Kostis Saitas - Zarkias is a Machine Learning (ML) Εngineer focused on Responsible AI applications. He has experience in the industry building scalable ML platforms (Peltarion & Preamble) and guardrails for Large Language Models (Preamble), as well as in academic research (Reinforcement Learning and Meta-Learning) along with some publications and a collaboration with the Research Institute of Sweden. His studies consisted of a M.Sc in Machine Learning from KTH Royal Institute of Technology, Sweden and a B.Sc in Computer Science (Information Systems specialization) from Aristotle University of Thessaloniki, Greece. Kostis has also been active in many non-profit assiosiations (e.g serving as a board member of Stockholm AI in 2021-2023) and is actively involved in organizing and leading seminars, mentorship programs and discussion groups around AI ethics, privacy and open-source software.