Senior Backend Engineer

Job Description: We are looking for senior backend engineers to build, or rebuild, rock solid services with a laser focus on scalability and maintainability. PayPay 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 PayPay ecosystem as PayPay Card is part of the PayPay 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.

Main Responsibilities: 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 Tech Stack 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 CloudWatch is used for observability Coding environment: GitHub, IntelliJ, Gradle Documentation & Project management: Confluence, Miro, JIRA Communication: Slack, Zoom, Office 365 Please note that PayPay Card is challenging its current architecture, potentially introducing new technologies and/or deprecating existing ones.

Required Qualifications: Excellent skills in Java and Spring Boot Experience with RDBMS and NoSQL 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 proficiency Preferred Qualifications Java EE understanding Domain-driven development knowledge Experience in a multicultural environment Stakeholder management is welcomed Japanese conversational proficiency is a plus Working Conditions Employment Status Full Time Office Location Tokyo Office You can live anywhere in Japan Work Hours Full 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 16 days in the first year, granted proportionally according to the month of employment. Can be used from the date of hire) Salary Annual salary paid in 12 installments (monthly) Reviewed once a year Special Incentive once a year *Based on company performance and individual contribution and evaluation Overtime allowance, Late overtime allowance, Commuting and transportation expenses, Work style support allowance Benefits Social Insurance (health insurance, employee pension, employment insurance and compensation insurance) 401K