Gregor Ojstersek is a Slovenian software engineering leader (formerly at eToro and now publishing independently) who runs the Engineering Leadership newsletter — one of the more widely read newsletters in the senior-engineer / engineering-management space. His writing focuses on the soft-skills and career-trajectory side of software engineering rather than on individual technologies.
His CourseFlix listing carries Senior Engineer to Lead: Grow and thrive in the role — a paid course aimed at senior individual contributors making the transition into team-lead or engineering-manager positions, focused on the practical patterns of the role rather than abstract management theory.