ByteDance is re-entering the smartphone market with a robust research and development initiative, five years after discontinuing its Nubia smartphone business. The company is building a complete smartphone-grade software and hardware foundation, as revealed by a detailed analysis of its job postings. ByteDance's efforts include reconstructing Android/RTOS systems and advancing to the New Product Introduction (NPI) pilot production phase, closely aligning with contract manufacturers. The Shenzhen R&D hub is aggressively hiring for roles in full-device manufacturing, high-speed PCB interconnects, and hardware baseband engineering. The company is also focusing on flagship-level hardware features such as foldable displays and IP68/IP69K standards. In Beijing, Android system experts will oversee the entire lifecycle of smartphone development, from project initiation to mass production, including Qualcomm platform optimization. ByteDance's strategic move into smartphone R&D is driven by ecosystem challenges in edge AI, aiming to integrate its DouBao Mobile Assistant as a core system component rather than just an app. This initiative highlights ByteDance's ambition to establish a significant presence in the smartphone industry by addressing fundamental system-level integration issues.