Varun's response does not address the question asked. The interviewer requested insights into how Varun ensures the scalability and maintainability of the systems he develops. Varun's one-word response does not provide any information on his methodologies, practices, or experiences related to system development. Varun should provide a detailed explanation of the strategies he employs to create scalable and maintainable systems, including specific examples of tools, processes, and design principles he has used in past projects.