Senior Test Automation Engineer

About the Role:

We are looking for an experienced Senior Test Automation Engineer to join a cross-functional product team. In this role you will own the quality strategy across a modern, API-first product stack — designing test frameworks, driving CI/CD quality gates, and mentoring colleagues to raise the overall engineering bar. The split is approximately 30% front-end / 70% back-end testing.

What you will do:

• Plan and execute integration, system, and usability testing across the full product.
• Participate in end-to-end (E2E) and user acceptance testing (UAT) cycles.
• Collaborate closely with development teams to understand critical paths and maintain product stability.
• Build and maintain automated test frameworks for web, API, mobile, and performance testing.
• Drive CI/CD quality gates and own pipeline integration of test suites.
• Conduct code reviews and promote good programming practices within QA and Dev teams.
• Lead proof-of-concept and showcase activities when evaluating new tools and technologies.
• Mentor junior and mid-level engineers — sharing knowledge, reviewing work, and raising team standards.
• Foster a culture of quality and proactive problem-solving across engineering squads.

What we are looking for:

Minimum 5+ years of hands-on test automation experience.

Core technical skills:

• Proficiency in Java and/or JavaScript for test development.
• Strong expertise in Git and version control workflows.
• Hands-on experience with Postman for API testing and validation.
• Deep knowledge of CI/CD processes and tooling.
• Excellent understanding of API response structures and contract testing.

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• Experience with performance testing methodologies and execution.
• Solid grasp of SDLC across the full software delivery lifecycle.
• Strong command of programming best practices: SOLID, KISS, OOP, design patterns.
• Experience in code review and promoting development standards.
• Proven ability to evaluate and integrate new tools and technologies (POC, showcase).
• Familiarity with Jira; experience with X-ray plugin is a plus.

Automated testing toolchain:

Web front-end:

• Selenium / Selenide (primary web testing tool)
• Cypress (used by select teams)
• TestNG / JUnit
• Cucumber
• JMeter (nice to have)

API testing:

• REST Assured
• TestNG / JUnit
• Gatling (nice to have)

Mobile testing:

• Appium
• XCUI Test (for specific teams)

Performance:

• Gatling (lead performance tool in organisation)
• JMeter (nice to have)

Soft skills:

• English: B2–C1 (working proficiency required for daily collaboration).
• Clear and effective communication with both technical and non-technical stakeholders.
• Strong analytical and problem-solving skills.
• A genuine mentoring mindset — you enjoy helping others grow.
• Proactive approach: you surface issues early and propose solutions.
• Good planning, prioritisation, and the ability to handle context switching.
• Drive to champion technical innovation and continuous improvement.

What We Offer

• B2B contract
• Fully remote work with minimal required on-site presence - 1 day every two weeks on-site (Thursday) at the client's office in Warsaw.
• Additional on-site sessions 2–3 days every 2–3 months for planning and team alignment.
• Engagement in technically challenging projects with a mature engineering culture.