Software Development Engineer in Test (SDET) | Fast-Growing AI & FinTech Solutions Company
Company: GAIDOOR株式会社
Role summary
Software Development Engineer in Test (SDET) | Fast-Growing AI & FinTech Solutions Company is a full-time role at GAIDOOR株式会社 in Chuo, Japan (hybrid). Posted 2026-10-10. Salary: JPY 7,000,000–16,000,000 per year. Experience level: 2-5.
- Job title
- Software Development Engineer in Test (SDET) | Fast-Growing AI & FinTech Solutions Company
- Company
- GAIDOOR株式会社
- Location
- Chuo, Japan
- Work arrangement
- hybrid
- Employment type
- full-time
- Category
- QA & Testing
- Salary
- JPY 7,000,000–16,000,000 per year
- Experience level
- 2-5
- Date posted
- 2026-10-10
This is a fantastic opportunity to join a rapidly expanding AI and FinTech company that's at the forefront of digital transformation for major Japanese enterprises. You'll work on cutting-edge AI implementation and data analytics projects, with a competitive salary and the chance to grow your career in a dynamic industry.
Job description
Our client is a fast-growing AI & Data technology company based in Tokyo , providing advanced AI and data solutions to some of Japan’s largest enterprises.
The company has particularly strong expertise in the financial industry , working with major banks and financial institutions on AI implementation, data analytics, data platforms, AI governance, and digital transformation initiatives.
In addition to supporting enterprise clients, the company develops its own AI-powered B2B SaaS products , leveraging its expertise in AI, Data Science, and Software Engineering to solve complex real-world business challenges.
Founded in 2022, the company has grown rapidly to more than 300 employees and is currently preparing for a future IPO. The company is also expanding its operations across Japan and preparing for further international expansion.
Its engineering organization includes professionals with backgrounds in AI, Machine Learning, Data Science, Software Engineering, and large-scale enterprise application development , providing an environment where engineers can work with advanced technologies while directly contributing to products used by major enterprise customers.
About the Product
The company is developing an AI-powered B2B SaaS platform designed to support the modernization of legacy systems for major financial institutions and enterprise customers.
As adoption of the product continues to expand, the company is strengthening its QA organization to ensure stable and consistent product quality.
You will be responsible not only for day-to-day QA activities, but also for test automation and continuous improvement of the overall QA process .
Requirements
Required Qualifications
Professional experience in QA or software testing for web applications
Experience in test planning, test design, and test execution
Hands-on experience implementing automated E2E and/or API testing
Ability to collaborate effectively with Software Engineers, Product Managers, and other stakeholders to improve product quality
Business-level Japanese or above
English communication skills sufficient to work with the development team
Preferred Qualifications
Experience with E2E test automation using Playwright, Cypress, Selenium , or similar tools
Experience integrating automated testing into CI/CD pipelines
QA experience with B2B SaaS or enterprise software products
Experience building or improving test environments and test data
Experience testing products utilizing AI or Large Language Models (LLMs)
Why Join?
AI × FinTech Product
Work on an AI-powered SaaS product addressing complex challenges faced by major financial institutions and enterprise customers.
Test Automation & Quality Engineering
This is not simply a manual QA position. You will have the opportunity to implement E2E/API test automation and improve the company’s overall quality engineering processes.
Rapidly Growing Company
Join a fast-growing technology company with more than 300 employees that is currently preparing for its next stage of expansion and a future IPO.
Work Closely with the Product Team
Collaborate directly with Product Managers, Software Engineers, Designers, Customer Success, and other teams while having a direct impact on product quality.
Flexible Working Environment
The company offers a hybrid working environment and a full flextime system with no core hours .
Benefits
Benefits
Salary: ¥7,000,000 – ¥16,000,000 / year
Location: Nihonbashi / Kayabacho, Tokyo
Work Style
Full-time permanent position.
Hybrid work available.
Full-flex working hours with no core time.
Flexible working hours between 5:00 and 22:00.
Professional discretionary labor system may apply depending on the position.
Standard working time: 8 hours per day with a 1-hour break.
Average overtime: approximately 20–30 hours per month.
123 annual holidays.
Full two-day weekend system.
Year-end/New Year, refresh, childcare, and special leave available.
Benefits
Social insurance.
Defined contribution pension plan.
Employee stock ownership program.
Support for books and study sessions.
Udemy learning support.
Sports allowance.
Health checkup and vaccination support.
Transportation allowance.
Babysitter support.
Relocation support for eligible employees.