Principal Software Engineer

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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.

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 sensesto 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.

• 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
• 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

Other Information:

• PayPay Inside-Out (Corporate Blog) /JP
• PayPay Inside-out (Corporate Blog) /ENG
• PayPay Product Blog /JP
• PayPay Product Blog /ENG