Abstract: The embedded software design of smart meters not only needs to ensure the accuracy and real-time performance of data, but also must meet the requirements of high efficiency, stability, and security. This article explores the five core skills of embedded software engineers for smart meters, aiming to provide technical guidance and practical references for industry practitioners. Firstly, the article outlines the basic concepts of embedded systems for smart meters and their role in modern power systems. Next, we will focus on introducing efficient embedded system design techniques, including hardware selection and software architecture optimization, to improve the overall performance of the system. Subsequently, the application of real-time operating system(RTOS) was analyzed in detail, and how to use RTOS for task scheduling and resource management to ensure the real-time performance and responsiveness of the system was discussed. The third part focuses on optimizing communication protocols and data management, covering key technologies for smart meter data transmission and security. The fourth part discusses the best practices for fault diagnosis and system maintenance, providing methods to improve system reliability and stability. Finally, the article explores software updates and version control strategies, emphasizing the importance of effective upgrades while maintaining system stability. Through a comprehensive analysis of these five core skills, this article aims to provide practical technical solutions for embedded software engineers of smart meters, and promote the development and application of smart meter technology.