, together with Álvaro do Nascimento [de], he received training in leadership and local administration while visiting Suai's Australian sister city of Port Phillip.

[4] In the elections to East Timor's interim Constituent Assembly in 2001, Nascimento achieved 22.5% of the vote for Suai District Representative, but was defeated by the Fretilin candidate.

[6] In the 2012 parliamentary election, Nascimento moved back to seventh place in the PD's electoral list, and was re-elected.