Senior Test Engineer

SEON is the command center for fraud prevention and AML compliance, helping thousands of companies worldwide stop fraud, reduce risk and protect revenue. Powered by 900+ real-time, first-party data signals, SEON enriches customer profiles, flags suspicious behavior and streamlines compliance workflows - all from one place. SEON provides richer data, more flexible and transparent analysis, and faster time to value than any other provider on the market. We’ve helped companies reduce fraud by 95% and achieve 32x ROI, and we’re growing fast, thanks to our partnerships with some of the world’s most ambitious digital brands like Revolut, Wise, and Bilt. ABOUT THE ROLE & THE TEAM: We are looking for a senior, hands-on Test Engineer whose primary strength is Python automation. You will own end-to-end quality for key product areas, build reliable automated coverage across our API and service layer, and raise the quality bar with every release. This is not a tests-only role. We need someone who can drive the right conversations, propose solutions, and help the team ship faster with confidence. You will be expected to write production-quality Python automation, lead test strategy decisions, and guide others in how we approach coverage and implementation. We are actively migrating our existing Python automation suite to Playwright. Familiarity with Playwright is a plus, and this person will play a meaningful role in that migration, but the immediate priority is deep Python expertise and strong API testing chops. This role is based in our Budapest office on a hybrid schedule WHAT YOU’LL DO: Act as a Quality Steward for critical backend services, APIs, and data flows, prioritizing test strategies based on customer impact and real-world risk rather than just arbitrary code coverage. Design, implement, and maintain automated test suites in Python, covering API, integration, and service-level testing. Lead automation design decisions: what to automate, where it sits in the test pyramid, and how to keep suites stable, fast, and maintainable. Build and improve our Python test framework with a focus on reliability, clarity, speed of execution, and ease of contribution. Partner with developers and product managers during the requirements and design phases to build testability into the system architecture before code is written, review test-related code including output from AI tooling, and guide unit and integration testing practices. Debug complex failures across environments by leveraging production telemetry (logs, metrics, and traces), ensuring we learn from real-world anomalies to continuously improve our automated coverage. Define and maintain CI/CD (Continuous Integration/Continuous Deployment) quality gates in GitHub, including how tests run, how failures are triaged, and what release-ready means. Develop practical test data strategies that support both automated and exploratory testing. Contribute to non-functional testing, specifically performance, reliability, and security-by-default (e.g., validating authorization boundaries, tenant isolation, and abuse paths)for critical services. Mentor other QA engineers and developers on Python automation best practices and day-to-day quality habits. Participate in the active migration of our Python automation suite to Playwright, contributing to framework decisions and implementation alongside the team. WHAT YOU’ll BRING: 4+ years of experience in QA automation or Test Engineering, with deep, hands-on Python automation development as your primary skill. Strong API testing experience: designing, building, and maintaining API test suites using Python-based frameworks (pytest, requests, httpx, or similar). Solid understanding of REST APIs, web services, and event-driven systems, including how to test with mocks, contracts, and controlled test data. Proven experience building and maintaining automation inside CI/CD pipelines, including test execution, reporting, and flaky test management in GitHub Actions or similar. Clean, reusable Python code with thoughtful design patterns and a focus on long-term maintainability. Confidence leading technical discussions on test strategy, coverage tradeoffs, and automation approach, including making and defending recommendations. Comfort using modern AI tools to multiply your velocity, treating AI-generated output as a starting point while applying rigorous engineering judgment and ownership to the end result. NICE TO HAVE: Playwright experience or genuine interest in learning it. We are actively migrating our Python suite and this person will be part of that work. Contract testing experience using Pact or similar tools. Performance testing experience, k6 preferred. Docker and cloud-native familiarity, plus experience working with microservices architectures. Test management and traceability experience using tools like TestRail, Testmo, or similar, alongside documentation habits in Confluence or Coda. WHY YOU"LL LOVE IT HERE: Real ownership of end-to-end quality and the ability to shape how we test and ship software. A collaborative engineering culture where QA is treated as engineering, not an afterthought. Modern tooling, room to experiment, and the expectation that your ideas will influence how we work. SEON Technologies collects and processes personal data in accordance with applicable data protection laws. If you are a European Job Applicant see the privacy notice for further details. SEON is an equal opportunity employer. We strive to embrace what makes each one of us unique; we each have our own story. Whether looking at our current staff or future team members, we believe that everyone has something to contribute, and our employment practices reflect that. We do not make an employment decision based upon race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. Please let your recruiter know if you need reasonable adjustments to our recruitment process.