The midfielder arrived in June 2026, following the expiry of his contract at Barnet, having captained the Bees to the 2024/25 National League title and to an eighth-place finish in League Two.

After coming through the ranks of their youth setup, Hartigan was the first player born in the 2000s to feature AFC Wimbledon, going on to make more 100 appearances in Southwest London.

After the Wombles suffered relegation in 2021/22, Hartigan made the move to Mansfield Town where he featured regularly during the first few months of the League Two season, before being sidelined with injury.

In August 2023, he joined Barnet on loan in the National League, going on to earn Players’, Manager’s and Young Player of the Season in a standout campaign, before signing a permanent contract with the club in the following summer.

Appointed as captain, Hartigan led the Bees to the title with 10 assists and two goals and made another 32 appearances for Dean Brennan’s side upon their return to the EFL last season.