The job responsibilities of the Backend Developer include developing intelligent marketing products for a cross-border e-commerce platform, implementing software system codes, and defining system functions and program designs. The qualifications for this role include a bachelor's or master's degree in computer science, software engineering, or a related field, experience as a Java engineer, and a strong understanding of Java programming and object-oriented design principles. Familiarity with Spring framework and rich SQL experience is also required. Additionally, the ideal candidate should have excellent problem-solving and analytical skills, and be able to communicate in English. The company offers a range of benefits, including 8 days of annual leave, 6 days of sick leave, and 15 days of paternity and maternity leave. The company also provides a comprehensive insurance plan, with a 10% contribution to the employee's welfare fund.