Senior Quality Assurance Engineer (Trading)

In partnership with SBI Group, we are building a next-generation decentralized exchange (DEX) aimed at bringing the majority of Japanese equities on-chain. Our goal is to create a secure, transparent, and high-performance trading infrastructure capable of supporting institutional volumes while remaining accessible to retail participants. The platform features a fully on-chain order book and is powered by a custom state transition function and consensus layer, purpose-built for low-latency, high-throughput trading.

As the Senior QA Engineer, you will be the quality champion for this system and cover core trading flows, order book behavior, matching logic, and backend services powering execution. As the first senior-level QA on the team, you will own the end-to-end quality strategy with a strong emphasis on automation, ensuring the correctness, reliability, and performance of both API and E2E layers under real-world trading conditions.

This is a hands-on role focused on building robust E2E and API test coverage, not manual testing.

• →

• 3+ years in QA for web or fintech products, with at least 2+ years focused on test automation and E2E testing.
• Strong experience building and maintaining E2E test frameworks (e.g. Playwright, Cypress, or similar).
• Solid experience in API testing and automation (REST, JSON-RPC, or similar).
• Strong JavaScript/TypeScript skills.
• Experience testing complex transactional or financial systems.
• Good understanding of trading concepts: slippage, liquidity, routing paths, execution flow.
• Experience designing stable, maintainable automated test suites (CI integration, flakiness reduction).

• Experience testing DEXs, trading platforms, or financial systems.
• Familiarity with blockchain basics, smart contracts, and on-chain transaction flows.
• Understanding of AMMs, liquidity pools, and routing algorithms.
• Experience with performance/API load testing tools (e.g. k6, Artillery).
• Experience using AI tools to improve test generation and coverage.