Viana began her refereeing career in 2005 as an amateur referee, and became the first woman to be assigned to matches of the
Premier League of Eswatini in 2007. Following her
FIFA designation, Viana was assigned for a match at the
2016 Women's Africa Cup of Nations in
Cameroon. She oversaw the game between
Kenya and
Nigeria at the
Limbe Stadium, which ended in a Nigerian 4–0 victory. Viana was a fourth official at the semifinal between Nigeria and
South Africa (1–0). After the match, Ghana's coach
Bashir Hayford accused Viana of being "intimidating" to his players and that the game was played "80% by the referee (Viana)." and a
repechage game between
Senegal and
Tunisia at the
Moulay Hassan Stadium, which finalised in a Senegalese victory on
penalties. Beyond her CAF competitions, Viana was chosen as a
VAR official for the
2022 FIFA U-17 Women's World Cup in
India, Viana was appointed as assistant VAR for the men's
2025 Africa Cup of Nations final between
Senegal and
Morocco in Rabat on 18 January 2026. == Personal life ==