Effective developer onboarding is crucial for integrating new team members and ensuring long-term retention, productivity, and satisfaction. A well-structured onboarding process involves comprehensive, accessible documentation that includes context and real examples, and is efficiently organized to prevent new hires from feeling overwhelmed or undervalued. Companies should leverage tools that automate and centralize documentation, making it a living resource that extends beyond onboarding to support ongoing knowledge preservation, reduce context switching, and enhance code quality and maintainability. Additionally, documentation should cover debugging and observability practices, allowing new engineers to independently navigate and solve issues. Continual feedback and iteration on documentation practices ensure they remain relevant and useful, fostering a collaborative and thriving engineering culture. By prioritizing documentation, companies can accelerate onboarding, improve incident response, and maintain high employee retention, ultimately building a strong foundation of knowledge and collaboration.