Remote

Backend Engineer

Remote OK - Anywhere in Japan
Full-time
July 18, 2025

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

APPLY NOW ➜

About PayPay

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.

PayPay dares to believe that they do not need a clear vision to create a future beyond our imagination. PayPay will always stay true to their roots and realize a vision (future) that no one else can imagine by constantly taking risks and challenging themselves. 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. PayPay is looking for people who can embrace this challenge, refresh the product at breakneck speed and promote PayPay with professionalism and passion.

Japanese Language Policy
At PayPay, there is a mixture of Japanese and English spoken. Around 80% of their product team’s discussions happen in English, and they have technical interpreters and translators on staff to facilitate any translation necessary. Some members can speak both English and Japanese, but some can only speak either English or Japanese.

PayPay doesn’t have an official shared language, but in practice English tends to be the primary language used for internal communications and technical discussions like code reviews.

Instead of requiring that everyone be able to speak a specific language, PayPay expects an ability to communicate with mutual respect and a drive to ensure that you’re understood. The product team values proactive communication highly.
Visa Sponsorship
PayPay sponsors visas for applicants from overseas.
Paid Leave
- Days Off: Saturdays and Sundays. National holidays. Year-end and New Year holidays.
- Holidays: Annual paid leave, congratulatory or condolence leave, maternity leave and etc.
Benefits
🌎 Translation/interpretation support (EN<>JP)

🧡 Support for translation or other administrative tasks in Japanese

👍 Support from bilingual PIC for engineers

🇯🇵 Free Japanese lessons on company time

💻 PC and phone are given (based on the company’s regulations)

👩‍🎓 Training Program: We have various training programs for different kinds of needs

💜 Social security/insurance benefits included

💛 Defined contribution pension system (TBC)

🏥 Health insurance

🚃 Transportation coverage (up to ¥150,000/mo)
Engineer Interview Process
PayPay's Hiring process are as below:
- Application Review (English CV is required)
- Coding Test or Take Home Assignment (only applied to required positions)
- 3-4 Interviews (including both technical and behavioral interviews)
- Offer Meeting
Remote Work
Hybrid Workstyle (flexible working style including Remote and office)

※ You will be expected to work both in the office and remotely, in alignment with organizational guidelines and team objectives.
Work style
- Super Flex Time with no core time
- In principle, from 9:00am-5:45pm (actual working hours: 7h45m + 1h break)