In April 2015 he was awarded a senior contract with Leinster following completion of his time in the academy, having previously played with the Leinster senior team, making his debut in February 2014 against Zebre.

[1][2] In October 2020, he was named in the Ireland squad by coach Andy Farrell for the remaining matches of the 2020 Six Nations Championship.

[3] He made his debut as a substitute against Italy on 24 October 2020.

[4] On 8 May 2024, Bryne would leave Leinster to travel to Wales to sign with capital region Cardiff for the 2024-25 season.

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