Senior QA Automation Engineer (AQA/SDET)

Crystal Intelligence; Kraków; Remote; PLN 306,000 - 481,000; Full time

Job summary

Crystal Intelligence is seeking a Senior QA Engineer with leadership experience to shape the team's technical vision and own product quality long-term. You will design and maintain automated tests for backend/API and data-heavy blockchain systems, while driving architectural decisions and QA strategy.

This fully remote role welcomes applicants from anywhere in Europe. You will collaborate with developers and stakeholders, establish QA best practices, and explore AI-assisted testing to improve

Qualifications

• 5+ years of AQA/SDET experience testing complex backend, API, data-heavy, or distributed systems.
• Strong Java programming skills for test automation.
• Hands-on experience with Playwright, API testing tools, and Allure for reporting.
• Solid SQL and PostgreSQL experience for data validation and investigation of inconsistencies.
• Experience with CI/CD workflows, Git version control, and Agile delivery.
• Knowledge of AI-assisted QA tools and automation approaches is a plus.

Responsibilities

• Design, develop, and maintain automated tests for backend/API and frontend services in a blockchain domain.
• Create reliable test coverage for edge cases like missing data or delayed data.
• Analyze failed tests and production-like issues using logs and metrics.
• Conduct code reviews and propose architectural improvements.
• Pioneer new approaches, architectures, or frameworks to drive the business forward.
• Focus on long-term systemic planning and high-level trade-offs across projects.
• Prioritize testing efforts based on risk and delivery timelines.
• Identify process improvement opportunities and implement QA best practices.
• Evaluate and drive adoption of AI tools for QA and development workflows.
• Define best practices for using AI tools within QA.
• Collaborate with developers and stakeholders to improve testability and observability.
• Maintain test documentation and clear defect reports.

Skills

AQA/SDET experience

Java programming

Test design

English proficiency

System analysis

AI-assisted QA

Tools

Playwright

Postman

REST‑assured

Allure

Git

Job description

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

Required:

• 5+ years of AQA/SDET experience testing complex backend, API, data-heavy, or distributed systems




• Deep understanding of SOLID principles and design patterns, hands‑on experience applying them into test frameworks;




• Solid SQL and PostgreSQL experience, including advanced queries, data validation, and investigation of data inconsistencies




• Strong test design skills




• Understanding of backend architecture, environment‑based configuration, service health checks, and deployment validation




• Strong Java programming skills for test automation




• Hands‑on experience with test automation tools and frameworks (e.g., Playwright, Postman, REST‑assured or similar for API testing; Allure for reporting)




• Experience of working with version control systems (GIT);




• Experience working in Scrum or another Agile delivery process




• 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




• Hands‑on experience with AI no‑code tools and business process automation (e.g., n8n)




• Proficiency in English

Would be a plus:

• QA technical leadership experience




• Experience in performance testing




• Python knowledge

Tech stack:

• Languages: Java (primary, for test automation); Python (nice to have, such as backend is written on this language)




• Database: PostgreSQL




• Test automation: Playwright, Postman or REST‑assured (API testing), Allure (reporting)




• CI/CD: GitHub Actions




• AI & Automation Tooling: Cursor or Claude for AI‑assisted development, n8n for workflow automation (e.g., Jira ticket automation, bug‑report pipelines)




• Project & Collaboration Tools: Jira, ClickHouse, Mintlify, Drata (compliance tooling), Spira (test case management), Tailscale