Note: This role is a fixed-term, 7‑month contract from April 1 to October 31. Candidates must be currently residing in Japan to be eligible for this position.

Your new company

A global leader in tax‑free shopping, payments, and post‑purchase solutions that enhance the shopping journey for retailers and international travellers.

Your new role

• Lead API integration testing activities, including designing and executing test plans, test cases, and regression tests for RESTful services.
• Conduct REST API validation using Postman, including functional, integration, performance, and negative testing.
• Perform troubleshooting and log analysis in Splunk to identify root causes of integration issues.
• Collaborate with external partners and internal development teams to resolve API-related problems and support the integration lifecycle.
• Document defects, API behavior findings, and resolution steps clearly and systematically in issue-tracking systems.
• Ensure API authentication flows comply with OAuth2 (Client Credentials) and assist partners in implementing authentication correctly.
• Participate in Agile ceremonies (daily stand-ups, sprint planning, backlog refinement) and contribute to continuous improvement.
• Maintain clear testing documentation, including integration guides, test reports, and quality checklists.

What you'll need to succeed

• Deep understanding of REST APIs, HTTP methods, and JSON structures.
• Hands-on experience with Postman, including scripting and advanced testing features.
• Proficiency in Splunk log search, dashboards, and troubleshooting workflows.
• Working knowledge of OAuth2 Client Credential Flow.
• Ability to design test plans, test cases, and defect reports.
• Familiarity with API specifications (OpenAPI/Swagger).
• Good knowledge of SQL
• Experience with Agile methodologies (Scrum or Kanban).
• Fluent communication in Japanese and English (written and spoken).
• Optional but beneficial: API automation experience (REST Assured, Cypress, Postman scripts), CI/CD familiarity.

• 3–5 years of experience in software QA, API testing, or similar technical quality assurance roles.
• Bachelor’s degree in Computer Science, Information Technology, Software Engineering, or a related field (or equivalent practical experience).
• Proven proficiency in API testing tools, troubleshooting workflows, and integration collaboration.
• Experience with authentication frameworks and modern API integration patterns.
• Demonstrated ability to work independently and drive issues to resolution.
• Optional but advantageous: ISTQB certification, experience with automated API testing frameworks, exposure to enterprise‑level integrations.
• Business-level bilingual communication skills in Japanese and English

What you need to do now

If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.

If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion on your career.