Java Backend Engineer Recruitment JD Job Responsibilities: Participate in the design and development of backend systems, optimize existing system architecture; Responsible for the development, debugging, and maintenance of distributed systems to ensure their efficient and stable operation; Addressing high concurrency and performance optimization issues in the system; Work closely with algorithms, big data, front-end, product, testing and other teams to promote high-quality project implementation; Participate in the design review of the company's technical solutions and provide optimization suggestions.