Essential requirements: Power consumption/lag/TCP weak network, high-frequency anomaly monitoring, UI rendering/smoothness monitoring, network monitoring, weak network optimization, TCP/UDP privatization protocol and other project practical experience. Job responsibilities: * iOS basic framework development, system architecture, technology selection, performance problem solving and optimization * iOS monitoring platform, component development, network link optimization, monitoring and collection development, UI rendering optimization * New technology research, continuous optimization of product iOS technical defects and framework issues, startup optimization