Leadership is challenging to develop in isolation. While you can practice programming, architecture, or databases independently, leadership relies on skills such as communication, influence, negotiation, feedback, conflict resolution, and decision-making, all of which require interaction with others. As leadership becomes more important for software engineers advancing in their careers, a key question arises: where can engineers practice these skills before becoming managers?Open source offers an ideal environment to develop both technical and leadership skills. Engineers tackle real technical challenges — such as coding, API design, architecture, testing, and documentation—while collaborating with individuals from diverse backgrounds, priorities, and perspectives. Although contributions often start with a pull request, advancing in the community requires explaining ideas, accepting feedback, building consensus, mentoring, and influencing technical direction. Open source is therefore more than a platform for technical growth; it serves as a practical setting for developing technical leadership.