As a AI QA Engineer (m/f/d), you ensure that SIXT’s virtual agents and Generative-AI–powered workflows deliver reliable, safe, and delightful support across all customer service channels. You design and run intelligent test strategies for LLM- and agent-based systems, combining classic QA skills with a deep understanding of agentic automation, conversational AI, and customer service KPIs.

YOUR ROLE AT SIXT

• Design and execute end-to-end test plans for customer service virtual agents (voice, chat, email). Build and maintain agentic AI test suites validating autonomous workflows (e.g., booking changes, billing, damages).
• Define and monitor AI quality metrics such as resolution rate, deflection, CSAT, and safety violations. Develop test data and synthetic scenarios for edge cases, ambiguous queries, and multilingual requests.
• Evaluate agent behavior through reasoning traces, tool-use decisions, and memory usage.
• Implement and improve automated testing frameworks for conversational flows, APIs, and integrations. Contribute to LLMOps / CI/CD pipelines to automatically detect regressions.
• Perform bias, fairness, and safety testing in line with SIXT policies and regulatory expectations. Collaborate with cross-functional teams to refine requirements and acceptance criteria.
• Document defects, test results, and insights clearly for stakeholders.

YOUR SKILLS MATTER

• Foundations 2/ 3 years of experience in software QA / test engineering. Strong understanding of testing principles: functional, regression, integration, performance.
• AI Testing Hands-on experience testing AI or ML systems such as LLM chatbots or recommendation engines. Familiarity with key concepts of multi-agentic systems, agentic frameworks (e.g., LangChain), AWS AgentCore.
• Automation Scripting skills in Python and experience with REST API testing.
• LLMOps: Understanding of LLMOps / MLOps: versioning, monitoring, rollback strategies.
• Customer Focus Experience or interest in customer service processes and KPIs.
• Communication Excellent analytical, documentation, and communication skills. Fluency in English; German or additional languages a plus.

WHAT WE OFFER

• A Global Tech Hub in Lisbon Join a thriving international tech community and work alongside engineers, product experts, and business teams who turn ideas into real impact. Our hubs at Factory Lisboa in Beato and ARTs Lisboa in Parque das Nações are where great tech gets built

• Learning & Knowledge Exchange Level up through regular events with internal and external speakers. We value curiosity, continuous learning, and open exchange – across teams, disciplines, and borders

• Flexible Work Setup Two office days a week, flexible hours, and modern spaces built for both deep focus and team collaboration – work the way that brings out your best

• Time Off & Wellbeing Enjoy 28 vacation days per year, an additional day off on your birthday, one volunteer day annually, and private health insurance that also covers your spouse and children free of charge

• Practical Everyday Benefits Get a yearly Coverflex allowance and a daily meal allowance to make everyday life a little easier

• SIXT Perks Get exclusive rates on all SIXT services, with special discounts extended to your family and friends. Because great perks are even better when you can share them

About us:

We are a globally leading mobility service provider with a revenue of €4.00 billion and around 9,000 employees worldwide. Our mobility platform ONE combines our products SIXT rent (car rental), SIXT share (car sharing), SIXT ride (taxi, ride, and chauffeur services), and SIXT+ (car subscription), giving our customers access to our fleet of 350,000 vehicles, the services of 4,000 cooperation partners, and around 5 million drivers worldwide. Together with our franchise partners, we are present in more than 110 countries at 2,000 rental stations. At SIXT, top-tier customer experience and outstanding customer service are our highest priorities. We believe in true entrepreneurship and long-term stability and align our corporate strategy with foresight. Get started with us and apply now!