Software Engineer (Java)

Key Responsibilities: Lead technical decision-making and architecture design for JD’s international core systems, ensuring high standards of performance, availability, concurrency, security, and scalability.Design and oversee complex system architectures and drive productization efforts, maintaining architectural quality through hands-on coding, continuous performance evaluation, and system optimization.Architect and develop backend services using Java and Spring Boot, establishing engineering best practices and reusable technical frameworks.Build and maintain backend systems for JD’s operation centres, ensuring seamless integration across global infrastructure.Identify, assess, and mitigate technical risks throughout project implementation, covering monitorability, maintainability, grey release strategies, and rollback capabilities.Research, evaluate, and promote new technologies and methodologies, identifying integration opportunities within global architectures to strengthen the team’s technical capability and architectural foresight.Provide technical leadership, mentor engineers, and continuously optimize team collaboration and engineering best practices.Work onsite in London, UK. Minimum Qualifications: Bachelor’s degree in Engineering, Computer Science, Mathematics, or a related technical field.5+ years of backend development experience with strong Java expertise, including JVM fundamentals, concurrency, multithreading, and performance tuning.Proven experience designing architectures for large-scale e-commerce platforms; international system experience preferred.Strong server-side architecture skills with solid knowledge of middleware such as MySQL, Redis, Kafka, and distributed systems in high-availability, high-concurrency environments.Excellent coding standards with a passion for technology and open-source learning.Strong analytical, problem-solving, and learning abilities with a proactive mindset.Demonstrated team leadership experience and effective communication skills in both Chinese and English. Preferred Qualifications: Work experience in large-scale ecommerce companies.Experience in supply chain, fulfilment, logistics, or marketing systems.Experience in UK and European business.