DevOps Engineer - Contractor

Responsibilities: 1. Design and develop backend architecture for business systems, ensuring high availability, high performance, and scalability. 2. Perform service governance and performance tuning in high-concurrency scenarios to continuously improve system stability, throughput, and response efficiency. 3. Develop core services and business modules, including user systems, authentication, authorization, and open API capabilities. 4. Participate in microservices architecture design and implementation, promoting system modularization, service-orientation, and engineering excellence. 5. Troubleshoot production issues, analyze performance, and resolve complex technical problems. 6. Collaborate with product, frontend, QA, and cross-functional teams to ensure high-quality delivery of requirements. 7. Continuously optimize development processes, code quality, and technical solutions to improve maintainability and R&D efficiency.   Qualifications: 1. Bachelor's degree or above in Computer Science or a related field. 2. 3-5+ years of Java backend development experience with a solid technical foundation. Outstanding fresh graduates may also be considered. 3. Proficiency in Java core technologies, with a deep understanding of JVM, concurrency programming, collection frameworks, I/O, and network communication. 4. Familiarity with mainstream frameworks like Spring Boot and Spring Cloud, with experience in microservices development and governance. 5. Experience in developing high-perfor