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Senior Backend Developer - E-commerce Platform

tg japan inc.. • Japan
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Seeking an experienced Senior Backend Developer to lead system architecture and technical decision-making for a large-scale e-commerce platform. Key responsibilities include system design, development, optimization, and ensuring performance, stability, and reliability. Requires 7+ years of Java/Spring/React experience, cloud/container expertise, and strong architecture leadership.

Key Highlights
Lead system architecture and technical decision-making for a large-scale e-commerce platform.
Drive system performance, stability, and reliability through design, optimization, and incident analysis.
Collaborate with product managers and global engineering teams to build robust backend solutions.
Key Responsibilities
Lead requirements definition, system design, development, testing, and deployment.
Collaborate with product managers, engineers, and cross-functional teams to deliver high-quality solutions.
Monitor system stability and performance, identify bottlenecks, and implement improvements.
Design, maintain, and optimize system architecture to ensure scalability, reliability, and maintainability.
Lead technical discussions, architecture reviews, and engineering decision-making.
Investigate production incidents, conduct root cause analysis, and implement preventive measures.
Work closely with related teams to improve system performance and overall service quality.
Technical Skills Required
Java Spring Framework Kubernetes
Benefits & Perks
Salary: ¥9M – ¥12M JPY per year
Flexible working hours with core collaboration hours
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Nice to Have
Experience in the design, development, and operation of high-traffic or mission-critical services.
Development and operations experience in the commerce domain, such as EC, marketplaces, payments, orders, inventory, or search.
Experience in system design and operations using microservices, event-driven architecture, Kafka, etc.
Experience in the design, performance analysis, and tuning of PostgreSQL, MySQL, Oracle, etc.
Experience in system improvement utilizing Monitoring, Tracing, and Logging.
Experience in improving development efficiency or developing services by utilizing generative AI or AI development support tools.
Ability to conduct technical discussions, organize requirements, coordinate with stakeholders, or create documentation in Japanese.

Job Description

Our client is a leading global e-commerce company in Japan operating a large-scale online marketplace. The company is committed to delivering reliable, scalable, and high-performance digital services while continuously enhancing the shopping experience for customers and business partners.

We are seeking an experienced Senior Backend Developer to join a growing engineering team responsible for developing, optimizing, and scaling a large-scale e-commerce platform.

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