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PayPay

Mobile payments platform with QR/merchant services

Full Stack QA Engineer

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

About the Job

Requirements

  • At least 3 years of professional experience developing, executing, and maintaining automated test cases for mobile applications, web applications, and/or APIs.
  • Professional experience with at least one automation framework or tool: Appium for mobile, Playwright or Selenium for web, or Rest-Assured for APIs.
  • Proficiency in using Cucumber to define and execute test cases.
  • Knowledge of continuous integration and continuous deployment tools such as GitHub Actions or Bitrise, or similar platforms.
  • Basic understanding of microservices architecture and its testing challenges.
  • Ability to analyze technical requirements, design comprehensive test strategies, and create detailed, effective test cases.
  • Experience using AI productivity tools such as NotebookLM, Gemini, Cursor AI, and GitHub Copilot.
  • Knowledge of OpenAI API usage, key management, embeddings, and large language model integration workflows.
  • Familiarity with Model Context Protocol server concepts and their integration in test automation pipelines.
  • Understanding of AI system validation techniques, including testing for bias, hallucinations, drift, and robustness.
  • Business-level English proficiency.

Responsibilities

  • Analyze testing requirements and develop comprehensive test scenarios for various test levels.
  • Design and create detailed test cases that validate conformance to functional and non-functional requirements.
  • Prepare and manage test data, tools, and environments required for test execution.
  • Execute test cases and scripts and document the results.
  • Drive quality improvement with a strong focus on test automation while taking ownership of comprehensive validation activities that include manual testing.
  • Log, track, and verify defects, ensuring accurate documentation and timely resolution.
  • Collect, organize, and analyze test results and provide reports on QA activities.
  • Analyze testing outcomes and recommend effective solutions for identified issues.
  • Maintain and update test documentation to cover new features and support robust regression testing.
  • Participate in testing discussions, support knowledge management, and contribute to continuous improvement through lessons learned.
  • Act as a subject matter expert for designated modules, providing domain knowledge and support to the QA team.
  • Provide guidance and support to junior QA engineers, including onboarding and training.
  • Use AI tools such as NotebookLM, Gemini, Cursor AI, GitHub Copilot, and OpenAI APIs to accelerate test case design, automation, and exploratory testing.
  • Apply prompt engineering and retrieval-augmented generation techniques to validate large language model-driven applications for accuracy, reliability, and robustness.
  • Work with OpenAI keys, large language models, and Model Context Protocol server integrations; automate API-based interactions and secure AI workflows.
  • Test and monitor AI and machine-learning systems for bias, drift, hallucinations, and performance deviations.

Desired Qualifications

  • ISTQB or equivalent QA certification.
  • Experience working in Agile or other fast-paced development environments.
  • Familiarity with the financial or payments domain.
  • Experience proposing and standardizing QA processes and collaborating effectively with cross-functional teams.
  • Experience designing and executing performance tests using tools such as Gatling, wrk, or JMeter.
  • Familiarity with Docker and Kubernetes for containerization and orchestration.
  • Experience with Bash or other command-line interface scripting.
  • Coding experience building web- or mobile-based applications.
  • Ability to conduct business in Japanese at native level or equivalent to JLPT N1/N2.
  • A track record of integrating AI-assisted development into system design and delivery.
  • Contributions to AI-related open-source projects or experience automating workflows with AI.

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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