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Sefli Rivaldy Tama is a skilled Mine Plan Expert currently working at Pamapersada Nusantara since June 2022, where responsibilities include short-term planning, monitoring, and evaluating coal mining and overburden removal activities. Sefli previously served as a Centrifuge Engineer and H2S Engineer at PT Pertamina Drilling Services Indonesia from March 2021 to June 2022, focusing on the operation and maintenance of drilling fluid systems. Prior experience includes internships at PT Saptaindra Sejati and PT DAHANA (Persero), where Sefli engaged in data collection and analysis related to drilling techniques and blasting methods. Sefli holds a Bachelor’s degree in Mining and Mineral Engineering from Universitas Sriwijaya, obtained between 2014 and 2018.