[High pay/Full Remote/Unlimited PTO] Senior Quality Assurance Engineer — Trading Systems

This is an elite tier Start-up that is being backed by major financial institutions. They are building infrastructure and products at the frontier of decentralized technology. The work is technically demanding, highly user-facing, and increasingly important as the category matures.We can’t say much publicly about the company or product yet.We can say this:You’ll work directly on core product experiences, influence frontend architecture, and own meaningful problems from first principles through production.The environment is fast, highly autonomous, and engineering-led. Small team. High trust. Very little bureaucracy.You’ll own:

• The automation strategy across API and E2E
• Testing of trading flows, execution logic, pricing, fees, and edge cases
• High-throughput and failure-mode testing
• Test environments, datasets, and CI reliability
• Quality standards and release criteria
• Working directly with Engineering and Product to make complex systems testableThe stack includes:TypeScript · Playwright · API automation · CI/CD · Load & stress testingWe’re looking for someone with:
• 5+ years of QA experience, ideally in fintech or complex web products
• Strong JavaScript / TypeScript skills
• Deep API testing experience
• Experience testing transactional or financial systems
• A strong understanding of execution, liquidity, slippage, routing, and fees
• The instinct to think about what breaks before users find out
• Candidates already located in Japan, with Japanese communication skill a strong plus
• Experience working at popular local or big tech companies (e.g: Mercari, Line, Smartnews, Indeed, Amazon, Google etc.)Bonus: Web3/blockchain experience, AI-assisted development (Cursor, Copilot, Claude, etc.), or startup/scale-up experience.Available perks: Fully remote & full-flex Unlimited PTO Stock optionsGlobal-market compensationBest-in-class tooling & AI agentsAnnual global workations & team off-sitesIf you’re a frontend engineer who wants ownership, autonomy, and the chance to build at the edge of Web3, we’d love to hear from you.Apply now — discreetly.