[6] Upon being released by Motherwell, he was quickly signed on a permanent contract by Stenhousemuir, who he had two previous loan spells with, for the 2013–14 season.
[10] However, after the club's relegation from the Scottish Championship, Devlin announced he would be leaving Ayr in May 2017 at the end of his contract.
[18][19] On 1 October 2024, he was called-up by Scotland for the first time for UEFA Nations League matches against Croatia and Portugal.
[20][21] He made his debut as a substitute against Portugal at Hampden, making a crucial block late on in the game to deny Rafael Leão.
[22] In June 2020, Devlin agreed to join the under-20 coaching staff of West of Scotland Football League side Rossvale.