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Test Performance Engineer - QA (UI & API Testing) Miejsce pracy: Katowice Technologies we use Expected C# Docker Jenkins Git Jira Xray Selenium Visual Studio Optional RabbitMQ Operating system Windows Linux About the project We are seeking a skilled developer with expertise in UI and API performance testing to ensure our applications deliver optimal speed, scalability, and reliability. This role involves designing, implementing, and executing performance tests, analyzing results, and collaborating with development teams to optimize application performance across both front-end and back-end components Location: Katowice Office (3 days per week) Your responsibilities Contribute to performance (e.g., smoke/load scripts). Develop automated performance test scripts, simulate real-world usage scenarios for UI and API endpoints under varying loads. Collect and analyze performance metrics and identify bottlenecks for front-end and API. CI/CD Integration: Integrate test suites into pipelines. Support deterministic test data strategies and ensure environment readiness and observability. Support tracking quality KPIs (coverage by critical path, defect escape rate) and drive continuous improvements. Review automation code, enforce standards, and mentor engineers on testability, patterns, and best practices. Triage failures, perform root cause analysis, and collaborate to prevent recurrence via guardrails and automation. Maintain living documentation for test strategy, frameworks, environments, and runbooks. Implementing AI-based solutions for test generation, coverage analysis, anomaly detection, and regression optimization. Our requirements Self-driven person with the ability to design and implement performance test scenarios and turn them into automated load and stress tests Minimum 3 years experience in test automation or software engineering with a strong automation focus Knowledge of a modern programming language (C#) Hands-on experience with: Docker, Jenkins, Git, JIRA/X-Ray JMeter or comparable Performance Testing Tool Selenium/Selenoid or comparable Test Automation Framework (eg. Playwright) Windows and Linux Operating Systems (admin tools e.g. Microsoft Visual Studio, SQL Management Studio, installation scripts etc) Detailed understanding of software testing principles and Agile development process Ability to writing technical documentation Good English communication skills (speaking and writing) and ability to work in international teams Optional Experience in using AI in the testing process, e.g. Github CoPilot (including concept of MCP’s). Elastic stack RabbitMQ Experience with integrating HW simulation with E2E testing What we offer Contract of employment Cafeteria Program Over 8000 industry recognized trainings Various options of development Being part of a multicultural team Possibility to use foreign languages on a daily basis Teamworking and supportive atmosphere in our teams Life insurance, Private medical care, Sport card, 26 days of holiday regardless seniority, Employee referral programme. Benefits sharing the costs of sports activities private medical care life insurance employee referral program Diebold Nixdorf Expect more. Connect more. Be more at Diebold Nixdorf. Our teams automate, digitize, and transform the way more than 75 million people around the globe bank and shop in this hyper-connected, consumer-centric world. Join us in connecting people to commerce in this vital, rewarding role.