Santos Born in
Santos,
São Paulo, Kaiky joined
Santos' youth setup from local side Portuários. Initially playing
futsal, he started to appear in the club's football categories at the age of nine. On 21 December 2020, Kaiky signed his first professional contract with
Peixe, agreeing to a three-year deal. He made his professional debut the following 28 February, starting in a 2–2
Campeonato Paulista away draw against
Santo André. On his
Copa Libertadores debut on 9 March 2021, Kaiky started and scored his first professional goal, netting the winner in a 2–1 home success over
Deportivo Lara; aged 17 years, one month and 25 days, he became the youngest Brazilian to score in the competition and second overall, only behind
Juan Carlos Cárdenas; his record was broken in the following month by teammate
Ângelo. Kaiky made his
Série A debut on 29 May 2021, starting in a 0–3 away loss against
Bahia. On 27 April 2022, after establishing himself in the first team squad, he renewed his contract until December 2026.
Almería On 11 July 2022, Santos agreed to transfer Kaiky to Spanish
La Liga side
UD Almería for a rumoured fee of
€7 million. The move was officially announced eight days later, with the player signing a six-year deal. Kaiky made his debut abroad on 14 August 2022, starting in a 2–1 home loss to
Real Madrid. He scored his first professional goal on 26 August 2023, netting a last-minute equalizer in a 1–1 away draw against
Cádiz. On 1 February 2024, Kaiky was loaned to
Segunda División side
Albacete for the remainder of
the season.
Shabab Al Ahli On 26 July 2025, Kaiky was transferred to
UAE Pro League side
Shabab Al Ahli. ==International career==