An Indonesian citizen born in Palembang on August 18, 1972, he completed his Master's degree in Financial Management at Binus Business School in 2023. Throughout his career at WIKA, he has achieved many accomplishments in the field of construction and buildings.

Sumadi has served as the Chairman of the Board of Commissioners of PT Wijaya Karya Bangunan Gedung Tbk since 2022, Senior Vice President of the Finance Division at PT Wijaya Karya (Persero) Tbk from 2022 to 2024, and General Manager of Accounting & Tax from 2020 to 2022. At the 2024 Annual General Meeting of Shareholders (AGMS), Sumadi was appointed to the position of Director of Risk Management and Legal Affairs at WIKA. Subsequently, based on the decision of the 2025 Extraordinary General Meeting of Shareholders (EGMS), he was appointed as Director of Finance at WIKA.