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AI Security Researcher/Research Engineer at Brave. Location Information: . 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 (https://brave.com/blog/ai-browsing/) 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.