Born and brought up in Tenerife, Spain, Siverio started his professional career with Las Palmas with the now-HFC coach Manolo Marquez. He has since proven himself to be a natural goal scorer in the lower divisions in Spain, where he turned up for Racing Santander, breaking records and lifting them to promotion. Siverio was in search of a new adventure and joined the ISL in 2021 and was a mainstay at HFC for two, successful seasons. He registered 14 goals in 54 appearances in the last two seasons, winning the ISL trophy in the 2021-22 campaign before ending his stint with the club in 2023.