Sebastián has been an associate at Arrubla Devis since 2024, after having been an intern at the Firm in 2023. Previously, he served as Manager for Judicial Coordination at G&M CORP. He is a lawyer with an emphasis on commercial law from the University of Medellín and a conciliator in Law, with experience in civil, commercial and contentious-administrative litigation. Currently, he is pursuing a Master's degree in Law with an emphasis on commercial law at the Universidad Pontificia Bolivariana.

He was a professor at the University of Medellín in commercial law, corporate law and legal research. He represented the University of Medellín in national competitions, obtaining first place in the 5th National Commercial Arbitration Competition of the Chamber of Commerce of Medellín and being a semi-finalist in the corporate law competitions (Universidad de los Andes) and the competition (Asociación Cavelier).