AI Researcher for AI Stack Security

Pracovní nabídka

You will become part of the newly established AI Threat Research and AI Conversation Security team within the Technology Division in Bratislava. As one of the founding members, you have a unique opportunity to shape the team's direction and methodology from the ground up.

The team researches attacks against conversational AI systems, probing and breaking them to understand how adversaries exploit large language models. Beyond research, the team designs and implements detection mechanisms and translates these defenses into shipping products across endpoint, cloud, and standalone form factors.

As an Experienced AI Researcher, you research, train, and optimize the language models that detect attacks on conversational AI. Beyond core model work, you carry models from early experiments to deployment-ready detectors that run within strict performance budgets across endpoint and cloud environments.

About the Role

• Research and prototype specialized language model detectors for malicious prompts and attempts to manipulate conversational AI, turning adversarial research findings into model designs.
• Train and fine-tune small language models for detection tasks, from dataset preparation through experimentation to production handoff.
• Distill large models into compact, specialized detectors that balance detection quality against strict latency and memory budgets.
• Optimize inference performance through quantization, pruning, and architecture trade-offs, keeping detection real-time even on endpoint hardware.
• Evaluate detector performance across diverse conversation datasets, measuring detection quality, robustness, and false-positive rates.
• Track state-of-the-art research in language model security and efficiency, deciding which advances are worth adopting.
• Collaborate with security researchers and product engineers to deploy detectors across endpoint, cloud, and standalone form factors.

Essential Requirements

• Deep understanding of how large language models work internally — transformer architectures, attention mechanisms, and the trade-offs behind their performance and cost.
• Experience training and fine-tuning language models, from dataset preparation to experiment design.
• Hands-on experience with model distillation, turning large models into compact detectors that preserve quality.
• Experience with inference performance optimization, including quantization and pruning for latency- and memory-constrained environments.
• Rigorous approach to model evaluation, measuring quality, robustness, and false-positive behavior.
• Proficiency in Python and its AI/ML ecosystem.
• Strong drive for continuous learning and staying current with state-of-the-art research.

Desirable Requirements

• University degree in Machine Learning, Computer Science, Mathematics, or a related technical field.
• Background in cybersecurity, threat research, or adversarial machine learning.
• Experience running models on endpoint or embedded hardware.

Technologies

Python, PyTorch, Hugging Face, scikit-learn, PEFT, bitsandbytes, ONNX, Docker, Git, JIRA, Confluence

Benefits

• Support in personal and professional development - opportunities to attend various trainings, courses, conferences or meetups
• Attractive financial bonus paid twice a year based on your performance
• Financial support in case of life milestones (wedding, childbirth)
• Complementary retirement savings contributions
• Fully covered 170 CZK/per day meal vouchers
• Transportation benefit
• Refer a friend" benefit - the opportunity to receive a financial bonus when referring a friend for an open vacancy
• Available home-office or remore work
• Fully-paid 3 sickdays
• Mind’n’Soul Program - free helpline and counselling in personal and professional development
• Sport activities support
• Fresh fruit, tea, coffee, non-alcoholic beverages - you can find them all in every kitchen
• Casual, friendly, open culture with no dress code
• Participating in company events
• Opportunity to use company common areas (terrace, relax zone, library) for a chill time and meetings with colleagues
• Volunteering and opportunity to participate in various CSR activities
• Loyalty program - extra vacation days and financial bonus after working at ESET for 5 and more years