Jaouen's stock rose significantly during the 2024-25 campaign when he joined USL Dunkerque on loan. During his time in the north of France, he played a pivotal role in guiding the club to the semi-finals of the Coupe de France and was instrumental in their push for promotion from Ligue 2, which they narrowly missed out on.
Upon his return to parent club Reims, he was thrust into the starting lineup following the club's relegation from the top flight. While Reims ultimately failed to secure an immediate return to Ligue 1 this season, Jaouen’s individual performances as their established number one remained a highlight, further cementing his reputation as a future international.