On 9 March 2024, Syahmi was signed by Negeri Sembilan on a season-long loan deal. On 15 June 2024, he made his professional debut for Negeri Sembilan in FA Cup match in a 4–0 away defeat against his parent club, Selangor. He made his move to Negeri Sembilan permanent on 23 June 2025.
International career
Youth
Syahmi has represented Malaysia at various age levels, including at [Malaysia national Malaysia national under-19 football team|under-19 football team|under-19] and under-23 levels. He represented the squad under-19 at the 2022 AFF U-19 Youth Championship, which helped them win the tournament. He also included in Malaysia's 26-man squad under-19 for the 2023 AFC U-20 Asian Cup qualification. In middle-August 2023, Syahmi was called up by the Malaysia under-23 team for the 2023 AFF U-23 Championship tournament.