Senior QA Automation Engineer (AQA/SDET)

<p><strong>Position Summary:</strong></p><p>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.</p><p>This is a fully remote role, and we welcome applications from anywhere in Europe.</p><p>More details:<span> </span><a target="_blank" href="http://crystalintelligence.com">crystalintelligence.com</a><br><br><strong>Duties and responsibilities:</strong></p><ul><li><p>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</p></li><li><p>Create reliable test coverage for edge cases such as missing data, delayed data, and incorrect calculations</p></li><li><p>Analyze failed tests and production-like issues using logs, metrics, monitoring dashboards, API responses</p></li><li><p>Conduct code reviews</p></li><li><p>Pioneer new approaches, architectures, or frameworks that drive the business forward</p></li><li><p>Focus on long-term systemic planning, making high-level trade-offs across projects, and establishing technical vision</p></li><li><p>Prioritize testing efforts based on business needs, project risks, and delivery timelines</p></li><li><p>Identify process improvement opportunities and implement QA best practices</p></li><li><p>Evaluate and drive adoption of AI tools for QA and development workflows (e.g., AI-assisted test generation, code review, automation frameworks)</p></li><li><p>Define best practices and guidelines for using AI tools within the QA process, and help the team integrate them effectively</p></li><li><p>Collaborate closely with developers, business stakeholders, and cross-functional teams to improve testability, observability, and reliability of services</p></li><li><p>Maintain test documentation, automation coverage notes, and clear defect reports</p></li></ul><p><br><strong>Required:</strong></p><ul><li><p>5+ years of AQA/SDET experience testing complex backend, API, data-heavy, or distributed systems</p></li><li><p>Deep understanding of SOLID principles and design patterns, hands-on experience applying them into test frameworks;</p></li><li><p>Solid SQL and PostgreSQL experience, including advanced queries, data validation, and investigation of data inconsistencies</p></li><li><p>Strong test design skills</p></li><li><p>Understanding of backend architecture, environment-based configuration, service health checks, and deployment validation</p></li><li><p>Strong Java programming skills for test automation</p></li><li><p>Hands-on experience with test automation tools and frameworks (e.g., Playwright, Postman, REST-assured or similar for API testing; Allure for reporting)</p></li><li><p>Experience of working with version control systems (GIT);</p></li><li><p>Experience working in Scrum or another Agile delivery process</p></li><li><p>Hands-on experience with AI-assisted development tools such as Cursor and Claude, including creating custom skills, agents, and rules to support QA/development workflows</p></li><li><p>Hands-on experience with AI no-code tools and business process automation (e.g., n8n)</p></li><li><p><span>Proficiency in English</span></p></li></ul><p><br><strong>Would be a plus:</strong></p><ul><li><p>QA technical leadership experience</p></li><li><p>Experience in performance testing</p></li><li><p>Python knowledge</p></li></ul><p><br><strong>Tech stack:</strong></p><ul><li><p><strong>Languages:</strong> Java (primary, for test automation); Python (nice to have, such as backend is written on this language)</p></li><li><p><strong>Database:</strong> PostgreSQL</p></li><li><p><strong>Test automation:</strong> Playwright, Postman or REST-assured (API testing), Allure (reporting)</p></li><li><p><strong>CI/CD:</strong> GitHub Actions</p></li><li><p><strong>AI &amp; Automation Tooling: </strong>Cursor or Claude for AI-assisted development, n8n for workflow automation (e.g., Jira ticket automation, bug-report pipelines)</p></li><li><p><strong>Project &amp; Collaboration Tools: </strong>Jira, ClickHouse, Mintlify, Drata (compliance tooling), Spira (test case management), Tailscale</p></li></ul>