1&1 | Germany | 63xxx, 56xxx, 76xxx, 40xxx Karlsruhe, Frankfurt, Montabaur | Permanent position | Full time / Home office | Published since: 28.05.2026 on stepstone.de
AI Penetration Tester / AI Security Specialist (m/f/d)
1&1 is one of the leading telecommunications providers in Germany with over 3,100 employees and nearly 16 million customer contracts. With pioneering spirit, unusual ideas and creative teams, we have won a leading market position in mobile and broadband connections. By combining the over 67,000 km long 1&1 fiber optic network and regional networks, we create Germany's most extensive fiber optic network. We also build the most modern 5G network in Europe, based on the new Open-RAN technology. With open interfaces and 5G functions in a powerful cloud infrastructure. Continue the 1&1 success story by designing the future through the deployment and development of innovative technologies. Be part of 1&1. .
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Your tasks • Your profile • What we offer
In this role, you take a key role in securing modern AI and GenAI systems and actively contribute to identifying and troubleshooting vulnerabilities at an early stage. performing penetration tests on AI/GenAI systems (e.g. LLM applications, RAG systems, AI agents) Simulation of realistic attack scenarios such as Prompt Injection, Jailbreaks, Data Leakage, Model manipulation and retrieval attacks Identification, analysis and documentation of vulnerabilities along the entire AI cycle Development and implementation of security measures (e.g. Guardrails, input/output filtering, access controls) Support in building safe AI architectures as defined by “Secure AI by Design” Close cooperation with AI/ML Engineers to integrate security into development processes Construction and development of AI-specific pentest methods, playbooks and test frameworks Development of automated security tests (e.g. Red Teaming, Adversarial Testing) Implementation of security assessments, reviews and audit reports and risk assessments Advising development teams on AI security best practices, training and workshops
Successfully completed studies, e.g. in computer science, IT security, cyber security or a comparable degree programme Multiannual experience in IT security, penetration testing or offensive security Knowledge of web and API security (e.g. OWASP Top 10) Understanding modern AI/GenAI systems (e.g. LLMs, RAG, API-based architectures) Experience in Security Testing, Vulnerability Analysis and Exploitation as well as good programming skills (e.g. Python) for the automation of tests Analytical thinking and the ability to translate into attacker perspectives Experience in the field of AI Security, LLM Security or Red Teaming Knowledge of relevant frameworks (e.g. OWASP Top 10 for LLM Applications, NIST AI RMF) Experience with Adversarial Machine Learning Knowledge of cloud security (e.g. AWS, Azure) Experience in regulated industries (e.g. telecommunications, finance)
- Attractive salary
- Strong community of team players
- Working hours of confidence with flexible classification and the possibility of working up to 40% mobile
- Numerous training options on- and offline
- Discounts on 1&1 products and for various leisure activities
- In-house restaurant
- Free drinks and fresh fruit
- Jobrad grant
Location
 | 1&1 | |
| Karlsruhe, Frankfurt, Montabaur | ||
| Germany |
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