PayPay
Backend Engineer
Job Summary
This role involves developing and supporting high-scale, complex backend payment systems using technologies such as Java, Kotlin, Scala, and various cloud services like AWS and GCP. The candidate will design scalable architecture, work with distributed databases and caches, and contribute to open source. Strong knowledge of data structures, algorithms, distributed computing, and system design is essential. The position offers a hybrid working model in Japan, with benefits including health insurance, retirement plans, paid leave, and visa support.
Required Skills
Benefits
Job Description
About PayPay
PayPay is a FinTech company that has grown to over 69M (as of May 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.
Job Description
PayPay is looking for a Backend engineer to work on our payment system to deliver the best payment experience for our customers.
Main Responsibilities
- Design large scale systems with high complexity to support our high throughput applications.
- Understand how to leverage infrastructure for solving such large scale problems.
- Develop tools and contribute to open source wherever possible.
- Adopt problem solving as a way of life – always go to the root cause! Support the code you write in production.
Tech Stack
We select the best combination of tech at times.
| Java, Kotlin, Scala
| Spring Boot, JUnit, Reselience4j, Feign
| MySQL/AuoraDB, DynamoDB, ELK, Kafka, Redis, TiDB
| Docker, Kubernetes, ArgoCD, AWS, GCP
| GitHub, IntelliJ, Gradle, Maven, npm/yarn, Flyway, Jenkins, snyk,
| Bigquery, Kibana, Spark
| PlantUML, draw.io, miro.com
| Slack, Zoom
Qualifications
- 3+ years of experience in using Java under professional environment, or if you are non-Java user, excellent skills in generalized programming languages, such as Scala, Python and Go.
- Interest and ability to learn other coding languages as needed.
- Experience with NoSQL databases and distributed cache.
- Strong fundamentals in data structures, algorithms and object oriented programming.
- In-depth understanding of concurrency and distributed computing.
- Degree in Computer Engineering or Computer Science or 3+ years equivalent experience in SaaS platform development.
- Business of English or Japanese
Preferred Qualifications
- Experience with implementing platform components such as RESTful APIs, Pub/Sub Systems, Database Clients.
- Experience with AWS services.
- Experience in working for system development in finance, payment, or similar industries
- Experience in system design, development of web system which handles massive amount of transactions or requires scalability
- Language ability in Japanese and English is a plus (We have a professional translator but it is nice to have language skills)
- Experience in microservices
PayPay 5 senses
- Please refer PayPay 5 senses to learn what we value at work.
Working Conditions
Employment Status
- Full Time
Office Location
- Hybrid Workstyle (flexible working style including Remote and office)
※There are no fixed rules regarding office attendance in Product group; it depends on each individual's discretion.
Work Hours
- Super Flex Time (No Core Time)
- 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
- Special Incentive once a year *Based on company performance and individual contribution and evaluation
- 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)
- 401K
- Translation/Interpretation support
- VISA sponsor + Relocation support
PayPay
PayPay is an app that lets you make easy and convenient payments with just your smartphone. Registration is complete in as little as one minute! You can use it at stores, for online services, and to pay bills.
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