[1] Previously, she was an assistant to the Director-General and coordinator of sustainable development programs at hydroelectric dam Itaipu Binacional, and a communications and institutional affairs advisor at electric utilities company Eletrobras.

Janja began working at hydroelectric dam Itaipu Binacional on 1 January 2005 and was an assistant to the Director-General, as well as coordinator of sustainable development programs.

[5][6] They remained together when Lula was arrested and incarcerated for corruption and money laundering at the Federal Police headquarters in Curitiba in April 2018.

[citation needed] Janja has regularly participated, alongside her husband, in meetings with heads of states and official events.

"[14] In 16 November 2024, during a speech about fake news at the 2024 G20 Rio de Janeiro summit, she sweared at Elon Musk, saying: "I'm not afraid of you.