[4] Heuer Fernandes' youth career included stints at VfL Bochum and Borussia Dortmund.

[14] For the 2019–20 season, Heuer Fernandes moved to league competitor Hamburger SV for €1.3 million, with whom he received a contract that ran until 30 June 2022.

For the next match on 31 May, Pollersbeck returned in the HSV goal, while Tom Mickel remained the backup and Heuer Fernandes was not considered for the matchday squad for the first time since his move.

Under him, Heuer Fernandes was initially the starting goalkeeper again, after which Pollersbeck moved to French Ligue 1 club Lyon.

[21] On 1 December 2023, Heuer Fernandes scored a bizarre own goal during the Hamburg derby against FC St. Pauli.

In an attempt to clear his lines following a miscued back pass from Guilherme Ramos, he inadvertently struck the ball into his own net, resulting in a 2–2 draw.

[22][23] On 15 October 2012, Heuer Fernandes made his first appearance for the Portuguese national under-21 team in a friendly against Ukraine.