Senior Test Engineer-QA (UI & API)

Expected, C#, Docker, Jenkins, Git, Jira/XRay

Optional, RabbitMQ

About the project, We’re looking for a curious, impact-driven engineer who is passionate about performance, scalability, and engineering quality., , In this role, you won’t just “test” systems—you’ll shape how they perform in the real world. You’ll design intelligent performance strategies, build automation, and partner closely with developers to ensure our applications are fast, resilient, and delightful to use at any scale., , If you enjoy digging into bottlenecks, working across UI and APIs, and building tools that make engineering teams stronger, this role is for you., , Location: Hybrid model is possible (minimum 3 days in Katowice office per week).

Your responsibilities, Driving performance quality by designing and executing UI and API performance testing strategies, including load and stress testing., Building scalable, reusable automation frameworks and scripts that simulate real-world user behavior., Analyzing performance metrics to identify bottlenecks and support data-driven engineering decisions., Embedding performance testing into CI/CD pipelines to ensure continuous quality and delivery., Defining test data strategies and ensuring systems are observable, stable, and scalable., Elevating quality standards through KPI monitoring and continuous improvement of engineering practices., Reviewing code and sharing best practices to improve system quality, testability, and maintainability., Coaching and collaborating with teams to foster a quality-first engineering culture., Owning issue resolution through triage, root cause analysis, and implementation of sustainable fixes., Maintaining clear, up-to-date documentation, knowledge bases, and operational playbooks., Innovating with AI-driven approaches for test generation, anomaly detection, and intelligent regression testing., Driving continuous improvement of performance engineering tools, processes, and methodologies.

Experience (3+ years) in software engineering or test automation, with a strong automation mindset, Solid coding skills in C# (or similar modern language), A proactive approach—you enjoy designing solutions, not just executing tasks, Performance testing tools (e.g., JMeter or similar), UI automation frameworks (e.g., Playwright, Selenium, Selenoid), CI/CD and engineering tools (Docker, Jenkins, Git, Jira/XRay), Working across Windows & Linux environments, Understand modern software testing and Agile delivery, Can clearly communicate ideas and document your work, Good English communication skills.

Optional, Experience with AI in testing (e.g., GitHub Copilot, MCP concepts), Familiarity with Elastic Stack or messaging systems (RabbitMQ), Exposure to hardware simulation or end-to-end system testing

What we offer, Contract of Employment, Private Medical Care, Cafeteria Program, Multisport Card, Life Insurance, Hybrid Work Model (if applicable), 26 Days Annual Leave Regardless of Seniority, Learning & Development (8,000+ Trainings), Career Growth Opportunities, International & Multicultural Environment, Foreign Language Use, Employee Assistance Program, Employee Referral Program, Supportive & Inclusive Culture

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.