At youth level, Sèrge was part of Portuguese club SC Braga’s U-19 team. In 2013, he moved from Braga’s youth setup to AD Nogueirense where he spent a year. Over the next few years, Kevyn spent a season each at a number of clubs which were competing in the second and third tier (semi-professional) of Portuguese football.
In 2018-19, Sèrge moved abroad to Libya with Al-Ittihad and joins Mumbai City FC from the Tripoli-based club. The centre-forward who can also play as a second striker has been capped four times for the Gabonese National Team.