Senior Automation Tester in Java

We are seeking aSenior Automation Tester in Java to define and lead the test automation strategy for our squad, ensuring high-confidence releases across backend services, integrations and UI flows. The role involves hands-on building and maintaining automated test suites, mentoring functional QAs to adopt automation practices, and promoting quality engineering best practices across the delivery lifecycle.

Responsibilities

• Own and evolve the squad's test automation strategy, including test pyramid, automation coverage targets, risk-based approach, and quality gates
• Define and enforce Definition of Done quality criteria, covering automation expectations, regression scope, and non-functional checks
• Establish and monitor quality KPIs such as automation pass rate, flaky tests, defect leakage, and trend reporting
• Design, implement, and maintain automated tests for RESTful APIs, executed with JUnit
• Validate API contracts, versioning, backward compatibility, negative/error scenarios, and authorization patterns
• Create robust integration test coverage for microservices and integration flows, including retries, error handling, and data consistency
• Validate persistence and data integrity using SQL against Microsoft SQL Server
• Implement and maintain reliable UI automation for critical user journeys
• Debug API/UI interaction issues in collaboration with engineers
• Design and execute performance/load tests, including workload models, baselines, and throughput/latency measurements
• Integrate automated suites into CI/CD pipelines and improve reliability and speed through parallelization and test selection strategies
• Mentor functional QAs to adopt automation through pairing, code reviews, training sessions, and clear contribution paths

Requirements

• 5+ years of proven experience as an Automation QA, including ownership of automation delivery in a squad/team
• Strong skills in Java test automation using JUnit
• Strong experience in API automation with RestAssured or Karate
• Experience in UI automation with Playwright and CI execution best practices
• Performance testing experience using Apache JMeter, including test plans, execution, and analysis
• Experience with Git and Azure DevOps for CI/CD, including pipeline integration, gating, and reporting
• Solid SQL skills and experience validating data in Microsoft SQL Server
• Strong mentoring and collaboration skills, with the ability to raise QA maturity across functional and technical testing
• English proficiency at B2 level or higher
• Fluency in Greek

Nice to have

• Familiarity with Agile methodologies
• Experience with Azure DevOps
• Background in Quality Architecture
• Proficiency in REST Assured