Senior Data Scientist - Cybersecurity

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Data Scientist - Cybersecurity based in Brazil. This role sits at the intersection of data science, natural language processing, and AI security, with a strong focus on building reliable machine learning solutions. You will work hands-on across data curation, model development, evaluation, optimization, and production deployment for AI security use cases. The position focuses on identifying risks in AI interactions, including sensitive-data exposure, unsafe content, adversarial inputs, and malicious prompts. You’ll work with transformer-based models and large language model technologies while developing high-quality datasets and rigorous evaluation frameworks. The role combines experimentation and practical production engineering, with particular attention to accuracy, robustness, latency, and efficiency. You’ll collaborate with AI and engineering teams to turn research and experimentation into scalable solutions that address evolving AI-related threats.