Backend Engineer Core Banking and Product Features
PayPay CorporationVisit PayPay Corporation website
Japanese fintech company operating the PayPay mobile payments service.
Maintainer signals as of 9/2/2026
Tokyo, Japan
About PayPay Corporation
PayPay Corporation develops and provides electronic payment services, including the PayPay mobile payment platform. It was founded on June 15, 2018, is headquartered in Tokyo, Japan, and currently operates an active financial-services platform integrating payments with card, banking, securities, and insurance offerings.
Skills
About the Role
Develop and operate Java and Kotlin backend applications for a core banking system renewal project, including architecture, infrastructure, performance, monitoring, and reliability work. The role includes secondment to PayPay Bank and follows a hybrid workstyle.
Requirements
- 3–5 years of backend development experience
- Practical Java experience and strong skills in other common programming languages
- Understanding of data structures, algorithms, and object-oriented programming fundamentals
- Database schema design and efficient query creation for relational and NoSQL databases
- Web application development and tuning experience, including security considerations
- Business-level conversational English
- Hands-on professional software development experience using AI or LLM tools
Responsibilities
- Develop and operate Java and Kotlin backend applications for core banking systems
- Design and develop applications for performance, stability, and high reliability
- Implement infrastructure usage to resolve system challenges
- Design architecture based on application requirements and select middleware
- Tune microservice performance, configure monitoring, and respond to alerts
Benefits
- Social insurance
- 401K
- Translation and interpretation support
- Visa sponsorship
- Relocation support
- Super flex time with no core time
- Annual leave
- Personal leave