The Internet of Things (IoT) is changing the way mechanical engineers work by introducing smart devices, real-time data, and automation into industrial systems. Therefore, engineers need to acquire new skills to remain relevant in this modern environment. This article identifies seven key competencies that mechanical engineers must develop, including IoT system architecture, integration and sensor calibration, communications protocols, embedded systems, data analysis for predictive maintenance, cybersecurity, and industry automation. Each area is discussed in terms of how it supports real-world applications such as improving machine performance, predicting damage, and enabling automatic control. This study also emphasized the importance of combining technical knowledge with analytical thinking to solve emerging industrial challenges. By strengthening these interdisciplinary skills, engineers can better adapt to connected environments and optimize system-level outcomes. To support industry educators, institutions, and leaders, a competency-based framework is proposed to guide professional training, curriculum design, and workforce development to ensure alignment with the demands of Industry 4.0.
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