He currently plays for UMF Njardvik, wearing the number 4 shirt. He plays primarily as a Defender. His preferred foot is Right.

His most recent move was a Loan from UMF Njardvik to Víkingur Reykjavík U19 on 2027-02-03.

Throughout the Iceland Besta-deild karla 2025, Haraldur Agust Brynjarsson featured in 16 matches, averaging 0 tackles, 0 interceptions, and 0 clearances per game, while blocking 0 shots per game.