Emelec were Alemán's first club, he joined their youth system at the age of 5 and went on to play senior football for them from 2013 to 2014 and made eleven appearances in the Ecuadorian Serie A.[3][4] His senior debut for Emelec arrived on 19 June 2013 against Manta, a team he would go on to join in July 2015.[2] Prior to joining Manta, Alemán signed for Técnico Universitario of the Ecuadorian Serie B.[5] He featured four times before leaving for Manta, also of Serie B.[2] For Manta, he scored five goals, including two in an 8–0 win over Deportivo Azogues on 28 November, in fourteen games as they finished 6th.[2]
January 2016 saw him join Deportivo Quito in Serie B, but he left eight months later to play for Ecuadorian Serie A team Barcelona SC.[2][3] He made his Barcelona debut on 21 August 2016 in a 5–1 victory over Fuerza Amarilla.[2] Twenty-one further appearances came during 2016 and 2017, before Alemán departed Ecuadorian football for the first time to move to Argentine Primera División side Estudiantes.[6][7] He scored on his debut for Estudiantes, netting the winning goal against Arsenal de Sarandí on 28 August 2017.[2] He left after six appearances in June 2018, subsequently scoring ten goals in three seasons back with Barcelona.[2]
In September 2020, Alemán headed to fellow Ecuadorian Serie A club Guayaquil City.[2] Nine appearances followed.[2] On 20 December 2020, Alemán agreed a free transfer to Poland with I liga side Arka Gdynia; with his one-and-a-half-year contract commencing in January 2021.[1]
On 21 December 2022, it was announced he would return to Ecuador to join the 2022 season champions Aucas in 2023.[8] After making only three appearances across all competitions in nine months, Alemán left Aucas in early September 2023.
Shortly after, Alemán returned to Poland, and on 20 September he signed a one-year contract with an option for another season with second division side GKS Katowice.[9] Alemán scored once in 15 league appearances as GKS won promotion to the Ekstraklasa after finishing the season as runners-up. On 17 June 2024, it was announced Alemán would leave GKS at the end of his contract.[10]
On 5 August 2024, he re-joined Ecuadorian Serie B club Manta.[11]
Personal life
Alemán is the half-brother of fellow footballer Javier Charcopa.[3][12]