Senior Backend Engineer

Pay Pay Card Corporation was established in 2021 to provide users a Fin Tech service that is more accessible and convenient compared to previous credit cards and credit services, by integrating with the Pay Pay payment platform, which has surpassed 66 million users since its launch (as of October 2024).

We are looking for people who are passionate about refining our products at an overwhelming speed that other companies cannot match, as well as professionals who are interested in promoting the spread of cashless payments in Japan and the use of these payments as a financial life platform. Let us work together to create new value for users.

※ Please note that you cannot apply or be selected in parallel with Pay Pay Corporation, Pay Pay Card Corporation and Pay Pay Securities Corporation.

We are looking for senior backend engineers to build, or rebuild, rock solid services with a laser focus on scalability and maintainability.

Pay Pay Card aims at revolutionizing the credit card industry, making payment easier than ever, from two different angles:

• Bring the credit card experience to the next level: we have many functionalities in the pipe to improve our product, not to mention the integration into the Pay Pay ecosystem as Pay Pay Card is part of the Pay Pay Group.

• (Re-)architect our systems landscape: we want to reassess and fix the behind-the-scenes to power a top-notch user experience. It is bundled with difficult design challenges to solve: we simply want to get it right.

As a fast-paced company leading the payments industry, we need our engineers to be versatile and enthusiastic to take on new challenges in order to stay at the forefront. Indeed, we strive for continuous improvement within our systems as well as outside our systems. Additionally, we value communication, to smoothly cooperate with other teams, and inclusivity, to efficiently navigate in a multicultural environment.

• Design, support the implementation and deliver large scale, and complex, systems

• Manage teams stakeholders such as product managers or frontend engineers but also other team leads or non-tech stakeholders.

• Leverage the infrastructure to solve such large scale problems

• Acts as a gatekeeper to the team quality standard

• Triage, debug and resolve product issues or other incoming inquiries

• Mentor other team members and saveguard the team quality standards

We currently work with

• Back-end services:

  • Main implementations are in Spring Boot, with a mix of Java 11/Spring Boot 2 and Java 17/Spring Boot 3.

  • Some legacy systems are written in Java EE.

  • Testing is done with JUnit and Mockito

  • Deployment relies on AWS ECS

  • CI/CD is handled by AWS Code Pipeline

• Infrastructure

  • All our services run in AWS

  • Infrastructure is managed by AWS Cloud Formation

  • AWS Cloud Watch is used for observability

• Coding environment:
  Git Hub, IntelliJ, Gradle

• Documentation & Project management:
  Confluence, Miro, JIRA

• Communication:
  Slack, Zoom, Office 365

Please note that Pay Pay Card is challenging its current architecture, potentially introducing new technologies and/or deprecating existing ones.

• Excellent skills in Java and Spring Boot

• Experience with RDBMS and No
  
  SQL databases, along with distributed cache.

• Strong fundamentals in data structures, algorithms and object oriented programming.

• In-depth understanding of concurrency and distributed computing.

• Experience implementing platform components such as RESTful APIs, Pub/Sub Systems, and Database Clients.

• Experience with microservices and event-driven architectures

• Experience designing high traffic systems.

• Degree in Computer Engineering or Computer Science or 5+ years equivalent experience in SaaS platform development.

• English business…