QA Engineer (Test Automation)

Career Opportunity for a QA Engineer in Japan!

 

■ QA Engineer (Test Automation)

 

■ Company Overview

A Japan-originated global Web3 technology company building next-generation blockchain infrastructure, decentralized applications, and on-chain products. With strong partnerships across major global enterprises and financial institutions, it is focused on bringing blockchain technology into mainstream use and building the infrastructure for the next generation of the internet.

 

■ Your Role and Responsibilities 

● Define QA standards, release criteria, and quality metrics.

● Design, build, and maintain scalable E2E automated test frameworks (e.g., Playwright) (80–90% of the role involves building automation).

● Validate trading logic: execution paths, price impact, fee calculations, and thousands of user paths (Strium).

● Modernize, optimize, and expand existing E2E testing infrastructure.

● API testing: verify consistency between backend responses and frontend behavior.

● API load and stress testing designed for high-throughput environments.

● Design reproducible test environments and test data.

● Collaborate with engineering and product teams to define "testable acceptance criteria."

 

■ Experience and Qualifications

● Candidates must have at least 5 years of professional experience and advanced English proficiency, and meet at least three of the following criteria (English is the company's official language):

● At least 5 years of QA experience with web, mobile, financial systems, or Fintech products, including at least 2 years of test automation experience.

● Proven track record of building E2E test frameworks (e.g., Playwright, Cypress, Appium, Selenium) from scratch.

● Ability to write test automation code (this is a coding-intensive QA role; JavaScript/TypeScript is ideal, but Java/Python are also acceptable. Since the existing E2E infrastructure and frontend are built using JS/TS, you will be expected to get up to speed on these after joining).

● Experience testing complex Fintech or financial products, having navigated both technical complexities (e.g., transaction integrity, asynchronous processing) and organizational complexities (e.g., development involving multiple teams and stakeholders).

● Experience designing highly maintainable automated test suites integrated into CI pipelines.

● Ability to work autonomously as the sole QA professional for a product or team.  Ability to proactively clarify requirements across teams, even when specifications are ambiguous

● Experience taking ownership of defining quality standards and test strategies, and driving the team to implement them (organization size is not a factor; the role requires building systems/processes rather than simply executing pre-defined tests)

● English proficiency beyond a conversational level (English is the official company language; native-level fluency is not required)

● Curiosity and a drive to quickly learn and assimilate knowledge in unfamiliar domains (prior blockchain experience is not required)

 

■ Additional Preferred Qualifications

● Experience with E2E automation for exchanges, securities, or financial systems

● Knowledge of blockchain, smart contracts, and on-chain transactions

● Practical experience with load testing tools (e.g., k6, Artillery)

● Experience using AI tools for test generation and test operations

● Understanding of trading concepts (slippage, liquidity, execution flow)

 

■ Good Reasons to Join

● Gain exposure to collaborations with leading technology, financial, and enterprise organizations.

 

■ Work Location

Tokyo, Japan
 

Details will be provided during the meeting.