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PayPay

Mobile payments platform with QR/merchant services

Backend Engineer - Core Banking System

Backend EngineeringConfirmed live in the last 24 hours
Full-timeJapanNo salary listed

About the Job

Requirements

  • At least 3 years of hands-on backend development experience using Java, C, or another major programming language.
  • If lacking professional Java or C experience, the candidate must be willing and able to learn these languages after joining.
  • Understanding of data structures, algorithms, and object-oriented programming fundamentals.
  • Experience designing database schemas (RDB, NoSQL, etc.) and developing efficient queries.
  • Experience in web application development and performance tuning, with an understanding of security considerations.
  • Japanese proficiency at native level or equivalent to JLPT N1 or N2.

Responsibilities

  • Design systems to achieve high reliability as a financial platform.
  • Develop backend systems balancing performance and stability.
  • Design architecture, select middleware, and design integration with infrastructure.
  • Improve microservice performance, monitoring, and alerts, and analyze failures.

Desired Qualifications

  • Professional backend development experience using Java.
  • Development experience using C.
  • Development experience in the financial industry.
  • Experience implementing platform components such as RESTful APIs, Pub/Sub systems, and database clients.
  • Development experience using AWS services.
  • Experience in system design and developing applications or web products handling large-scale transactions or requiring scalability.
  • Experience with microservices.
  • Business-level conversational English proficiency.

About the Company

PayPay

Mobile payments platform with QR/merchant services

PayPay provides a mobile payments platform in Japan that lets users pay by linking a bank account or credit card to the app and paying at stores, online, or for bills by scanning a QR code or showing a barcode. The PayPay app processes purchases by transferring funds from the linked payment method at checkout and also offers a growing set of financial services through its group companies, including cards, banking, loans, deposits, and investments, within a single app. It differentiates itself with a large Japan-wide merchant network and a broad ecosystem that combines payments with credit, banking, and investment services. Its goal is to be the leading cashless payments platform in Japan while expanding globally, including potential entry into the U.S. market through partnerships and IPO plans.

Company size
1,001-5,000
Company stage
IPO
Headquarters
Tokyo, Japan
Founded
2018

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