Position Summary:

We're looking for a strong Senior QA Engineer with leadership experience — someone who can not only design and maintain automated testing for backend and data-heavy systems in the blockchain domain, but also shape the team's technical vision, influence architectural decisions, and own product quality on a long-term basis.

This is a fully remote role, and we welcome applications from anywhere in Europe.

More details: crystalintelligence.com

Duties and responsibilities:

• Design, develop, and maintain automated tests for backend/API and frontend services and data-processing systems in the blockchain domain, including API, integration, contract, and data validation coverage
• Create reliable test coverage for edge cases such as missing data, delayed data, and incorrect calculations
• Analyze failed tests and production-like issues using logs, metrics, monitoring dashboards, API responses
• Conduct code reviews
• Pioneer new approaches, architectures, or frameworks that drive the business forward
• Focus on long-term systemic planning, making high-level trade-offs across projects, and establishing technical vision
• Prioritize testing efforts based on business needs, project risks, and delivery timelines
• Identify process improvement opportunities and implement QA best practices
• Evaluate and drive adoption of AI tools for QA and development workflows (e.g., AI-assisted test generation, code review, automation frameworks)
• Define best practices and guidelines for using AI tools within the QA process, and help the team integrate them effectively
• Collaborate closely with developers, business stakeholders, and cross-functional teams to improve testability, observability, and reliability of services
• Maintain test documentation, automation coverage notes, and clear defect reports