PayPay is hiring a Backend Engineer to design and develop our core banking system from scratch. You must have 3-5 years of experience in Java/Kotlin and strong database design skills. We are looking for someone to ensure high reliability for our financial platform. Proficiency with *
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PayPay is a FinTech company that has grown to over 70M (as of July 2025) users since its launch in 2018. Our team is hugely diverse with members from over 50 different countries.
OUR VISION IS UNLIMITED_
We dare to believe that we do not need a clear vision to create a future beyond our imagination. PayPay will always stay true to our roots and realize a vision (future) that no one else can imagine by constantly taking risks and challenging ourselves. With this mindset, you will be presented with new and exciting opportunities on a daily basis and have the opportunity to grow and reach new dimensions that you could never have imagined. We are looking for people who can embrace this challenge, refresh the product at breakneck speed and promote PayPay with professionalism and passion.
※ Please note that you cannot apply or be selected in parallel with PayPay Corporation, PayPay Card Corporation and PayPay Securities Corporation.
The team you will join is leading a full-scratch development project to renew our banking systems. Our in-house engineers take the lead in planning, designing, and even coding the core banking system and business logic from scratch. As it's a new organization, you can collectively help create the development rules and environment.
※ After joining the company, you are expected to be seconded to PayPay Bank as a member of the above project.
With rapid business growth, the number of employees is also expanding rapidly, and strengthening the organizational structure for business growth is an urgent task.
事業成長に伴い、従業員数も急拡大しており、事業成長に向けた組織体制の強化が急務とされています。
Job Responsibilities・具体的な業務内容
Develop and operate backend applications in Java language (Java/Kotlin) for core banking systems
Designing and developing for both performance and stability to maintain high reliability as a financial platform
Understanding and implementing how to utilize infrastructure to solve system challenges
Designing architecture based on application requirements and selecting middleware, etc.
Performance tuning, monitoring settings, and alert response for microservices
We select the best combination of tech at times.
| Spring Boot, JUnit, Resilience4j, Feign
| MySQL/AuoraDB, DynamoDB, ELK, Kafka, Redis
| Docker, Kubernetes, ArgoCD, AWS
| GitHub, Gradle, Maven, npm/yarn, Flyway
| PlantUML, draw.io, miro.com
| Slack, Zoom, Confluence, Jira
Attractiveness of This Position・本ポジションの魅力
Gain experience from the design to the introduction of a new system renewal
Opportunity to collaboratively build a new organization and environment
Acquire high-level planning and proposal capabilities through supporting top management's decision-making and high-level coordination with various departments and affiliated companies, including PayPay
Gain frontline work experience in the industry at a company aiming to provide unprecedented financial services during a transformative period in the financial industry
Ability to leverage PayPay's service and user base
What is differences with PayPay (Please choose the position that best aligns with your career goals, as we do not allow simultaneous applications for two positions）
Working Conditions
Employment Status
Full Time
Office Location
HHybrid Workstyle
※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives.
In principle, 9:00am-5:45pm + 1h break (actual working hours: 7h45m + 1h break)
Holidays
Every Sat/Sun/National holidays (In Japan)/New Year's break/Company-designated Special days
Paid leave
Annual leave (up to 14 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire)
Personal leave (5 days each year, granted proportionally according to the month of employment）
＊PayPay's own special paid leave system, which can be used to attend to illnesses, injuries, hospital visits, etc., of the employee, family members, pets, etc.
Salary
Annual salary paid in 12 installments (monthly)
Based on skills, experience, and abilities
Reviewed once a year
Late overtime allowance
※Payroll payment can be changed to digital salary payment “PayPay Paycheck” for an amount set by you
Benefits
Social Insurance (health insurance, employee pension, employment insurance and compensation insurance)
