AI Test Engineer (m/f/d)

Company Description

 

Job Description

As a Customer Service Agentic 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

• Generous Time Off Enjoy 28 days of vacation, an additional day off for your birthday, and 1 volunteer day per year
• Work-Life Balance & Flexibility Benefit from a hybrid working model, flexible working hours, and no dress code
• Great Employee Benefits Access discounts on SIXT rent, share, ride, and SIXT+, along with partner discounts
• Training & Development Participate in training programs, external conferences, and internal dev & tech talks designed for your personal growth and development
• Health & Well-being Private health insurance to support your well-being
• Additional Perks Enjoy the Coverflex advantage system to enhance your employee experience

Additional Information

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!