English Only Payment Platforms-Java Full-Stack (Japan-based)

Join a high-impact team building secure, scalable payment APIs that power a global digital ecosystem. You will contribute across the full stack using Java and JavaScript, helping shape robust microservices architecture in a high-QPS environment.

Client Details

A leading global internet services group with a large-scale ecosystem spanning e-commerce, fintech, and digital platforms. The organization operates advanced cloud and payment infrastructure supporting millions of users worldwide.

Description

• Design, develop, test, and deploy Java-based payment systems and APIs
• Contribute to scalable, secure microservices architecture
• Build and support full-stack features using JavaScript, HTML, and CSS
• Collaborate with product managers and stakeholders to deliver business-aligned solutions
• Optimize performance and resolve system bottlenecks in high-traffic environments
• Integrate third-party APIs with focus on security and reliability
• Participate in code reviews and maintain high engineering standards
• Contribute to technical documentation and best practices
• Support continuous improvement and adoption of modern development tools and methods

Job Offer

• Opportunity to work on globally impactful payment infrastructure
• Collaborative, international, English-speaking engineering environment
• Exposure to modern architecture (microservices, cloud, high-QPS systems)
• Strong career development and learning opportunities

To apply online please click the 'Apply' button below. For a confidential discussion about this role please contact Kayo Tojo +81366276145.

• Proven experience as a Software Engineer (full-stack preferred)
• Strong Java expertise with Spring Boot / Spring Framework
• Solid front-end skills (JavaScript, HTML, CSS)
• Experience with SQL and backend system design
• Hands-on experience building microservices and RESTful APIs
• Understanding of secure coding practices and system performance optimization
• Familiar with Git and Agile development methodologies
• Strong communication skills in English (business level or above)
• Must currently reside in Japan OR hold a valid Japanese work visa

Nice to Have

• Experience with cloud platforms (e.g., AWS)
• Knowledge of Docker / Kubernetes
• Exposure to AI coding tools or prompt engineering
• Experience with monitoring, tracing, and testing frameworks
• Background in e-commerce or payment systems