Prompt engineering requires real user data to effectively address edge cases and align inputs with desired outputs, as the rapidly evolving landscape of large language models (LLMs) makes offline testing insufficient. Continuous monitoring of production data helps detect model and user drift, which can subtly alter prompt performance over time. The complexity of LLM architectures means that prompt engineering should be approached as a black-box process, relying on trial and error rather than over-strategizing. To ensure reliability, development and production environments need to be identical, with rigorous versioning and snapshotting of prompt-related artifacts. Effective prompt management involves live monitoring, A/B testing, and regression testing to maintain output quality and swiftly address any issues. Platforms like PromptLayer facilitate this by providing tools for logging, evaluation, and scaling AI applications in production environments, emphasizing the importance of a production-first approach for robust prompt engineering.