Principal Software Engineer

  • Remote OK - Anywhere in Japan
  • Full-time
  • June 25, 2024
Apply from Japan Only
(You must live in Japan to apply)
Language Requirements
Japanese: Not Required 👍
English: Business Level
Minimum Experience
Senior or above

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.



  • 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!



  • 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,,
  • Communication: Slack, Zoom



  • 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)



  • 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, a fintech company that achieved more than 47M users within around 3 years since its launch in 2018 has hugely diversified employees who are from 40 different countries.

Our biggest competitor is "cash". We are seeking for people who can accept this challenge positively, brush up the product at a tremendous speed that other companies could never achieve, and who are passionate about promoting and spreading such a financial life platform in a short time along with professionalism.

PayPay’s policies during COVID-19 are as follows:

  • PayPay has been transitioning to remote work to ensure employees safety during the pandemic, and we’ll continue this even after it subsides.

  • While we’re open to considering engineers looking to relocate to Japan, travel restrictions have made it difficult to give a clear timeframe for relocation.

  • Until COVID-19 is settled and we're ready to issue visas, you can start working remotely from abroad.

View PayPay's company page

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Principal Software Engineer at PayPay
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