This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior QA Analyst / Tester based in United States. The Senior QA Analyst / Tester will play a critical role in identifying vulnerabilities and security risks across advanced AI systems.You will design and execute adversarial testing campaigns across large language models, multimodal systems, and autonomous agents.The role combines AI security, offensive testing, red teaming, software engineering, and quality assurance in a highly technical environment.You will investigate attack vectors, prompt injection techniques, jailbreaks, harmful outputs, and other unintended model behaviors.Working closely with security, development, and engineering teams, you will turn testing findings into actionable remediation recommendations.You will also help strengthen evaluation frameworks, adversarial datasets, benchmarks, and standardized testing processes as AI threats continue to evolve.This is an opportunity for an experienced security professional to make a direct impact on the reliability, safety, and resilience of emerging AI technologies.