Born in Panama City, Lenis travelled to Spain in early 2020, going on trial with lower-division side CD Alcalá.[3] After not being offered a contract, he joined amateur side CD Rabesa, where he scored four goals in seven games before returning to Panama.[1]
Lenis was called up to the Panama under-23 side for the 2023 Maurice Revello Tournament, and went on to score in the final as Panama beat Mexico to win the tournament for the first time.[6]
Called up by manager Thomas Christiansen to the senior squad in August 2023, Lenis marked his full international debut with two goals as Panama beat Bolivia 2–1 in a friendly game on 27 August, with Christiansen describing his performance as "spectacular".[7]