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Giller came to the Universidad Católica youth system at the age of 11. Gillier made his debut with the first team in a friendly match against the Argentine club River Plate on 9 September 2023. At league level, Gillier made his professional debut in a match against Ñublense on 23 February 2024.
On 2 July 2025, Gillier moved to Italy and signed with Bologna for five seasons. On 8 July, he joined on loan to Major League Soccer club CF Montréal until the end of the 2025 season with an option to extend for the next season. On 5 August, Gillier made his debut with Montreal, where he stopped an early penalty kick before giving up two goals in a 2–1 loss to Club Puebla of Liga MX.
