About PayPay

PayPay is a FinTech company that has grown to over 75M (as of August 2026) 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.

Mission

Drive teams to expand and optimize technical vision, architecture, system design, development process of systems
Work with teams to answer consultations; furthermore, identify and prioritize tech debt and determine the best approach for resolving it.
Realize the vision through measurable gains in system scalability and efficiency.
Serve as a role model for junior engineers through mentoring and direct education.

Job Description

We are looking for a Principal Software Engineer to work on our various systems which need high scalability, reliability and availability. These challenges require creative thinking and a deep understanding of how software and platform work.

Our ideal candidate is an ace problem solver and a learner at heart. You should have a very high degree of comfort in a programming language of your choice. We offer a flexible work schedule and you get your choice of tools (both hardware and software) and most importantly, the opportunity to work on tough problems with the brightest minds around you. So, if challenges excite you, and you're ready for a big one, let us know.

Responsibilities:

Design, develop, test, deploy, maintain and improve software and core platform
Lead technical aspects for multiple projects through hands-on execution and guidance of other engineers
Provide architectural blueprints and technical leadership.
Provides input and guidance during all phases of programs to solve challenging technical issues.
Build common platforms to support different business vertical application systems
Develop tools and contribute to open source wherever possible
Adopt problem-solving as a way of life – always go to the root cause!

Experience:

Solid foundation in designing, implementing, and maintaining a large-scale distributed system.
Experience in developing distributed platform systems such as Messaging Platforms, Pub/Sub Systems, Databases, Distributed Computing Frameworks, and Schedulers.

Tech Stack:

Our technology stack may vary based on project needs. Currently, we utilize:

Programming Languages: Java, Kotlin, Scala
Frameworks and Tools: Spring Boot, JUnit, Resilience4j, Feign
Databases: MySQL/AuroraDB, DynamoDB, ELK, Kafka, Redis, TiDB
Deployment and Orchestration: Docker, Kubernetes, ArgoCD, AWS, GCP
Development Tools: GitHub, IntelliJ, Gradle, Maven, npm/yarn, Flyway, Jenkins
Data Analytics: BigQuery, Kibana, Spark
Diagramming Tools: PlantUML, draw.io, miro.com
Communication: Slack, Zoom

Qualifications:

Degree in Computer Engineering or Computer Science or 7+ years equivalent experience in software development
Strong fundamentals in data structure, algorithm, operating system and object-oriented programming
Deep understanding of concurrency, distributed computing, large-scale system, messaging and algorithm
Software development experience in one or more general-purpose programming languages
Interest and ability to learn new technology stacks as needed

Preferred Qualifications:

Experience in working for system development in finance, payment, or similar industries
Experience with AWS services
Contribute to open-source projects
Language ability in Japanese and English is a plus (We have a professional translator but it is nice to have language skills)

Portrait:

Experience: Demonstrated experience designing and implementing large scale, high performance, micro-service based architectures utilizing new concepts and technologies where appropriate.
Ownership: A mentoring approach to owning, managing and improving the technical aspects of a large scale system end to end.
Communication: The ability to clearly and logically communicate your choice of technology and architectural decision based on its implementation strengths and limitations.
Commitment: As a professional, commit to the growth and business goals of the organization and create impactful results by your ownership.
Curiosity: Foster a development culture that explores new ideas knowing that we learn even from the ones that fail.

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

※ You will be expected to work in the office, in alignment with organizational guidelines and team objectives.

LIFE in JAPAN FACTBOOK

Work Hours

Super Flex Time (No Core Time)
In principle, 9:00am-5:45pm (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)
401K
Translation/Interpretation support
VISA sponsor + Relocation support

Other Information:

PayPay Inside-Out (Corporate Blog) /JP
PayPay Inside-out (Corporate Blog) /ENG
PayPay Product Blog /JP
PayPay Product Blog /ENG
PIVOT動画：【PayPayが仕掛ける金融革命】