AI Security Researcher/Research Engineer

**AI Security Researcher / Research Engineer** **Remote or hybrid - London preferred but North America, EU, UK accepted** ### **About Brave:** Brave is on a mission to protect the human right to privacy online. We’ve built a free web browser that blocks creepy ads and trackers by default, a private search engine with a *truly* independent index, private AI assistant, latest privacy and security features, and a private ad network (opt-in!) that directly rewards you for your attention. Already over 120 million people regularly use Brave for a faster, more private web. Millions more switch every month. The internet is a sea of ads, hackers, and echo chambers. Big Tech makes huge profits off our data, and tells us what’s true and what’s not. Brave is fighting back. Join us! ### **Summary** We are looking for a researcher/research engineer to help mitigate the security risks that come with building AI systems-especially LLM-powered web agents and chatbots. In this role, you'll design and implement secure-by-design architectures, audit our LLM-powered web agent () and chatbot, and help set Brave's direction on how we identify, measure, and reduce security risk across AI products. ### **Responsibilities** - Design and execute adversarial evaluations to uncover failure modes in LLM-powered web agents and chatbots (e.g., prompt injection, tool abuse, data exfiltration) - Analyze model behavior (including internal thoughts) to understand and forecast security risks in frontier models - Develop and prototype security-focused training and fine-tuning techniques - Augment web agents with security principles including information flow control, privilege control and contextual security - Partner with engineers and (privacy, ML, and Cryptographic) researchers to translate findings into product changes, tests, and measurable security improvements - Help define a forward-looking security strategy and policy for building and responsibly releasing web agents—advocating for user protection ### **You may be a good fit if you have** - Demonstrated experience working on Secure AI (prompt injection attacks and security guardrails) - Strong publication record in AI security, ML security, or closely related areas - A track record of shipping products and features inside a fast-moving environment - Strong coding skills in Python and familiarity with ML frameworks like PyTorch or JAX - Experience training, fine-tuning, and evaluating large language models - Deep familiarity with large language models and web agents, how they work, and how they are trained - Experience applying security principles (e.g., information flow control, access control/least privilege) - Demonstrated success in bringing clarity and ownership to ambiguous technical problems - A Ph.D. in computer science is highly preferred, but we may consider some exceptions with industry experience ### **Skills That Will Set You Apart from the Competition** - Knowledge of AI Systems (pipelines, security evaluation, etc.) - Open source projects on security/privacy - Experience with confidential computing and ZKP/SMPC protocols - Ph.D. in computer science from a top-tier school - A strong publication record in premier systems, performance, or ML - Work experience in industry is desirable ### **Working at Brave - What we offer** - Ability to work at an exciting and well-funded international startup headquartered in San Francisco - Cutting-edge technology, allowing you to work with state-of-the-art tools and software solutions - Competitive compensation and plenty of room for personal growth - Great international exposure and team atmosphere We are looking to hire in London but would *consider* an exceptional candidate in the rest of Europe. NO AGENCIES or RECRUITERS PLEASE - Unfortunately, we cannot work with third parties on these searches.