Born in Australia, Girdwood-Reich played junior football in Sydney but also had a short stint with St Johnstone in his early years. He signed with Sydney FC at the age of 12.

Coming through the system with Sydney, Girdwood-Reich reached the Sydney FC II side in 2020, where his development continued for two years before officially being moved up to their first-team. He made his debut in 2022 in the Australian Cup before making his A-League debut a couple of months later. He played 19 games that season for the first-team, including every minute of their Australian Cup campaign, which concluded with Sydney and Girdwood-Reich lifting the trophy.

He picked up the Sydney FC Rising Star Award at the 2022 Sky Blue Awards night for his promising start in a Sydney FC jersey. By the start of the 2023 season in Australia, Girdwood-Reich was a starter for Sydney and started 23 matches, scoring his first goal for the club in February.

His performances earned him not only a spot in the PFA Players’ A-League Team of the Season but also a move to MLS side St Louis City in the summer of 2024, moving for an undisclosed fee, with reports suggesting the move broke the transfer record for Sydney FC.

With St Louis already midway through their MLS campaign when Girdwood-Reich arrived in July, he featured ten times in MLS in 2024, earning his first start against Los Angeles FC in October.

With the MLS campaign kicking off in early 2025, Girdwood-Reich’s appearance count for St Louis rose to 23 before he joined Auckland FC on loan in September 2025. The A-League season kicked off the following month, with the defender featuring in all but one match for his side. Girdwood-Reich caught the headlines in a 5-0 win when his strike from over 80 yards out against Wellington Phoenix found the back of the net.

Auckland went on to win the A-League Men’s Championship with a 1-0 win over his former side, Sydney FC.