Platform Quality Engineer

About KOMOJU

KOMOJU is the leading cross-border payment gateway for Japan. We power payments for companies like video game distribution platform Steam and the popular mobile app TikTok. Today we help thousands of merchants by providing them with the payment infrastructure they need through developer-friendly API’s to integrations on popular platforms like Shopify and Wix; we help our merchants grow in all markets they are expanding.

About the position

We are looking for passionate Platform Quality Engineer to join KOMOJU's growing QA team. In this hybrid role, you will contribute to both automated and manual testing efforts to ensure the reliability, functionality, and performance of our payment systems.

As an Platform Quality Engineer, you will help shape and drive QA processes from the ground up. You will be working cross-functionally with engineers, product managers, and business stakeholders to define and measure quality at every level of our stack. This is a great opportunity for someone who thrives in a collaborative environment and is eager to grow their technical and testing skills.

Responsibilities

• Design, develop, and maintain automated test frameworks and tools to improve test coverage and reliability.
• Execute and manage manual, exploratory, and regression testing for new features and releases.
• Analyze system specifications and technical requirements to provide feedback and ensure testability.
• Identify, document, and track bugs through resolution, contributing to improved product quality.
• Support the team by building and maintaining CI/CD test pipelines and integrating automated tests into release workflows.
• Collaborate with developers to ensure proper testing is done throughout the development lifecycle.
• Participate in code reviews and test plan reviews.
• Help establish quality processes and best practices across the engineering team.
• Investigate and recommend tools or practices that help scale QA and improve team productivity.

Requirements

• 2-5 years of experience in software testing, automation, or software development.
• Proficient in at least one programming language (e.g., TypeScript, JavaScript, Python, or Ruby).
• Hands-on experience with automated testing tools such as Playwright, Selenium, Capybara, or RSpec.
• Strong understanding of testing methodologies including unit, integration, and E2E testing.
• Experience writing and executing test plans and test cases, both automated and manual.
• Familiarity with CI/CD pipelines and test automation integration.
• Ability to work independently in ambiguous environments with a strong bias toward action.
• Excellent communication and debugging skills.

Nice to Haves

These aren't required, but be sure to mention them in your application if you have them.

• Experience testing multilingual or mobile applications.
• Familiarity with AWS, Datadog or performance testing.
• Exposure to backend systems, APIs or infrastructure.
• Experience working in Agile or fast-paced startup environments.
• Open-source contributions.
• Experience working with agile teams or in fast-paced startup environments.
• Open-source contributions.

Benefits

• At Komoju, we embrace remote work while also offering office space for those who prefer in-person collaboration
• 10 days regular vacation, additional 5 days summer, and 5 days winter vacation
• Paid birthday holiday
• Budget for self-learning allowance, to ensure our employees’ skills remain current
• Language training for Japanese/ English
• Twice a week office lunch