Back-end Engineer (Remote) – PayPay


Job Description

PayPay is looking for a Back-end engineer to work on our payment system to deliver the best payment experience for our customers.

• 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 root cause! Support the code you write in production.



【Tech Stack /採用している技術】We select the best combination of tech at times. / その時期ごとに最適なものを選定しています。
| 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,,
| Slack, Zoom


• 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 5+ years equivalent experience in SaaS platform development.
・Javaの業務使用経験をお持ちの方、あるいは、Java以外のScala, Python, Goなどの汎用プログラミング言語の卓越したスキルをお持ちの方


Preferred Qualifications / 歓迎するスキル/経験

• 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
・RESTful API、Pub / Subシステム、Database Clientなどのプラットフォームコンポーネントの実装経験
・英語力 (専門の通訳が社内におりますが、あれば尚可)

About PayPay

PayPay, a fintech company, that achieved more than 36M users within around 2 years since its launch in 2018 has hugely diversified employees who are from 35 different countries. The number of employees by now is more than 1,000 staff members, and yet the company is still incomplete and at a growing stage.