Backend Engineer

PayPay is seeking a Backend Engineer to work on their payment system and deliver the best payment experience for their customers. The ideal candidate will have experience in using Java under a professional environment or excellent skills in generalized programming languages, such as Scala, Python, and Go. They should also have experience with NoSQL databases and distributed cache, strong fundamentals in data structures, algorithms, and object-oriented programming, and an in-depth understanding of concurrency and distributed computing. The job overview does not have a specific label but is located directly under the company introduction and before the main responsibilities section.

• Design large scale systems with high complexity to support 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.

• 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.
• Business of English or Japanese.
• 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.