Full Stack QA Engineer | Tokyo | Hybrid | FinTech

Full Stack QA Engineer | Tokyo | Hybrid | FinTech

Salary: 6,000,000 JPY~12,000,000 JPY depending on experience

Hybrid work: Twice a week in office minimum

We’re hiring a Full Stack QA Engineer to join a rapidly growing international FinTech company and help shape the next generation of financial services in Japan.

This is a great opportunity for a QA professional who enjoys test automation, modern technologies, and AI-driven quality engineering , and who wants to have a real impact in a large-scale product environment.

What You’ll Do

• Design comprehensive test strategies, scenarios, and test cases across mobile, web, and API applications.
• Drive test automation while also taking ownership of manual and exploratory testing.
• Build and maintain automated test frameworks and CI/CD pipelines.
• Analyze requirements and ensure strong functional and non-functional test coverage.
• Identify, track, and resolve defects while continuously improving QA processes.
• Act as a QA subject-matter expert and support junior engineers.
• Collaborate closely with developers, product teams, and other stakeholders.
• Leverage AI tools and LLM technologies to improve test design, automation, and exploratory testing.
• Validate AI-powered applications, including testing for hallucinations, bias, drift, robustness, and performance.
• Explore technologies such as OpenAI APIs, RAG, embeddings, and MCP integrations.

Tech Stack

Automation: Appium, Playwright, Selenium, Rest-Assured, Cucumber

CI/CD: GitHub Actions, Bitrise, Jenkins or similar

Architecture: Microservices, APIs

AI: OpenAI API, LLMs, RAG, embeddings, MCP

Cloud/Infrastructure: Docker, Kubernetes

Performance: Gatling, JMeter, wrk

What We’re Looking For

• 3+ years of professional experience in QA automation.
• Experience testing mobile apps, web applications, and/or APIs.
• Hands-on experience with at least one automation framework such as Appium, Playwright/Selenium, or Rest-Assured.
• Experience with Cucumber and CI/CD environments.
• Strong understanding of test strategy, test case design, and QA methodologies.
• Good knowledge of microservices and their testing challenges.
• Strong analytical and problem-solving skills.
• Excellent communication and collaboration skills.
• Professional experience using AI productivity tools such as Cursor, GitHub Copilot, Gemini, or similar.
• Knowledge of OpenAI APIs and LLM integration.
• Business-level English, Japanese is not required.

Nice to Have

• ISTQB or equivalent QA certification.
• FinTech, banking, or payments experience.
• Agile development experience.
• Performance testing experience.
• Docker/Kubernetes experience.
• Coding experience in web or mobile development.
• Experience integrating AI into software development or QA workflows.

Why Join?

• Work on products used at massive scale.
• Join a highly international engineering environment.
• Help build and improve next-generation financial technology.
• Work with cutting-edge AI and automation technologies.
• Opportunity to influence QA standards and processes.
• Hybrid working environment in Tokyo.
• Visa sponsorship / relocation support available.

📩 Interested? Please apply to this role.