Software Engineer (Java)

Joybuy; Greater London; On-site; GBP 90,000 - 130,000; Full time

Job summary

JD is seeking a senior backend engineering lead to drive technical decision-making and architecture for JD’s international core systems. You will design and oversee complex architectures, push productization, and balance performance, availability, concurrency, and security through hands-on coding and rigorous reviews.

You will develop backend services in Java and Spring Boot, promote engineering best practices, mentor engineers, and coordinate across global infrastructure to ensure scalable,

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.
• 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.

Responsibilities

• Lead technical decision-making and architecture for JD’s international core systems.
• Design and oversee complex system architectures and drive productization with hands-on coding.
• Architect and develop backend services using Java and Spring Boot, establishing best practices.
• Build and maintain backend systems across global infrastructure.
• Identify and mitigate technical risks, including monitorability and rollback strategies.
• Research and promote new technologies to strengthen architectural capability.
• Provide technical leadership, mentor engineers, and improve team collaboration.
• Work onsite in London, UK.

Skills

Java

Backend development

Multithreading

Performance tuning

System architecture

Leadership

Education

Bachelor's degree in Engineering, Computer Science, Mathematics

Tools

MySQL

Redis

Kafka

Job description

• 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.
• 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.