Browser - Vulnerability Researcher

Job description

You will join an established offensive-security organisation with a large team of senior and principal-level vulnerability researchers and exploit developers. Our browser research is focused on producing working exploit capability — not just crashes, reports or theoretical attack paths. This role is for a researcher who has already found and exploited vulnerabilities in production browsers. You should be comfortable owning the full path from attack-surface selection and root-cause analysis to reliable primitives, exploitability decisions and clean technical handover. **What you’ll work on** - Renderer-reachable attack surfaces in Chromium, with room to work on WebKit or Firefox where relevant. - Memory-corruption and logic vulnerabilities in V8, Blink, WebAssembly, DOM bindings, parsers, media, graphics and adjacent C/C++ components. - Exploitation under modern constraints including pointer compression, heap isolation, control-flow protections and the V8 Sandbox (formerly commonly referred to as the Ubercage). - Variant analysis, patch diffing and adjacent-code research rather than stopping after a single bug. - Collaboration with sandbox, platform and kernel researchers when a renderer issue is part of a larger chain. **What you’ll deliver** - Original browser vulnerabilities with a clear root cause and reliable reproduction. - Working exploit primitives or chain components that survive realistic release-build mitigations. - Minimised test cases, exploitability analysis, affected-version notes and reproducible research environments. - Readable exploit code and technical documentation that another senior researcher can pick up and extend. - Tooling that improves fuzzing, instrumentation, crash triage, variant hunting or exploit-development speed. **What we’re looking for** - A proven record of delivering browser vulnerabilities or exploit components against modern browser releases. - Deep practical knowledge of Chromium internals, ideally including both the renderer and V8. - Strong C/C++ debugging, reverse engineering and source-audit skills. - Hands-on experience turning use-after-free, type confusion, out-of-bounds access or related bug classes into useful primitives. - A real understanding of the V8 Sandbox security model and how it changes exploitation strategy. - The judgement to distinguish an interesting crash from a chainable, operationally meaningful vulnerability. - The ability to work independently and finish difficult research without constant direction. **Strong signals** - Browser CVEs, Pwn2Own-level work or comparable real-world exploit delivery. - Experience with custom browser builds, sanitizers, source instrumentation and targeted fuzzing harnesses. - Exploit-chain work across Android, iOS, macOS, Windows or Linux. - Research on JITs, garbage-collected heaps, cross-language ownership. - A history of raising the technical level of other experienced researchers. **How we work** - Fully remote, with high autonomy and direct access to other senior researchers and exploit developers. - We care about completed, reproducible technical delivery. - Public credits are useful but not required.