The rapid advancement of the Internet of Things (IoT) has significantly transformed traditional living environments into intelligent and interconnected smart homes. This paper presents SmartLiving: An IoT-Driven Mobile-Controlled Home Automation Ecosystem, a scalable and energy-efficient system designed to automate and monitor household appliances through a mobile application. The proposed system integrates IoT-enabled sensors, microcontrollers, and wireless communication protocols to provide real-time control, monitoring, and data analysis. Users can remotely manage lighting, temperature, security systems, and electrical appliances via a secure smartphone interface, enhancing convenience, safety, and energy optimization. The architecture employs a cloud-based framework for seamless data transmission and storage, ensuring reliable device communication and remote accessibility. Security mechanisms such as user authentication and encrypted communication are incorporated to protect against unauthorized access. The system is designed with modularity and scalability in mind, allowing the integration of additional smart devices without significant infrastructure changes. Performance evaluation demonstrates improved response time, reduced energy consumption, and enhanced system reliability compared to conventional automation systems. SmartLiving aims to contribute to sustainable and intelligent living by combining IoT technology with user-friendly mobile control. The proposed ecosystem offers a cost-effective solution adaptable to residential environments, promoting energy conservation and improved quality of life.