AI Security Researcher / Research Engineer
Remote or hybrid - London preferred
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

📌 AI Security Researcher/Research Engineer (España)
🏢 Brave
📍 España