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Job ID : 1577409
Date Updated :
February 9th, 2026
Java Engineer - Online Payment Platform
Java Engineer - Online Payment Platform (Consumer & Merchant)
| Location | Tokyo - 23 Wards |
| Job Type | Temporary |
| Salary | Based on hourly rate |
Job Description
This mid-level Java Engineer role sits in the online payments development team, building high-performance, highly available systems for both consumers and merchants. You will work across multiple services, from checkout flows and merchant APIs to data platforms and onboarding tools, in a highly collaborative engineering environment.Client Details
Our client is a leading Japanese fintech company within a major internet group, providing one of the largest online payment platforms for e-commerce merchants across Japan. Their services support thousands of online stores nationwide, and the online payment business is a core pillar in the group's growth strategy.Description
As a mid-level engineer, you will join an experienced development team responsible for mission-critical online payment systems. Your main responsibilities will include:- Designing, developing and maintaining Java-based web applications for online payments
- Building and improving high-performance, highly available systems for:
- Consumer-facing payment flows
- Merchant-facing API services
- Merchant management and back-office systems
- Large-scale payment data aggregation systems
- New merchant onboarding and application systems
- Writing clean, maintainable code and contributing to code reviews and design discussions
- Working closely with product managers, QA and operations teams to deliver secure, stable, and scalable services
- Proactively identifying issues, proposing solutions, and driving continuous improvement in performance, efficiency and reliability
- Ensuring compliance with global security standards (e.g. PCI DSS) in collaboration with relevant stakeholders
Job Offer
- Opportunity to contribute to a high-impact online payment platform used by thousands of e-commerce merchants across Japan
- Exposure to large-scale, high-availability systems and global security standards such as PCI DSS
- A collaborative engineering culture that values ownership, problem-solving, and continuous improvement
- Clear career development opportunities, including the potential path to permanent employment (conversion not guaranteed)
- Bilingual environment where you can leverage and further strengthen both Japanese and English skills
- Stable yet innovative environment as part of a major internet/fintech group
To apply online please click the 'Apply' button below. For a confidential discussion about this role please contact Serena Wu on +81 3 6627 6137.
General Requirements
| Minimum Experience Level | No experience |
| Career Level | Mid Career |
| Minimum English Level | Daily Conversation |
| Minimum Japanese Level | Business Level |
| Minimum Education Level | Bachelor's Degree |
| Visa Status | Permission to work in Japan required |
Required Skills
The ideal candidate will have the following experience and skills:
Must-have:
- 3+ years of hands-on experience in Java web application development
- Practical experience in application development using SQL (1+ year)
- 2+ years of experience developing consumer-facing web applications
- Basic knowledge and experience with Linux/Unix environments
- Strong communication skills and the ability to build trustful relationships within the team
- Ability to make sound judgments and constructive proposals based on the situation
- Proactive, self-driven mindset with a strong sense of ownership
- Intention and motivation to convert to a permanent employee in the mid to long term (not guaranteed but expected path)
- Language:
- Native or fluent Japanese
- Daily conversational level English (around TOEIC 600 or equivalent is preferred)
Nice-to-have:
- Experience operating Apache and Tomcat
- Experience with frameworks such as Struts and Spring
- Front-end skills using HTML, CSS, and JavaScript for web UI development
- Experience with public cloud services, Kubernetes, and Docker
- Experience using Git, Jenkins, and Maven in a modern development workflow
- Knowledge of, or strong interest in, payment services and financial systems
Job Location
- Tokyo - 23 Wards
Work Conditions
| Job Type | Temporary |
| Salary | Based on hourly rate |
| Hourly Rate | ¥3000 - ¥5000 |
| Industry | Software |
